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Homasote Co.
Recycled Building Products\Roof Deck
Easy-ply Roof Decking - page 4
Recycled Building Products\Roof Deck
VAPOR BARRIER
CONTINUITY
Easy-Ply Roof Decking is laminated with a decorative 6 mil vinyl which is a vapor barrier and interior finish. Not recommended over swimming pools or similar areas.
ALL BUTT JOINTS
MUST FALL |
The following instructions for priming, caulking and sealing must be followed to assure complete vapor barrier continuity. To assure optimum effectiveness of the Roof Decking vapor barrier, ALL joints, and holes for chimneys, vents or other openings cut through the Roof Decking, must be properly sealed. Proper sealing is simple and can be conducted during the normal procedure of installing the Roof Decking.
(1) |
Apply a good grade primer to the ends of each panel before application. Keep paint off film. If necessary, wipe clean with mineral spirits. |
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(2) |
On bulb-T framing, apply a good grade primer to long edges. Keep paint off film. If necessary, wipe clean with mineral spirits. |
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(3) |
Apply a good grade primer to all cut edges and holes. |
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(4) |
Caulk with a good grade sealant.
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(5) |
Assure continuity of vapor barrier, by
taking special care in handling panels to
avoid damaging or puncturing vapor
barrier finish films. |
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INSTALLATION
INSTRUCTIONS
Preparation - Avoid marring or soiling of factory-finished panels. In exposed beam construction, apply masking paper to tops of beams before installing Roof Decking. After painting or staining beams, remove masking by slitting on each side of beam (See Fig. 3). If beams are finished before Roof Decking is applied, wipe away paint or stain runover from beam tops and allow to dry thoroughly before applying roof decking.
Sawing -Saw cuts are made easily with handsaws or power saws. Keep finished (ceiling) side face up for handsaws, face down for power saws. (See Fig. 4)
Nailing-Nail directly to wood rafters, or beams, with nails specified in rafter spacing table. Nail from panel center out to ends, using five nails per rafter. (Check table.) Keep nails back 3/4 " from edges. (See Fig. 5)
Installation -Starting at low or outside edge of roof, lay entire first course at right angle to framing with tongue pointing up to ridge and finished (ceiling) side down on rafters. Provide a 1/8" gap for caulking between end joints. Install second and following courses with butt joints on alternate rafters. Fit T & G snug. Stagger all panels.
Panel ends must not project beyond framing at roof edges. If decking is used as overhang, it must be supported at all outside edges and/or ends with additional framing members.
Finishing - Cut Roof Decking to fit at ridge, around chimneys and other projections according to local code requirements for wood construction. Cut edges should be caulked and open areas filled with approved insulation. Cap ridge and finish other openings with flashing.
BUILDING CODE COMPLIANCES
& TEST DATA
F.H.A. Material Release No. 1150/c Test March 1963, April 1963 and April 1964 References: Pennsylvania State University Flame Spread-Class III (or C) |
RAFTER SPACING AND NAIL REQUIREMENTS
ROOF DECKING THICKNESS |
RAFTER OR
PURLIN
SPACING FOR |
NAILS, GALV. COMMON |
PROFILE CLIP TO BAR JOISTS |
50 pst |
Nail Size |
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1" |
24" o.c. |
6 d. |
NA |
1 3/8" |
32" o.c. |
8 d. |
6380 |
1 7/8" |
48" o.c. |
10 d. |
6780 |
2 1/16" |
48" o.c. |
16 d. |
6780 |
*Spans are limited by 1/180 deflection expressed in lbs. per square toot of roof area projected on a horizontal plane and over two or more spans. 10 pst dead load assumed.
Start at middle of panel and drive 5 nails, equally spaced (4 1/2" o.c.). Alternately nail into rafters right and left of center. Keep nails back 3/4' from edges, toenailing if necessary.