Roof Hatches

SECTION 07 72 33

ROOF HATCHES

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Metal roof hatches with integral curbs.

1.2 RELATED SECTIONS

A. Section 05 12 00 - Structural Steel Framing: Roof structure and opening support.

B. Section 05 55 00 - Metal Stair Treads and Nosings: Miscellaneous metal supports.

C. Section 06 10 00 - Rough Carpentry: Roof framing and opening support.

D. Section 07 42 00 - Wall Panels: Roof curb flashing.

1.3 REFERENCES

A. OSHA 1910.23: Ladders.

B. OSHA 1910.28: Duty to have fall protection and falling object protection.

1.4 SUBMITTALS

A. Submit under provisions of Section 01300.

B. Manufacturer's data sheets on each product to be used, including:

1. Preparation instructions and recommendations.

2. Storage and handling requirements and recommendations.

3. Installation methods.

C. Shop Drawings for Roof Hatches:

1. Plan and section of stair installation.

2. Indicate rough opening dimensions for ceiling and/or roof openings.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Store roof hatch until installation inside under cover in manufacturer's unopened packaging. If stored outside, store under a tarp or suitable cover.

1.6 WARRANTY

A. Limited Warranty: Five years against defective material and workmanship, covering parts only. Defective parts, as deemed by the manufacturer, will be replaced at no charge, freight excluded, upon inspection at manufacturer's plant.

PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Acceptable Manufacturer: Precision Ladders, LLC, which is located at: P. O. Box 2279; Morristown, TN 37816-2279; Toll Free Tel: 800-225-7814; Tel: 423-586-2265; Fax: 423-586-2091; Web: www.PrecisionLadders.com

B. Requests for substitutions will be considered in accordance with provisions of Section 01600.

2.2 METAL ROOF HATCHES WITH INTEGRAL CURB

A. Metal Roof Hatches with Integral Curb and Components: Curb, cover, pressure control, hardware, and finishes.

1. Models: Model PH-G**** [****= opening size in feet and inches; for example PH-G2630 is PH-G 2’6” x 3’0” (762 mm x 914 mm)] for a galvanized steel roof hatch or PH-A**** [****= opening size in feet and inches; for example PH-A2630 is PH-A 2’6” x 3’0”(762 mm x 914 mm)] for an aluminum roof hatch. Roof Hatch as manufactured by Precision Ladders, LLC.

2. Capacity: Cover shall be reinforced to support a minimum live load of 40 psf (195kg/m²) with a maximum deflection of .67% of the span and a 20 psf (97 kg/m²) wind uplift for galvanized steel (Model PH-G) and aluminum (Model PH-A) roof hatches.

3. Performance Characteristics: Operation of the cover shall be smooth and easy with controlled operation throughout the entire arc of opening and closing. Operation of the cover shall not be affected by temperature. Entire hatch shall be weather tight with fully welded corner joints on cover and curb.

4. Performance Standard: Unit shall comply with OSHA 1910.23 and OSHA 1910.28.

B. Components:

1. Curb

a. Formed from 14 gauge galvanized steel of lock forming quality per ASTM A-525 with G90 coating (.090 Aluminum H-14 3003 on aluminum models).

b. Sheathed with 1" (25 mm) of rigid fiber board insulation.

c. Height of 12" (305 mm) unless indicated otherwise on drawings.

d. 4" (102 mm) integral flange for securing to roof.

e. Hinges connecting curb to door shall be 1/8" (3.175 mm), 2 piece formed steel with 3/8 (9.525 mm) pivot pin.

f. Extruded rubber gasket within a 20 gauge extruded aluminum track shall be securely attached to the frame to make the unit weathertight.

2. Cover

a. Formed from 14 gauge galvanized steel of lockforming quality per ASTM A-525 with G90 coating (.090 Aluminum H-14 3003 on aluminum models).

b. Liner shall be 22 gauge galvanized steel with G90 coating (.040 Aluminum H-14 3003 on aluminum models).

c. Insulation between cover and liner to be 1" (25 mm) thick U.L. plain fiberglass 0.75# density.

d. Lid shall be reinforced as required with 11 ga. steel channel (.090 Aluminum H-14 3003 on aluminum models).

e. A one point cab lock is to be provided with a built-in inside handle on units with a length of 4' 6" (1372 mm) or less. On units of greater length, a 2 point slam lock will be used.

f. Exterior of cover shall be devoid of hardware with the exception of the outside handle.

g. Outside handle shall be vinyl coated, steel T-handle.

h. Automatic hold-open device shall be formed from 3/16" (4.76 mm) steel flat bar and 1/2" (12.7 mm) diameter steel round stock with a vinyl grip.

i. Padlock provisions provided on both interior and exterior of unit.

j. Extruded rubber gasket shall be securely attached to the liner, thus providing a weather-tight seal.

3. Pressure Control: Opening/closing assistance/resistance shall be provided with spring-loaded pressure intensifiers consisting of a telescoping tube; the top (outer) tube shall be 1 5/16" (33.34 mm),bottom (inner) tube shall be 1 1/2" (38.1 mm). Tubes shall be cadmium plated and chromate-sealed.

4. Hardware: Corrosion resistant hardware and fasteners is standard.

5. Finish: Red oxide primer OR Mill finish aluminum

C. Accessories:

1. Precision Safety Access Handrail, mounted to outside corner of hatch curb, to provide a fixed hand hold assist when entering or exiting the hatch.

2. Precision Extend-A-Rail, to be mounted to hatch access ladder, to provide a retractable hand hold assist when entering or exiting the hatch.

3. Precision Aluminum Guard Rail System with self-closing gate, mounted to exterior of hatch, to protect the roof opening.

2.3 FABRICATION

A. Completely fabricate roof hatch ready for installation before shipment to the site.

PART 3 EXECUTION

3.1 EXAMINATION

A. Do not begin installation until rough opening and structural support have been properly prepared.

B. If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

C. Examine materials upon arrival at site. Notify the carrier and manufacturer of any damage.

3.2 INSTALLATION

A. Install in accordance with manufacturer's instructions and approved submittals.

3.3 PROTECTION

A. Protect installed products until completion of project.

B. Touch-up, repair or replace damaged products before Substantial Completion.

END OF SECTION