Source: https://www.scribd.com/document/340097781/Stepoc-BBA-pdf
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Matched Legal Cases: ['art 1', 'art 1', 'art 2', 'art 1', 'art 1', 'art 2', 'art 101', 'art 102', 'art 1', 'art 1', 'art 3', 'art 2', 'art 3', 'art 1', 'art 1', 'art 3', 'art 1', 'art 1', 'art 102', 'art 2', 'art 1', 'arts 1', 'art 1', 'art 2', 'art 1', 'art 3', 'art 101']

Stepoc BBA.pdf | Masonry | Concrete
Uploaded by Ashwin B S Rao
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Electronic Copy CI/SfB
(16.4) Fq4
Hillhead Quarry Agrément
Buxton Certificate
Derbyshire SK17 9PS No 98/3450
Tel: 01298 23333 Fax: 01298 23000
Designated by Government
to issue STEPOC FOUNDATION BLOCKWORK
Approvals Blocs de béton de foundation
Betonvandstein
• THIS CERTIFICATE RELATES
TO STEPOC FOUNDATION Building Regulations
BLOCKWORK COMPRISING
STEPOC HOLLOW BLOCKS, 1 The Building Regulations 1991 (as amended 1994) (England and Wales)
AVAILABLE IN TWO The Secretary of State has agreed with the British Board of Agrément
NOMINAL SIZES AND FILLED the aspects of performance used by the BBA in assessing the
WITH UNREINFORCED compliance of foundation walls with the Building Regulations. In the
STRUCTURAL CONCRETE. opinion of the BBA, Stepoc Foundation Blockwork, if used in accordance with
the provisions of this Certificate, will meet the relevant requirements.
• Stepoc blockwork has been
Requirement: A1 Loading
assessed for use below the
Comment: Stepoc blockwork has adequate strength and stiffness and
damp-proof course in:
therefore meets the requirements of the regulation provided that:
(a) the inner and outer leaves (a) it is correctly installed (see section 14 of this Certificate)
of cavity walls, and (b) the design strengths are in accordance with section 8 and
(b) solid external and internal Table 2 of this Certificate.
Requirement: B3(1) Internal fire spread — structure
Comment: Stepoc blockwork, without chasing or holes, has a notional period
• Walls are constructed by of fire resistance of 2 hours and is therefore satisfactory subject to
laying the Stepoc blocks dry in the requirements of each purpose group as set out in Approved
a one-third running bond and Document. See section 12 of this Certificate.
Requirement: B3(3) Internal fire spread — structure
then filling with a structural
grade concrete. Comment: The surface of the blocks is designated Class 0. This should be
taken into consideration in determining the need for cavity
barriers. See section 12 of this Certificate.
Readers are advised to check the validity of this Certificate by either referring to the Index of Current BBA Publications or contacting
the BBA direct (Telephone Hotline 01923 665400).
the building.1 Selection and use of materials and components • This product has previously Comment: Stepoc blockwork is acceptable. See section 12 of this Certificate. Stepoc blockwork is designated Class 0 material. • It is essential that Stepoc Foundation Blockwork is 2 The Building Standards (Scotland) Regulations 1990 (as amended) constructed in accordance with In the opinion of the BBA. Regulation: 11 Structure Standard: C2. Stepoc blockwork is acceptable. Requirement: B4(1) External fire spread Figure 1 are also the work Comment: Stepoc blockwork is non-combustible and designated Class 0 sizes as there are no mortar and therefore will not be subject to the limitations of a minimum joints. See section 12 of this Certificate. See section 14 of this Certificate. Regulation: B2 Fitness of materials and workmanship Comment: Stepoc blockwork is acceptable. parts of this Certificate. without chasing or holes. 2 . See section 12 of this • Walls should not exceed 10 Certificate. will satisfy the various Building Regulations as listed below. Standard: D2. without chasing or holes. and therefore will not be subject to the limitations of a minimum distance from any point on the boundary. Stepoc Foundation Blockwork. has a notional period of fire resistance of 2 hours and may be used in elements of structure subject to the requirements for each purpose group See section 12 of this Certificate.2 Fire resistance Comment: Stepoc blockwork. will sustain and transmit the design load to the foundation without impairing the stability of. will satisfy the various Design Data and Installation Regulations as listed below. distance from any point on the boundary. See the nominal sizes shown in section 12 of this Certificate. Regulation: 10 Fitness of materials Standard: B2. or damaging any part of. using the data given in Table 2 of this Certificate. (b) when Stepoc blocks are designed to BS 5628 : Part 1 : 1992 the design strengths given in section 8 and Table 2 of this Certificate are taken into account. Regulation: D1 Loading Comment: Stepoc blockwork has adequate strength and stiffness to sustain and transmit the loads to the foundation without