Source: http://rpm.rcabc.org/index.php?title=Draft_Template:Part_3_(Waterproofing_Roofs)&diff=25204&oldid=24840
Timestamp: 2020-07-16 02:46:43
Document Index: 267255682

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Revision as of 20:29, 18 June 2020 (view source)
:;''CSA Standard'' (“the Standard”): means the ''CSA Standard A123.21 Standard test method for the dynamic wind uplift resistance of membrane-roofing systems'' (latest edition).
:;''Ballast'', when used in this ''Manual'': refers to a material used for securing the roof assembly. When gravel or pavers are used in this way, they are considered part of the roof system.
:;''Ballast'', when used in this ''Manual'': refers to a material used for securing the ''roof system''. When gravel or pavers are used in this way, they are considered part of the ''roof system''.
:;''Overburden'': is any material, structure or item of equipment that is placed on top of the completed roof. Gravel or pavers are considered to be overburden when they do not serve to secure the roof system. See also '''14.1.1 Definitions'''.
:;''Overburden'': is any material, structure or item of equipment that is placed on top of the completed roof. Gravel or pavers are considered to be overburden when they do not serve to secure the ''roof system''. See also '''14.1.1 Definitions'''.
Wind that compromises the membrane of a waterproofing roof assembly often results in leaks, sometimes with catastrophic consequences. Therefore, the ''Design Authority'' must pay attention to the design of the roof and its performance under windy conditions.<br>
Wind that compromises a membrane roof ''Waterproofing System'' often results in leaks, sometimes with catastrophic consequences. Therefore, the ''Design Authority'' must pay attention to the design of the roof and its performance under windy conditions.<br>
'''Conventionally Insulated Roof Assemblies''' are governed by standards adopted in this ''Manual'' from the ''National Building Code of Canada'' (NBCC) and the ''British Columbia Building Code'' (BCBC). The BCBC requires the proper calculation of ''Specified Wind Loads'', and securement of the roof components using a ''Tested Assembly'' or, in the alternative, either an ''Assembly with Proven Past Performance'' or an assembly that is otherwise engineered to resist the ''Specified Wind Loads'' of a roof. '''''RoofStar Guarantee Standards''''' require these same measures for new or fully replaced conventionally insulated roof assemblies, in order to ensure the roof assembly is not compromised by wind that could, as a consequence, cause leaks. In addition, this section sets out the requirements for
'''Conventionally Insulated Roof Systems''' are governed by standards adopted in this ''Manual'' from the ''National Building Code of Canada'' (NBCC) and the ''British Columbia Building Code''. The ''British Columbia Building Code'' requires the proper calculation of ''Specified Wind Loads'', and securement of the roof components using a ''Tested Assembly'' or, in the alternative, either an ''Assembly with Proven Past Performance'' or an assembly that is otherwise engineered to resist the ''Specified Wind Loads'' of a roof. '''''RoofStar Guarantee Standards''''' require these same measures for new or fully replaced ''Conventionally Insulated Systems'', in order to ensure the ''roof system'' is not compromised by wind that could, as a consequence, cause leaks. In addition, this section sets out the requirements for
#material substitution (applicable to ''Tested Assemblies'' or assemblies with proven past performance).
#fastener and adhesive application (minimum numbers and spacing).
#roofs installed with overburden, ''Protected Membrane Roof Assemblies'', and roofs where only part of the system must be replaced.
#roofs installed with overburden, ''Protected Membrane RoofSystems'', and roofs where only part of the ''system'' must be replaced.
''Protected'' and ''Modified Protected Membrane Roof Assemblies'', and uninsulated roof assemblies (with or without ballast) must be designed to resist the calculated ''Specified Wind Loads'', but their securement cannot be determined with the use of a ''Tested Assembly'' report, which pertains only to conventionally insulated systems. Rather, the Design Authority must refer to other resources to determine how to secure the roof against negative wind pressures. Some of those resources may be found in this Part.
''Protected'' and ''Modified Protected Membrane Roof Assemblies'', and uninsulated roof assemblies (with or without ballast) must be designed to resist the calculated ''Specified Wind Loads'', but their securement cannot be determined with the use of a ''Tested Assembly'' report, which pertains only to ''Conventionally Insulated Systems''. Rather, the ''Design Authority'' must refer to other resources to determine how to secure the roof against negative wind pressures. Some of those resources may be found in this Part.
