SECTION 07 7123

MANUFACTURED GUTTERS AND DOWNSPOUTS

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

LANL MASTER SPECIFICATION

This template must be edited for each project.  In doing so, specifier
must add job-specific requirements.  Brackets are used in the text to
indicate designer choices or locations where text must be supplied by
the designer.  Once the choice is made or text supplied, remove the
brackets.  The specifications must also be edited to delete
specification requirements for processes, items, or designs that are not
included in the project \-- and specifier's notes such as these.  To
seek a variance from requirements in the specifications that are
applicable, contact the Engineering Standards Manual Architectural
[POC](http://www.lanl.gov/orgs/eng/engstandards/POCs.shtml#arch). Please
contact POC with suggestions for improvement as well.\
\
When assembling a specification package, include applicable
specifications from all Divisions, especially Division 1, General
requirements.\
\
Specification developed for ML-4 projects.  For ML-1, 2, and 3
applications, additional requirements and independent reviews should be
added if increased confidence in procurement or execution is desired;
see ESM Chapter 1 Section Z10 Specifications and Quality sections.\
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

1.  GENERAL

    1.  SECTION INCLUDES

        A.  Pre-finished galvanized steel gutters and downspouts.

        B.  Fastening.

        C.  \[Precast concrete splash pads\] \[riprap\] at downspout
            outflows.

    2.  SYSTEM DESCRIPTION

        A.  Rainwater collection and disposal system externally mounted
            and drained.

    3.  SUBMITTALS

        A.  Submit the following in accordance with Section 01 3000,
            Submittals

            1.  Catalog Data: Manufacturer\'s product specifications,
                standard details, installation instructions and general
                recommendations, as applicable to materials and finishes
                for each component and their complete installation.

            2.  Shop Drawings: Complete shop drawings and erection
                details showing methods of erection, sections and
                details, flashings and all other accessories. Interface
                with all related work of other trades and proposed
                identification of component parts and finishes.

            3.  Samples: One cross sectional sample of guttering and
                downspout, including clips, fasteners as applicable to
                project. Submit two color chip samples in color selected
                by Architect.

            4.  Warranty: As specified herein.

    4.  QUALIFICATIONS

        A.  Manufacturer: Company specializing in manufacturing products
            specified in this section.

    5.  DELIVERY, STORAGE, AND HANDLING

        A.  Comply with Section 01 6000, Product Requirements.

        B.  Stack material to prevent twisting, bending, and abrasion,
            and to provide ventilation. Slope materials and components
            to ensure drainage.

        C.  Prevent contact with materials causing discoloration or
            staining.

    6.  ENVIRONMENTAL REQUIREMENTS

        A.  Do not apply gutter or downspout materials during inclement
            weather.

        B.  Do not apply gutter or downspout materials to damp or frozen
            surfaces.

    7.  QUALITY ASSURANCE

        A.  Perform work per SMACNA Architectural Sheet Metal Manual and
            NRCA Roofing and Waterproofing Manual.

    8.  FIELD MEASUREMENTS

        A.  Verify field measurements prior to fabrication.

    9.  WARRANTY

        A.  Furnish \[5\] \[ \] year manufacturer warranty for metal
            components against corrosion with an additional installers
            warranty for \[5\] years against fastener failure, water
            penetration at joints or failure to drain.

2.  PRODUCTS

    1.  Product options and substitutions

        A.  Comply with Section 01 2500, Product Options and
            Substitutions.

        B.  Manufacturers:

            1.  \[ \] Model \[ \].