impairing the stability of. Stepoc Foundation Blockwork. See sections 10 and 11 of been the subject of Agrément this Certificate. if used in accordance with the provisions of this Certificate. See sections 10 and 11 of this Certificate. or damaging any part of. 3 The Building Regulations (Northern Ireland) 1994 (as amended 1995 and 1997) In the opinion of the BBA. has a notional period of fire resistance of 2 hours and may be used in elements of structure subject to the requirements for each occupancy group. Regulation: E8 External fire spread Comment: Stepoc blockwork is non-combustible and designated Class 0. Regulation: 12 Structural fire precautions Standard: D2.3 Non-combustibility Comment: Stepoc blockwork is non-combustible and may therefore form part of any wall required to be non-combustible in accordance with the Table to this Regulation. Requirement: Regulation 7 Materials and workmanship courses in height before filling with fresh concrete.1 Construction Comment: Stepoc blockwork designed to BS 5628 : Part 1 : 1992.continued Electronic Copy Requirement: B3(4) Internal fire spread — structure Comment: Stepoc blockwork is non-combustible and therefore meets the • Designers should note that requirement for limited combustibility for separating walls. See section 12 of this Certificate. See section 8 of this Certificate. Regulation: E6 Internal fire spread — structure Comment: Stepoc blockwork. Certificate No 85/1574. See section 12 of this Certificate. Comment: When required to achieve compliance with relevant requirements of the Building Regulations. and will therefore satisfy the requirements for the surfaces of every purpose group. the building provided that: (a) it is correctly installed. if used in the conditions set out in the accordance with the provisions of this Certificate.
2 Quality control includes tests on aggregates. are given in Table 1. type strength* (mm) (kg) (Nmm–2) 5 Manufacture 190 400 ⫻ 225 ⫻ 190 16. to BS 882 : 1983. 4 Description monitoring of the batching and mixing process 4.6 3.5 5. The blocks should be stored on are available with plain ends for each block type dry. 4. Table 1 Characteristic properties 4. 3 and 4).4 3. pallets which can be handled by forklift trucks or Special blocks of one-third length and full length mechanical grabs.3 The mean compressive strengths of blocks. level ground. measured amounts of *in accordance with BS 6073 : Part 2 : 1981 Figure 1 Shape and dimensions of Stepoc blocks 3 .1 Stepoc blocks are manufactured from Portland and tests to BS 6073 : 1981 on the finished cement to BS 12 : 1996 and selected aggregates blocks. Electronicthe concrete Copy mix are transferred into an extrusion Technical Specification machine that forms the blocks.1 The raw materials for the blocks are fed into 256 400 ⫻ 225 ⫻ 256 19.2 Stepoc blocks are available in two standard 6 Delivery to site sizes (see Figure 1 and Table 1) and manufactured The blocks are supplied in banded cubes on to the requirements of BS 6073 : Part 1 : 1981. for use in the construction of corners and junctions (see Figures 2.5 a continuous batching plant. 5. when tested in accordance with BS 6073 : Stepoc Nominal Average Specified Part 1 : 1981 and evaluated in accordance with block dimensions weight compressive BS 6073 : Part 2 : 1981.
ie with a slump of a minimum 150 mm sampled in accordance with BS 1881 : Part 101 : 1983 and determined in accordance with BS 1881 : Part 102 : 1983.5† A or = 0. Electronic Copy Design Data Figure 4 Cross-junction detail 7 General 7.1 block = 14 256 mm block = 18 Shear (fv) either = 0. 4 . which can be used for design calculations in accordance with BS 5628 : Part 1 : 1992.6g * ␥mv = 2. Figure 2 Corner detail 8 Blockwork strength The characteristic strengths and the appropriate partial safety factors for the blockwork. †may not be reduced when considering the probable effects of misuse or accidental damage. 3 and 4). 9 Infill concrete The infill concrete must comply with the following requirements: (1) The concrete must be able to flow easily through the Stepoc blockwork (see Figure 5) and must therefore be of a consistency suitable for pumping. 7.37 *A is the design vertical load per unit of wall cross-section due to the vertical loads calculated from the appropriate loading conditions specified in BS 5628 : Part 1 : 1992.1 Stepoc Foundation Blockwork is satisfactory for use below the damp-proof course in inner and outer leaves of cavity walls and in solid external and internal walls. are summarised in Table 2.2 Special blocks of one-third length and full length are available with plain ends for each type of block for use in the construction of corners and cross and tee junctions (see Figures 2. Table 2 Design strengths Characteristic strength Material partial (Nmm–2) safety factor Figure 3 Tee-junction detail Compressive (fk ) 190 mm ␥m = 3.