Where a '''''RoofStar 15-year (Waterproofing Roof) Guarantee''''' is specified, and enhanced roof system securement is required by the membrane manufacturer in order to meet their system warranty requirements (enhanced securement may exceed the securement required in a ''Tested Assembly'', an ''Assembly with Proven Past Performance'' or a custom-engineered securement), the higher securement requirements must be complied with in the design and construction of the Project. See also '''1.3.1 RoofStar 15-Year Guarantee''' for further general requirements.
Where a '''''RoofStar 15-year (Waterproofing Roof) Guarantee''''' is specified, and enhanced ''roof system'' securement is required by the membrane manufacturer in order to meet their system warranty requirements (enhanced securement may exceed the securement required in a ''Tested Assembly'', an ''Assembly with Proven Past Performance'' or a custom-engineered securement), the higher securement requirements must be complied with in the design and construction of the ''Project''. See also '''1.3.1 RoofStar 15-Year Guarantee''' for further general requirements.
The Standards, Guiding Principles and Recommendations in this sub-section are illustrated in the decision tree/flow chart shown as '''Figure 3.3''', and must be read in conjunction with '''3.3 Application'''.
====<big>General</big>====
<li>The ''Design Authority'' is responsible for the proper calculation of ''Specified Wind Loads'' for a waterproofing roof assembly, regardless of its design, and must use the [https://www.nrc-cnrc.gc.ca/eng/services/windrci/agreement.html '''Wind-RCI online wind calculator'''] or, in the alternative, another method that is its equal or superior. This includes roofs that support an overburden, including ''Vegetated Roof Assemblies''. When the geometry of a building exceeds the capabilities of the Wind-RCI calculator, the ''Design Authority'' must calculate wind loads in accordance with the ''BCBC, Division B, Part 4, 4.1.7 Wind Loads'', and in consultation with other sections of the BCBC as they pertain to the determination of ''Specified Wind Loads''. Acceptance of a roof for a '''''RoofStar Guarantee''''' is predicated on the assumption that the ''Design Authority'' has performed Due Diligence with respect to ''Specified Wind Loads'' and the attachment methods for the roof assembly.
<li>The ''Design Authority'' is responsible for the proper calculation of ''Specified Wind Loads'' for a roof ''Waterproofing System'', regardless of its design, and must use the [https://www.nrc-cnrc.gc.ca/eng/services/windrci/agreement.html '''Wind-RCI online wind calculator'''] or, in the alternative, another method that is its equal or superior. This includes roofs that support an overburden, including ''Vegetated Roof Systems''. When the geometry of a building exceeds the capabilities of the Wind-RCI calculator, the ''Design Authority'' must calculate wind loads in accordance with the ''British Columbia Building Code, Division B, Part 4, 4.1.7 Wind Loads'', and in consultation with other sections of the ''British Columbia Building Code'' as they pertain to the determination of ''Specified Wind Loads''. Acceptance of a roof for a '''''RoofStar Guarantee''''' is predicated on the assumption that the ''Design Authority'' has performed Due Diligence with respect to ''Specified Wind Loads'' and the attachment methods for the roof assembly.
<li>All waterproofing roof assemblies shall consist of the following three zones, illustrated in '''Figure 3.1'''.
<li>All roof ''Waterproofing Systems'' shall consist of the following three zones, illustrated in '''Figure 3.1'''.
<li>'''Field (F)''' – the interior of the roof bounded by the Edge and the Corners.
<li>'''Field (F)''' – the interior of the roof bounded by the ''Edge'' and the ''Corners''.
<li>'''Edge (E)''' – defined as 10% of the building width or 40% of the building height, whichever is less. In no case will perimeter zone be less than 2.0 m (7').
<li>'''Corner (C)''' – part of the perimeter but not less than 2.0 m x 2.0 m (7’ x7’) in size. The corner area is defined by the Edge in both directions at the corners.<br>
<li>'''Corner (C)''' – part of the perimeter but not less than 2.0 m x 2.0 m (7’ x7’) in size. The ''Corner'' area is defined by the ''Edge'' in both directions at the corners.<br>
<li>A conventionally insulated roof assembly, and a ''Modified Protected Membrane Roof Assembly'' (MPMRA), constructed on a bare roof deck (new construction and replacement roofing) must be secured using
<li>A ''Conventionally Insulated Systems'', and a ''Modified Protected Membrane Roof System'', constructed on a bare roof deck (new construction and replacement roofing) must be secured using
<li>a ''Tested Assembly'' (see '''3.3.1.1 Tested Assemblies''').