        C.  Product Description:

            1.  Gutters, downspouts, conductor heads and scuppers: Sheet
                metal, \[\[rectangular\] \[square\] profile\]\[profile
                as indicated on Drawings.\]

    2.  SHEET METAL MATERIALS

        A.  Pre-Finished Galvanized Steel Sheet: ASTM A755 coil coated.

            1.  Base Metal: ASTM A653, zinc coating.

            2.  Exposed Finish: Silicone polyester or acrylic or
                electrolytic powder coating.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

3.  Exposed Finish: Minimum three coat fluoropolymer coating with
    minimum 70 percent polyvinylidene fluoride resin.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

4.  Unexposed Finish: Manufacturer's standard.

\*\*\*\*\* \[OR\] \*\*\*\*\*\*

B.  Galvalume Steel Sheet: ASTM A792, aluminum-zinc alloy coating.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

C.  Pre-Finished Galvalume Steel Sheet: ASTM A755 coil coated.

    1.  Base Metal: ASTM A792, aluminum-zinc alloy coating.

    2.  Exposed Finish: Silicone polyester or acrylic or electrolytic
        powder coating.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

3.  Exposed Finish: Minimum three coat fluoropolymer coating with
    minimum 70 percent polyvinylidene fluoride resin.

4.  Unexposed Finish: Manufacturer's standard.

5.  Splash Pads: Precast concrete type, with standard profile indicated;
    minimum 3000 psi at 28 days, with minimum 5 percent air entrainment.

6.  Downspout \[Boots\] \[Shoes\]: Metal identical to rest of system.

```{=html}
<!-- -->
```
3.  FABRICATION

    \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Design gutters and downspouts per LANL Engineering Manual, Mechanical
Chapter (plumbing), for rainfall rate specified. Size gutters sloped at
1/8 inch/foot to receive 2 times volume of water.\
\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

A.  Form sections as indicated in Drawings, accurate in size, square,
    and free from distortion or defects.

B.  Fabricate trim, flashing, and other metal components from same
    material as metal gutter sections. Provide exposed metal surfaces
    with same finish as exposed face of metal roof panels.

C.  Fabricate strap ties of compatible material as gutters, to interlock
    with gutter.

D.  Fabricate connector/expansion clips of same material as gutter that
    interlock with gutter by mechanical fastener or welding.

E.  Form gutter and downspout sections in longest practical lengths or
    in single length sheets where possible.

    1.  Gutters: Rectilinear in cross section unless otherwise
        indicated.

F.  Hem exposed edges on 1/2-inch miter.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Due to high coefficient of expansion, metal should not be lock seamed
where thermal induced movement of metal is restrained.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

G.  Provide expansion joints (slip joints) on gutters exceeding 50 feet
    in length

H.  Roof side gutter flange to extend continuously up fascia or wall and
    terminate under drip edge or gravel stop. Where this is not
    possible, flange to be lapped with flat sheet metal that begins
    under edge of roof sheathing or drip edge and laps over the sloped
    rear gutter flange. The rear gutter flange must be bedded, when
    applied on plumb fascias, in silicone sealant.

I.  Fabricate corners with 18 inch long legs. Weld mitered seam for
    rigidity, seal with sealant.

```{=html}
<!-- -->
```
J.  Install gutter connections per manufacturer's warranty requirements.
    Connections may be:

    1.  Soldered.

    2.  \[Riveted\] \[Screwed\] with sealant.

    3.  Profile Connectors: \[Riveted\] \[Screwed\] with sealant.

        K. Downspout collars on bottom of gutter trough must be
        \[soldered\] \[riveted\] \[screwed\] and sealed with sealant.

```{=html}
<!-- -->
```
4.  ACCESSORIES

    A.  Anchors and Supports: Profiled to suit gutters and downspouts.

        1.  Anchoring Devices: \[Per SMACNA requirements.\] \[Type
            recommended by fabricator.\]

        2.  Gutter Supports: \[Brackets.\] \[Straps.\] \[Screws and
            ferrules.\]

        3.  Downspout Supports: \[Brackets.\] \[Straps.\]

        4.  Fabricate gutter and downspout accessories; seal watertight.

    B.  Fasteners: Screws

        1.  For installations on wood framed structures through screwing
            is required with \[8\]-inch long galvanized or anodized
            screws within ferrules. Fastening to be at rafter tail
            locations with screws to penetrate both fascia and rafter
            tail.