the freeze/thaw conditions that are likely to occur below a damp-proof course.2 gl–1 of SO4 in 2:1 water:soil extract. will have 15. 2 and 3 of this Certificate).4 gl–1 of SO4 in groundwater. Electronicgenerally Copy in accordance with the fire resistance of Figure 5 Installation of Stepoc blockwork walls loadbearing masonry comprising solid blocks made from Class 1 aggregate concrete having a minimum thickness of 100 mm (BS 5628 : Part 3 : 1985 : Table 16). Any adjustments made holes.2 of slab foundations designed and constructed in BS 5328 : Part 2 : 1991. must be compacted using hand-held rods at the wall-tie locations to prevent the formation of voids. Compliance section. corrections to level and plumb may be notional period of fire resistance for all made by placing small timber wedges or loose thicknesses of Stepoc blockwork.2 Subsequent courses are laid dry in a one- third running bond (see Figure 5).without chasing or sand between courses. concrete mix only in accordance with the recommendations of Section 6.1 When installed in accordance with on completion of alternate courses. with the specified characteristic strength should be 14.1. 15. • laid directly onto the foundation using loose sand and small timber wedges where required to (5) The mix shall contain not less than 300 kg of ensure alignment and level Portland cement per cubic metre of fresh concrete. and to a string line stretched tight with concrete complying with the specification between the corner blocks. intervals not greater than 900 mm horizontally and and 450 mm vertically. wall ties of the double triangle type to conditions as defined by BRE Digest No 363: BS 1243 : 1978 can be accommodated by less than 0. with the open 11 Resistance to sulphate attack end of one block engaging the ribbed end of the Stepoc Foundation Blockwork. 13 Movement joints Movement joints should be designed as for concrete masonry in accordance with BS 5628 : Part 3 : 1985.4 Vertical faces should be checked for plumb 12. accordance with the recommendations of BS 8004 : (3) Admixtures should be added to the fresh 1986 and BS 8110 : Part 1 : 1997. Installation 14 General 14. uneven foundation surface 10 Resistance to frost damage • set in a nominal 10 mm thick bed of mortar but no mortar must be allowed between the Stepoc foundation blockwork is resistant to perpends of the blocks. the (2) The concrete must have a minimum main requirements of which are reproduced in this characteristic strength of 35 Nmm–2. Where the requirements of this Certificate the necessary.2 The blocks should be laid on concrete strip or judged in accordance with Section 16. in section 9 of this Certificate.1 Installation must be carried out in accordance with the Stepoc Block Instruction Manual (available from Forticrete Ltd). has been assessed as 2 hours. 12. 12 Behaviour in relation to fire 15. When the concrete is poured it less than 0. This is during the laying of the blocks should be carefully 5 .1 The first course of blocks are: level and smooth foundation surface (4) The maximum aggregate size shall not exceed 10 mm.5 of BS 8110 : 15 Procedure Part 1 : 1997. 15. when filled adjacent block.24% SO4 in soil by acid extraction lateral notches in the top of the block shell at less than 1.3 For cavity wall construction using Stepoc adequate resistance to Class 1 sulphate ground blocks.2 Stepoc blockwork is non-combustible and will therefore have a Class 0 surface spread of flame rating (see sections 1.