<li>an ''Assembly with Proven Past Performance'' (see '''3.3.1.2 Roof Assemblies with Proven Past Performance''').
<li>engineered methods and patterns (see '''3.3.1.3'''; also refer to the ''British Columbia Building Code'', Div. B, Part 4 and Part 5 together with the ''ANSI/SPRI WD-1'' methodology referenced in the BCBC, ''Notes to Part 5 – Environmental Separation, A-5.2.2.2.(4)'').</li></ol>
<li>engineered methods and patterns (see '''3.3.1.3'''; also refer to the ''British Columbia Building Code'', Div. B, Part 4 and Part 5 together with the ''ANSI/SPRI WD-1'' methodology referenced in the ''British Columbia Building Code, Notes to Part 5 – Environmental Separation, A-5.2.2.2.(4)'').
<li>The wind uplift resistance capabilities of the selected roof assembly must equal or exceed the ''Specified Wind Loads''.
<li>The wind uplift resistance capabilities of the selected ''roof system'' must equal or exceed the ''Specified Wind Loads''.
<li>A roof consisting of a single elevation, divided into smaller roof areas by means of control joints (roof dividers) or expansion joints, shall be considered one roof area for the purpose of calculating the ''Specified Wind Loads''.
<li>When a building is designed with multiple roof levels,
<li>the ''Specified Wind Load'' for each roof area must be calculated separately, unless the roofs are adjacent each other and the elevation difference between roof areas is less than 1.52 m (5’).
<li>each roof area must be designed with Edge (E) zones on all sides, and Corner (C) zones at each outside and inside corner, irrespective of the elevation difference between the roofs.<br>
<li>each roof area must be designed with ''Edge'' (E) zones on all sides, and ''Corner'' (C) zones at each outside and inside corner, irrespective of the elevation difference between the roofs.<br>
|+ '''<small>Figure 3.2</small>'''
<li>When a roof includes an inside corner, the Corner zones must extend along each adjacent side of the roof a distance equal in dimensions to outside corners ('''Figure 3.2''').
<li>When a roof includes an inside corner, the ''Corner'' zones must extend along each adjacent side of the roof a distance equal in dimensions to outside corners ('''Figure 3.2''').
<li>When a roof area intersects the corner of a wall, the Edge zone on either side of the wall corner must be treated as a roof Corner (2 x C) ('''Figure 3.2''').
<li>When a roof area intersects the corner of a wall, the ''Edge'' zone on either side of the wall corner must be treated as a roof ''Corner'' (2 x C) ('''Figure 3.2''').
<li>When an existing roof system is specified for partial replacement, the ''Design Authority'' must
<li><span class="recommended">When specifying securement for a partial roof replacement, mechanical fastening, when practicable, is the recommended method for securing new materials to an existing roof system</span>. All other methods of securement must be designed and specified by the ''Design Authority''.
<li><span class="principles">Roof assemblies should be designed in conjunction with the electrical systems for the building, in order to avoid unnecessary interference with roof system securement</span>. <span class="recommended">Placement of cables and boxes in designated trays, suspended at least 38 mm (1 ½”) below a penetrable supporting deck, is strongly recommended in order to avoid contact with roofing fasteners; fastener penetration may result in shock or fire hazard</span>. <span class="principles">Steel plates should not be used to shield conduit and boxes on top of or immediately beneath a penetrable deck, because the plates will interfere with fastener placement and proper securement of the roof system</span>. See also '''2.7 Electrical Cables and Boxes'''.
<li>Securement of water-shedding assemblies shall be made in accordance with the requirements set out elsewhere in this ''Manual''.
<li>Securement of ''Water-shedding Systems'' shall be made in accordance with the requirements set out elsewhere in this ''Manual''.
|+ '''<small>Figure 3.3</small>'''
====<big>Roofs with Ballast or Overburdens</big>====
'''NOTE''': the reader must consult the Design and Application requirements in '''12.1 Protected and Modified Protected Membrane Roof Assemblies''', together with requirements in '''14 THE ROOF as a PLATFORM''' (with respect to ''Vegetated Roof Systems'').
'''NOTE''': the reader must consult the Design and Application requirements in '''12.1 Protected and Modified Protected Membrane Roof Systems''', together with requirements in '''Part 14 THE ROOF as a PLATFORM''' (with respect to ''Vegetated Roof Systems'').
