A06_Snow_Guards.pdf

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DIVISION 7 Section 077253 Thermal and Moisture Protection SNOW GUARDS

PART 1 GENERAL

1.1 SUMMARY

A. Section Includes:

1. Rail-type, seam-mounted snow guards.

1.2 ACTION SUBMITTALS

A. Product Data: Include construction details, material descriptions, dimensions of individual components and profiles, and finishes.

B. Shop Drawings: Include roof plans showing layouts and attachment details of snow guards.

1. Include details of rail-type snow guards.

C. Samples:

1. Rail-Type Snow Guards: Bracket, 12-inch- long rail, and installation hardware.

a. For units with factory-applied finishes, submit manufacturer's standard color selections.

D. Delegated Design Submittals: For snow guards, include analysis reports signed and sealed by the qualified professional engineer responsible for their preparation.

1. Include calculation of number and location of snow guards.

1.3 INFORMATIONAL SUBMITTALS

A. Qualification Data: For professional engineer's experience with providing delegated design engineering services of the kind indicated, including documentation that the engineer is licensed in the state in which the Project is located.

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B. Product Test Reports: For each type of snow guard, for tests performed by a qualified testing agency, indicating load at failure of attachment to roof system identical to roof system used on this Project.

1.4 FIELD CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit adhesive-mounted snow guards to be installed, and adhesive cured, according to adhesive manufacturer's written instructions.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Delegated Design: Engage a qualified professional engineer, as defined in Section 014000 "Quality Requirements," to design snow guards, including attachment to roofing material and roof deck, as applicable for attachment method, based on the following:

1. Roof snow load.

2. Snow drifting

3. Roof slope.

4. Roof type.

5. Roof dimensions.

6. Roofing substrate type and thickness.

7. Snow guard type.

8. Snow guard fastening method and strength.

9. Snow guard spacing.

10. Coefficient of Friction Between Snow and Roof

Surface: 0.

11. Factor of Safety: 2.

B. Performance Requirements: Provide snow guards that withstand exposure to weather and resist thermally induced movement without failure, rattling, or fastener disengagement due to defective manufacture, fabrication, installation, or other defects in construction.

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1. Temperature Change: 120 deg F, ambient; 180 deg F, material surfaces.

C. Structural Performance: Snow guards to withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated.

1. Snow Loads: As indicated on Drawings.

2.2 RAIL-TYPE SNOW GUARDS

A. Rail-Type, Seam-Mounted Snow Guards:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

a. Alpine SnowGuards.

b. Berger; division of OmniMax International, Inc.

c. IceBlox Inc.

d. LMCurbs.

e. PMC Industries, Inc.

f. Rocky Mountain Snow Guards, Inc.

g. S-5! Metal Roof Innovations, Ltd.

h. TRA Snow and Sun, Inc.

2. Description: Snow guard rails fabricated from metal pipes, bars, or extrusions, anchored to brackets and equipped with three rails with integral track to accept color-matching inserts of material and finish used for metal roof.

3. Brackets and Baseplate: ASTM B209 aluminum;

mill finished.

4. Bars: ASTM B221 aluminum; mill finish.

a. Profile: with integral track to accept color-matching inserts of material and finish used for metal roof.

5. Seam Clamps: ASTM B221 aluminum extrusion or ASTM B85/B85M aluminum casting with stainless steel set screws http://www.specagent.com/LookUp/?ulid=6879&mf&src=wd http://www.specagent.com/LookUp/?uid=123457147583&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147584&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147584&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147587&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147580&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147588&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147589&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147581&mf=04&src=wd http://www.specagent.com/LookUp/?uid=123457147585&mf=04&src=wd

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incorporating round nonpenetrating point; designed for use with applicable roofing system to which clamp is attached.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates and conditions, with Installer present, for compliance with requirements for installation tolerances, snow guard attachment, and other conditions affecting performance of the Work.

1. Verify compatibility with and suitability of substrates, including compatibility with existing finishes or primers.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Clean and prepare substrates for bonding snow guards.

B. Prime substrates according to snow guard manufacturer's written instructions.

3.3 INSTALLATION

A. Install snow guards according to manufacturer's written instructions.

1. Space rows as recommended by manufacturer.

B. Attachment for Standing-Seam Metal Roofing:

1. Do not use fasteners that will penetrate metal roofing or fastening methods that void metal roofing finish warranty.

2. Rail-Type, Seam-Mounted Snow Guards:

a. Install brackets to vertical ribs in straight rows.

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b. Secure with stainless steel set screws, incorporating round nonpenetrating point, on same side of standing seam.

c. Torque set screw in accordance with manufacturer's written instructions.

d. Install cross members to brackets.

END OF SECTION 077253