        2.  For fastening directly through gutter cross section, use
            screws of suitable length made of compatible material and
            finish as gutters and downspouts, with neoprene gaskets.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Select protective backing paint or protective back coating appropriate
to flashing metal selected and compatible with adjacent materials. These
coatings are intended to prevent electrolytic reaction with other
materials in contact with flashing metal.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

C.  Primer: \[Zinc molybdate\] \[Galvanized iron\] \[Iron oxide linseed
    oil\] type.

D.  Protective Backing Paint: Zinc molybdate alkyd.

E.  Solder: ASTM B32, 50/50 type.

```{=html}
<!-- -->
```
5.  FACTORY FINISHING

    A.  Class I Natural Anodized Finish: AAMA 611, clear anodic coating
        not less than 0.7 mils thick.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

B.  Class II Natural Anodized Finish: AAMA 611, clear anodic coating not
    less than 0.4 mils thick.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

C.  Class I Color Anodized Finish: AAMA 611, integrally colored anodic
    coating not less than 0.7 mils thick.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

D.  Class II Color Anodized Finish: AAMA 611, integrally colored anodic
    coating not less than 0.4 mils thick.

\*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Paragraphs "E" and "F" below are for pre-finished steel sheet.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

E.  PVDF (polyvinylidene fluoride) Coating: Multiple coat, thermally
    cured, fluoropolymer system conforming to \[AAMA 2604\] \[AAMA
    2605\].

    \*\*\*\*\*\* \[OR\] \*\*\*\*\*\*

F.  Primer Coat: Finish concealed side of metal sheets with primer
    compatible with finish system, as recommended by finish system
    manufacturer when pre-finished materials are specified.

```{=html}
<!-- -->
```
3.  EXECUTION

    1.  EXAMINATION

        A.  Verify surfaces are ready to receive gutters and downspouts.

    ```{=html}
    <!-- -->
    ```
    1.  PREPARATION

        A.  Paint concealed \[metal\] \[wood\] surfaces and surfaces in
            contact with dissimilar metals with protective backing paint
            to minimum dry film thickness of 15 mil and bed with
            silicone sealant.

    2.  INSTALLATION

        A.  Roll Formed Gutter: Join lengths with formed seams
            \[sealed\] \[soldered\] \[mechanically fastened\]
            watertight. Flash and seal gutters to downspouts and
            accessories.

        B.  Install per manufacturer's instructions. If there is a
            conflict between Subcontract documents and manufacturer's
            instructions, comply with most stringent requirements.

        C.  Slope gutters 1/8 inch per foot minimum, 1/4 inch per foot
            preferred.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Delete the following paragraph when no soldered sheet metal is required.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

D.  Solder metal joints for full metal surface contact. After soldering,
    wash metal clean with neutralizing solution and rinse with water.

E.  Connect downspouts to \[boots\] or \[shoes\] at 8 inches above
    grade, seal connection watertight.

F.  Install gutters 3/4 inches below slope of roof at outside edge.

G.  Attach gutters to structure by both strap ties and by direct
    fastening through profile. Locate fasteners and strap ties a maximum
    of 24 inches on center.

H.  Locate downspouts per Drawings. \[or as field directed by LANL
    Subcontract Technical Representative (STR) (for retrofit work)\]

I.  Provide "open sided" downspouts to prevent gutter ice build-up.

J.  Strap fasten downspouts at maximum 30 inches on center.

K.  Do not locate downspouts with outflow creating an icing problem on
    pedestrian walkways.

L.  Set splash pans under downspouts when application puts outflow onto
    a flat roof below. Secure in place.

M.  Set splash pads under downspouts at grade and secure in place with
    soil or pins. Grade out flow soils to drainage area.

N.  Provide rip rap at downspout outflow, 6 inch nominal diameter stones
    secured in place where adjacent grade of soil exceeds 5 percent, or
    where volume and velocity of outflow will cause erosion.

END OF SECTION

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

Do not delete the following reference information:

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

FOR LANL USE ONLY

This project specification is based on LANL Master Specification 07 7123
Rev. 1, dated May 5, 2008.