#When vegetation and its growing media is intended as either ballast or ''Overburden'' on any membrane roof assembly, the ''Design Authority'' must, in addition to calculating the ''Specified Wind Loads'' for the roof assembly, determine the ''Specified Wind Loads'' for the ''Vegetated Roof Systems'' (VRS), and the dimensions of the roof zones, using the [https://www.nrc-cnrc.gc.ca/eng/services/windrci/agreementvra.html '''WIND-MVRA'''] online calculator tool or, in the alternative, another method that is its equal or superior. Note that this online resource applies only to buildings described on the Wind-RCI website at "low rise" and of moderate height (limited to 20 m or 65 feet) with a ''Waterproofing System'' roof. Designing appropriate securement of a VRS on roofs taller than 20 m (65') or with slopes greater than 2:12 must be undertaken by a licensed design professional using current wind engineering practices, and must be acceptable to the ''Authority Having Jurisdiction'' (AHJ). Securement methods and details of a VRS, regardless of building height and roof slope, are the responsibility of the ''Design Authority''.
###the RGC ballast guide (see '''3.3.2 Ballasted Roof Assemblies''', and '''12.1 Protected and Modified Protected Membrane Roof Assemblies''').
###the RGC ballast guide (see '''3.3.2 Ballasted Roof Systems''', and '''12.1 Protected and Modified Protected Membrane Roof Systems''').
###the [http://rpm.rcabc.org/images/2/2f/Dupont_508.2_Ballast_Design_Guide_for_PMR_Systems_%282020-02%29.pdf '''Dupont Tech Solutions 508.2 Ballast Design Guide for PMR Systems'''].
#When pavers are selected as ballast for a ''Protected'' or ''Modified Protected Membrane Roof System'', the ''Design Authority'' is responsible for determining the support and placement of pavers to resist wind uplift.
#''Modified Protected Membrane Roof Systems'' must be designed for wind resistance following the requirements for ''Modified Protected Membrane Roof Systems'' and ''Conventionally Insulated Systems''.
#The ''Design Authority'' is responsible for determining the proper securement of any overburden intended for placement on top of the roof platform. For design, material and installation standards pertaining to roofs as platforms, refer in this ''Manual'' to '''14 The ROOF as a PLATFORM'''.
#The ''Design Authority'' is responsible for determining the proper securement of any overburden intended for placement on top of the roof platform. For design, material and installation standards pertaining to roofs as platforms, refer in this ''Manual'' to '''Part 14 The ROOF as a PLATFORM'''.
Any variance to the above must be accepted in writing by the owner or the owner's representative, and submitted to the '''''RoofStar Guarantee Program''''' as part of the Guarantee record.
Any variance to the above must be accepted in writing by the owner or the owner's representative, and submitted to the '''''RoofStar Guarantee Program''''' as part of the ''Guarantee'' record.
===Fasteners and Adhesives===
The following minimum standards apply to any ''roof system'', regardless of requirements published elsewhere.
<li>Fasteners and adhesives must be capable of securing the roof assembly components for ''Specified Wind Loads''.</li>
<li>Fasteners and adhesives must be capable of securing the ''roof system'' components for ''Specified Wind Loads''.</li>
<li><span class="principles">The ''Design Authority'' should specify the correct type of fastener, keeping in mind</span>
<li><span class="principles">pull-out strength.</span></li>
<li><span class="principles">corrosion resistance (contributing factors to fastener corrosion may include dissimilar metal contact, excessive building humidity, corrosive chemicals within components of the assembly, or corrosive elements provided within the building envelope etc.)</span>.</li>
<li><span class="principles">corrosion resistance (contributing factors to fastener corrosion may include dissimilar metal contact, excessive building humidity, corrosive chemicals within components of the ''roof system'', or corrosive elements provided within the building envelope etc.)</span>.</li>
<li> Unless otherwise listed in the assembly components of a ''Tested Assembly'', self-drilling screws with recessed heads must be used in combination with plates as follows:<br>
<li> Unless otherwise listed in the ''system'' components of a ''Tested Assembly'', self-drilling screws with recessed heads must be used in combination with plates as follows:<br>
|+ Table 3.1 Minimum Fastener and Plate Requirements
<li>Adhesives listed in a selected ''Tested Assembly'' must be used to secure applicable layers within the roof assembly. Adhesives may be substituted only with products listed in the ''Tested Assembly'' report.</li>
<li>Adhesives listed in a selected ''Tested Assembly'' must be used to secure applicable layers within the ''roof system''. Adhesives may be substituted only with products listed in the ''Tested Assembly'' report.</li>
<li>In the absence of a ''Tested Assembly'', or for adhered and partially adhered ''Assemblies with Proven Past Performance'', adhesives must be acceptable to the manufacturers of the roof assembly components.</li>
<li>Bitumen used as a hot-applied adhesive must be Type 3 or SEBS.</li>
| [[File:Figure 3.3.jpg|link=http://rpm.rcabc.org/images/6/6f/Figure_3.3.jpg |40 px]]
The information in this section may assist the ''Design Authority'' in better understanding the complexities of calculating specified wind loads, how wind affects a roof and each of its zones, and how to properly apply fastener or adhesive configurations for each zone and its respective specified wind loads.