sleeves. concrete in the ground 6 . examined to confirm that the characteristic vents and pipes in accordance with the compressive strength of the blocks was determined recommendations of BS 5628 : Part 3 : 1985. Appendix A3 — BS 8004 : 1986 Code of practice for foundations characteristic flexural strength of Stepoc wallettes laid dry and filled with concrete. consideration must be given to the pressures exerted by the infill concrete and Bibliography the need to ensure that no voids are created due to the concrete flow being obstructed. (d) Compressive tests — on Stepoc walls laid dry MOAT No 12 : 1977 The Assessment of Precast. BS 8110 Structural use of concrete Part 1 : 1997 Code of practice for design and (c) To MOAT No 12 : 1977 — freeze/thaw construction resistance of concrete filled blocks. The manufacturer’s quality 15. the unfilled blockwork should be and site visits were made to assess the propped to ensure adequate stability during the practicability of installation. in accordance with BS 6073 : Part 1 : 1981. and concrete on site • the method of transportation and placing does Part 102 : 1983 Method for determination of not incur an additional risk to the stability of the slump wall. 17. BS 5328 Concrete Part 2 : 1991 Methods for specifying concrete Technical Investigations mixes The following is a summary of the technical BS 5628 Code of practice for use of masonry investigations carried out on Stepoc Foundation Part 1 : 1992 Structural use of unreinforced Blockwork.6 The blockwork is cut or trimmed to control procedures were witnessed and records accommodate inserts such as ducting. Consideration BS 12 : 1996 Specification for Portland cement must also be given to the effects that trimming. through fittings and inserts will have on the fire BS 882 : 1992 Specification for aggregates from resistance of Stepoc blockwork. design 16 Tests and workmanship The following tests were carried out: BS 6073 Precast concrete masonry units (a) To BS 6073: Parts 1 and 2: 1981 Part 1 : 1981 Specification for precast concrete dimensional accuracy masonry units dry density of blocks Part 2 : 1981 Method for specifying precast dry density of block material. When specifying or detailing inserts to pass through a Stepoc wall. however. Electronic Copy inspected before pouring the infill concrete. is made.5 No more than 10 courses of unfilled relating to the structural performance of the blockwork may be laid before a concrete pour blockwork filled with concrete. concrete masonry units (b) To BS 5628 : Part 1 : 1992. masonry Part 3 : 1985 Materials and components. and then filled with concrete. Where 17 Other investigations a number of corrections to level and plumb have 17. it may be placed by cavity wall construction alternative methods provided that: BS 1881 Testing concrete • fresh concrete can flow in a similar manner to Part 101 : 1983 Method of sampling fresh pumped concrete.2 An evaluation was made of existing data 15. both filled with concrete BRE Digest 363 Sulphate and acid resistance of and unfilled.7 The concrete should preferably be placed BS 1243 : 1978 Specification for metal ties for by pumping.3 The manufacturing process was examined and construction. Provision should be made to prevent debris from entering the block cavities during 17. details were obtained of the quality and composition of the materials used. concrete pour. natural sources for concrete 15.1 The erection of a trial wall was observed been made. Insulating Concrete Blocks for General use in Building (e) Comparative compressive tests — on individual Stepoc blocks.
indirect result of the use of this product. (c) the nature of individual installations of the British Standard. or of any duty of care unlimited period provided: which exist at the date of this Certificate or in the (a) the specification of the product is unchanged. and 18.1 Where reference is made in this Certificate (b) the legal right of the Certificate holder to to any Act of Parliament. Statutory Instrument. the BBA does not accept responsibility 18. Code of Practice. nor is conformity with such recommendations and to be taken as satisfying the requirements of the (b) the manufacturer continues to have the product 1974 Act or of any present or future statutory or Common Law duties of care. used and maintained as set out in this Certificate. relating to the safe use of this product which are contained or referred to in this Certificate are the 18. it shall be construed as reference to such publication in the form in which it 18. similar publication. or of any other statutory or Certificate.4Copy In granting this Certificate. In granting this checked by the BBA. including methods and workmanship. future. Certificate No 98/3450 is accordingly awarded to Forticrete Ltd. They do not purport in any way to satisfactory by the BBA and must be maintained to restate the requirements of the Health & Safety at this standard during the period of validity of this Work etc Act 1974. In the opinion of the British Board of Agrément. Regulation made market. that is installed. Electronic18. arising as a direct or this Certificate. This Certificate will remain valid for an Common Law duties of care.5 It should be noted that any recommendations is in force at the date of this Certificate. used and maintained as set out in including personal injury.3 This Certificate will apply only to the product to any person or body for any loss or damage. On behalf of the British Board of Agrément Date of issue: 5th February 1998 Director 7 . Stepoc Foundation Blockwork is fit for its intended use provided it is installed. manufacturer’s instruction or product. the BBA makes Conditions of Certification no representation as to: (a) the presence or absence of patent or similar 18 Conditions rights subsisting in the product.2 The quality of materials and the method of minimum standards required to be met when the manufacture have been examined and found product is used. and thereunder. install or maintain the product. Certificate.
P O Box No 195.uk Hotline: 01923 665400 . Electronic Copy British Board of Agrément For technical or additional ©1998 information.com Certificate validity and scope.co. tel: 01923 665300. tel: Fax: 01923 665301 http://www. Bucknalls Lane For information about Agrément Garston.bbacerts. Watford. Herts WD2 7NG e-mail: bba@btinternet.
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