The information in this section may assist the ''Design Authority'' in better understanding the complexities of calculating ''Specified Wind Loads'', how wind affects a roof and each of its zones, and how to properly apply fastener or adhesive configurations for each zone and its respective specified wind loads.
<span class="reference">''Specified Wind Loads'' are forces exerted by wind which, in the case of waterproofing roof assemblies, both push and lift the roof assembly or its components. Often, the upward or uplift forces are expressed as a negative value (negative pressure), but these are influenced by many variables including, without limitation, wind speed, building height, roof slope, wall openings, roof overhangs and ground roughness</span>.
<span class="reference">''Specified Wind Loads'' are forces exerted by wind which, in the case of membrane roof ''Waterproofing Systems'', both push and lift the ''roof system'' or its components. Often, the upward or uplift forces are expressed as a negative value (negative pressure), but these are influenced by many variables including, without limitation, wind speed, building height, roof slope, wall openings, roof overhangs and ground roughness</span>.
<span class="principles">''Specified Wind Loads'' for membrane roof assemblies should be calculated using the available online[https://www.nrc-cnrc.gc.ca/eng/services/windrci/agreement.html '''Wind-RCI online wind calculator'''] or, in the alternative, another method that is its equal or superior (click [http://rpm.rcabc.org/images/5/5d/Sample_RCI_Report.pdf '''here'''] for a sample report).</span> When the Wind-RCI calculator is not suitable (as, for example, when a building exceeds 150 feet in height), the ''Design Authority'' must refer to the ''British Columbia Building Code, Div. B, Parts 4'' and ''Part 5'' for further guidance.
<span class="principles">''Specified Wind Loads'' for membrane roof ''Waterproofing Systems'' should be calculated using the available online[https://www.nrc-cnrc.gc.ca/eng/services/windrci/agreement.html '''Wind-RCI online wind calculator'''] or, in the alternative, another method that is its equal or superior (click [http://rpm.rcabc.org/images/5/5d/Sample_RCI_Report.pdf '''here'''] for a sample report).</span> When the Wind-RCI calculator is not suitable (as, for example, when a building exceeds 150 feet in height), the ''Design Authority'' must refer to the ''British Columbia Building Code, Division B, Parts 4'' and ''Part 5'' for further guidance.
The report generated by the Wind-RCI calculator will specify the wind loads for the corners, the perimeter and the roof field. These zone loads must be applied in Step 3 when determining the method of ''roof system'' securement.
====Non-conforming Buildings====
#The ''Design Authority'' remains responsible for the proper design of a membrane roof assembly, regardless of its method of attachment. Refer to the ''British Columbia Building Code, Div. B, Parts 4'' and ''Part 5'' for further guidance.
#The ''Design Authority'' remains responsible for the proper design of a membrane roof ''Waterproofing System'', regardless of its method of securement. Refer to the ''British Columbia Building Code, Div. B, Parts 4'' and ''Part 5'' for further guidance.
#Roof assemblies for non-conforming buildings must be engineered for proper securement to withstand wind loads.
#''Roof systems'' for non-conforming buildings must be engineered for proper securement to withstand wind loads.
#Non-conforming building roof assemblies must incorporate RoofStar-accepted materials.
#Non-conforming building ''roof systems'' must incorporate RoofStar-accepted materials.
===Step 2: Select the Type of Roof Assembly===
Methods for securing the roof depend, in part, on the type of roof. How a conventionally insulated roof is secured is quite different from the securement principles and methods for a ''Protected Membrane Roof Assembly''. Conventionally insulated roofs that support any type of overburden should be treated like an uncovered roof, and secured accordingly (see below for options available to secure a conventional roof assembly); the ''Vegetated Assembly'' itself is subject to different securement methods, based on its own ''Specified Wind Loads''. Protected Membrane assemblies, on the other hand, are secured completely separately. Guidance for these also is provided below.
Methods for securing the roof depend, in part, on the type of roof. How a ''Conventionally Insulated System'' is secured is quite different from the securement principles and methods for a ''Protected Membrane Roof System''. ''Conventionally Insulated Systems'' that support any type of ''Overburden'' should be treated like an uncovered roof, and secured accordingly (see below for options available to secure a ''Conventionally Insulated System''); the ''Vegetated Assembly'' itself is subject to different securement methods, based on its own ''Specified Wind Loads''. ''Protected Membrane Roof Systems'', on the other hand, are secured completely separately. Guidance for these also is provided below.
Follow the path in '''Step 3''' that fits with your roof assembly design.<br>
:::*Conventionally insulated
:::*''Conventionally Insulated Systems''
:::*Ballasted
:::*Ballasted ''systems''
:::*Roofs supporting an overburden
:::*Roofs supporting an ''Overburden''
:::*Partially replaced roofs
====Conventionally Insulated Roof Assemblies====
Whether the conventionally insulated roof is covered or uncovered, it must be secured using one of three methods. These are presented below as a progression from simplicity to complexity, and from low cost (for the ''Design Authority'') to high cost.
Whether the ''Conventionally Insulated System'' is covered or uncovered, it must be secured using one of three methods. These are presented below as a progression from simplicity to complexity, and from low cost (for the ''Design Authority'') to high cost.
If the intent of the ''Design Authority'' is to replace only a part of the existing roof system, see '''2.7.2''' for guidance and options. See also '''3.3.3.4''' below.
=====<u><big>Tested Assemblies</big></u>=====
<span class="reference">''Tested Assemblies'' are material components that have been selected by the membrane manufacturer, secured using one of three methods, and tested by an independent certified laboratory to determine the limits of the assembly’s ability to resist negative wind pressure (loads), or ‘wind uplift’. Each of the three methods is expressed with an acronym</span>:
<span class="reference">''Tested Assemblies'' are material components that have been selected by the membrane manufacturer, installed on a specific ''deck'' type, secured using one of three methods (securement ''system''), and tested by an independent certified laboratory to determine the limits of the assembly’s ability to resist negative wind pressure (loads), or ‘wind uplift’. Each of the three methods is expressed with an acronym</span>:
:[http://rpm.rcabc.org/index.php?title=MARS_Tested_Roof_Systems '''MARS''']<span class="reference">, or ''Mechanically Attached Roof Systems'' – these systems are held in place only with mechanical fasteners that are installed at the membrane layer</span>.
:[http://rpm.rcabc.org/index.php?title=MARS_Tested_Roof_Systems '''MARS''']<span class="reference">, or ''Mechanically Attached Roof Systems'' – these ''systems'' are held in place only with mechanical fasteners that are installed at the membrane layer</span>.
:[http://rpm.rcabc.org/index.php?title=PARS_Tested_Roof_Systems '''PARS''']<span class="reference">, or ''Partially Adhered Roof Systems'' – both mechanical fasteners and adhesives are used as a hybrid method of securement; the membrane is always adhered, using an applied adhesive or heat-welding</span>.
:[http://rpm.rcabc.org/index.php?title=AARS_Tested_Roof_Systems '''AARS''']<span class="reference">, or ''Adhesive Applied Roof Systems'' – these are roofs secured only with adhesives or heat-welded components</span>.
:[http://rpm.rcabc.org/index.php?title=AARS_Tested_Roof_Systems '''AARS''']<span class="reference">, or ''Adhesive Applied Roof Systems'' – these are membrane roofs secured only with adhesives or heat-welded components</span>.
Only ''Tested Assemblies'' that have been tested by qualified facilities wholly independent of roof system manufacturers will be regarded by the '''''RoofStar Guarantee Program''''' as legitimate. Click [http://rpm.rcabc.org/index.php/CSA_A123.21_Qualified_Test_Facilities '''here'''] for a list of qualified testing agencies.
Only ''Tested Assemblies'' that have been tested by qualified facilities wholly independent of ''roof system'' manufacturers will be regarded by the '''''RoofStar Guarantee Program''''' as legitimate. Click [http://rpm.rcabc.org/index.php/CSA_A123.21_Qualified_Test_Facilities '''here'''] for a list of qualified testing agencies.
To find a ''Tested Assembly'', follow any of the links shown above.
#<span class="recommended">The ''Design Authority'' is strongly encouraged to specify the application of a ''Tested Assembly'', for any design of a new roof or full roof replacement</span>.
#<span class="recommended">The ''Design Authority'' is strongly encouraged to specify the application of a ''Tested Assembly'', for any design of a new membrane roof Waterproofing System or full roof replacement of a membrane roof ''Waterproofing System''</span>.
#The ''Design Authority'' must use only the test observation readings that have been adjusted for the Safety Factor.
#''Tested Assembly'' observation readings, reduced by the Safety Factor, must equal or exceed the highest ''Specified Wind Loads'' for the roof. This is called the ''Dynamic Uplift Resistance'' (DUR).
=====<u><big>Roof Assemblies with Proven Past Performance</big></u>=====
#A roof ''Assembly with Proven Past Performance'' is an assembly utilizing materials acceptable for the '''''RoofStar Guarantee Program''''', that has a proven track record of wind uplift resistance
#A roof ''Assembly with Proven Past Performance'' is a ''Conventionally Insulated System'' installed on a specific supporting deck that utilizes materials acceptable for the '''''RoofStar Guarantee Program''''', and which has demonstrated a proven track record of wind uplift resistance
##for at least as long as the expected life of the roof assembly
##for at least as long as the expected life of the new ''roof system''.
##for buildings, and in conditions, that are reasonably representative of the ''Project'' the assembly will be specified for
##for buildings, and in conditions, that are reasonably representative of the ''Project'' the ''roof system'' will be specified for.
#Roof assemblies with proven past performance
##are an acceptable alternative to a ''Tested Assembly'' when
###material components in a ''Tested Assembly'' are not accepted by the '''''RoofStar Guarantee Program''''', and the ''Tested Assembly'' offers no suitable alternates.
###a ''Tested Assembly'' is not available because
####a material or system has not been tested.
####a material or ''system'' has not been tested.
####the ''Specified Wind Loads'' exceed the capacity of an available for suitable ''Tested Assembly''.
####the ''Specified Wind Loads'' exceed the capacity of an available or suitable ''Tested Assembly''.
##may be used for partial roof replacement.
#''Assemblies with Proven Past Performance'' must be
##designed to exceed the ''Specified Wind Loads'' for the building .
##designed to exceed the ''Specified Wind Loads'' for the roof.
##supported with a signed letter of assurance, issued by the ''Design Authority'' or the manufacturer of the proven assembly, that the assembly will perform as required.
##supported with a signed letter of assurance, issued by the ''Design Authority'' or the manufacturer of the ''Assembly with Proven Past Performance'', that it will perform as required.
#Approvals issued by FM Global or another underwriter, for roof assemblies capable of resisting the ''Specified Wind Load'' of the Project, may be given consideration by the '''''RoofStar Guarantee Program''''', but must be delivered to the RCABC for review and written acceptance, along with a letter of assurance from the ''Design Authority'' or the manufacturer.
#Approvals issued by FM Global or another underwriter, for ''roof systems'' capable of resisting the ''Specified Wind Load'' of the ''Project'', may be given consideration by the '''''RoofStar Guarantee Program''''', but must be delivered to the ''Guarantor'' for review and written acceptance, along with a letter of assurance from the ''Design Authority'' or the manufacturer.
=====<u><big>Engineered Designs</big></u>=====
When, for various reasons, a system of securement cannot be designed using either a ''Tested Assembly'' or an ''Assembly with Proven Past Performance'', the ''Design Authority'' must have the securement system designed by a qualified engineer following the requirements of the ''British Columbia Building Code''.
When, for various reasons, a system of securement cannot be designed using either a ''Tested Assembly'' or an ''Assembly with Proven Past Performance'', the ''Design Authority'' must have the securement system designed by a qualified engineer following the requirements of the ''British Columbia Building Code, Division C, 2.2.1.2. Structural Design''.
====Ballasted Roof Assemblies (PMRAs and MPMRAs)====
====Ballasted Roof Systems====
'''NOTE''': the reader must consult the Design and Application requirements for '''12.1 Protected and Modified Protected Membrane Roof Assemblies''', and for '''14 THE ROOF as a PLATFORM''' (with respect to ''Vegetated Roof Systems'').
'''NOTE''': the reader must consult the Design and Application requirements for '''12.1 Protected and Modified Protected Membrane Roof Systems''', and for '''Part 14 THE ROOF as a PLATFORM''' (with respect to ''Vegetated Roof Systems'').
<li>Roof assemblies secured with gravel ballast, pavers or both must be designed to resist wind uplift, regardless of any overburden the design may call for. To facilitate resistance to wind uplift,
<li>''Roof systems'' secured with gravel ballast, pavers or both must be designed to resist wind uplift, regardless of any overburden the design may call for. To facilitate resistance to wind uplift,
<li>gravel ballast for a ''Protected Membrane Roof System'' must conform to
<li>the following minimum requirements, {{hilite | subject to the calculations for wind uplift resistance|| 2020-July-3 }}:
:::{| class="wikitable" style="text-align: left; margin-left: 20pt; margin-right: auto; border: none;"
|+ Table 3.2 RGC Ballast Guide
<li>the appropriate design derived from [https://www.dow.com/webapps/lit/litorder.asp?filepath=styrofoam/pdfs/noreg/179-00044.pdf '''DOW 508.2 Ballast Design Guide for PMR Systems'''].
<li>the appropriate design derived from [http://rpm.rcabc.org/images/2/2f/Dupont_508.2_Ballast_Design_Guide_for_PMR_Systems_%282020-02%29.pdf '''Dupont Tech Solutions 508.2 Ballast Design Guide for PMR Systems'''].
<li><span class="recommended">On roofs specified to utilize gravel ballast, no fewer than two parallel rows of pavers should be considered for Corner and Edge-zones, to prevent or reduce wind scouring of the gravel. Pavers should be secured together when specified by the Ballast Design Guide</span>.
<li><span class="recommended">On roofs specified to utilize gravel ballast, no fewer than two parallel rows of pavers should be considered for ''Corner'' and ''Edge'' zones, to prevent or reduce wind scouring of the gravel. Pavers should be secured together when specified by the Dupont Ballast Design Guide</span>.
<li>Loose-laid membranes held in place with gravel ballast must be secured with gravel ballast having sufficient size and weight to resist wind uplift, but shall in any event meet the following minimum requirements:
====Roofs Supporting an Overburden====
#Any supported overburden must be installed in keeping with the designed securement methods and systems specified by the ''Design Authority'', and must equal or exceed the ''Specified Wind Loads'' for the roof.
#Any supported ''Overburden'' must be installed in keeping with the designed securement methods and systems specified by the ''Design Authority'', and must equal or exceed the ''Specified Wind Loads'' for the roof.
#''Vegetated Roof Systems'' (VRSs) constructed in modules must be secured according to the methods specified by the ''Design Authority''.
====Partial Roof Replacements====
====Partial Roof Replacement====
#When only a portion of an existing roof system is specified for replacement, the new materials must be secured to resist wind uplift. See also '''1.4.2 Replacement Roofing'''.
#When only a portion of an existing ''roof system'' is specified for replacement, the new materials must be secured to resist wind uplift. See also '''1.4.2 Replacement Roofing'''.
#Mechanical fastening is the most reliable method for securing new materials installed over an existing roof assembly. When mechanical fastening is not practicable, the system of securement must conform to one of the following options:
#A custom-engineered design.
<li>steel decks at least 20 mm (3/4") – <span class="principles">fasteners should penetrate the top flutes only</span>.
<li>{{strike| into || 2021-June-18 }} solid dimensional lumber {{hilite | or a solid concrete deck || 2021-June-18 }} {{strike| or plywood sheathing || 2021-June-18 }} by at least 25 mm (1").
<li>When mechanically attached membranes are installed together with new insulation, the insulation assembly {{hilite | (with or without an Overlay)|| 2020-July-3 }} must be held in place independently from the membrane, with no fewer than four (4) fasteners per panel.
<li>'''Table 3.3''' shows the minimum required number of fasteners, unless otherwise specified by a ''Tested Assembly'', an ''Assembly with Proven Past Performance'', or a custom-engineered assembly. Also see the required patterns, displayed below the table:
=====<big><u>Adhesive Applied</u></big>=====
#Adhesives may be used to secure new roofing materials to an existing roof system, provided the specific application procedures and methods are engineered by or for the ''Design Authority''.
#Adhesives may be used to secure new roofing materials to an existing ''roof system'', provided the specific application procedures and methods are engineered by or for the ''Design Authority''.
#Notwithstanding the above, the minimum requirements set out in '''7.3.2.4''' apply.
Mechanical fasteners must penetrate through the top surface of
into solid dimensional lumber or a solid concrete deck or plywood sheathing by at least 25 mm (1").
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