Homasote Easy-ply Roof decking

USES
Homasote Easy-ply® Roof Decking is designed for use as a structural, load-bearing decking in residential and non-residential buildings, room additions, A-frames and log homes for exposed beam construction. Easy-Ply Roof Decking comes with a 6 mil pre-finished surface of a decorative white "flitter" vinyl film. By adding Thermasote® Nail Base Roof Insulation to the Easy-Ply Roof Decking, insulation values up to R-32 plus can be achieved. See Sheet No. RD-8-132-6. Easy-ply Roof Decking is not recommended for use over swimming pools or similar areas.

SIZES, WEIGHTS AND THERMAL RESISTANCE
Thickness Nom.: 1"
Size: 2' x 8' (23-1/8" x 95-7/8" actual)
Weight lbs./sq. ft.: 2.4
R Value: 2.4
Thickness Nom.: 1-3/8"
Size: 2' x 8' (23-1/8" x 95-7/8" actual)
Weight lbs./sq. ft.: 3
R Value: 3.27
Thickness Nom.: 1-7/8"
Size: 2' x 8' (23-1/8" x 95-7/8" actual)
Weight lbs./sq. ft.: 4
R Value: 4.46
Thickness Nom.: 2-1/16"
Size: 2' x 8' (23-1/8" x 95-7/8" actual)
Weight lbs./sq. ft.: 5
R Value: 5.0
2' edge square
8' edge square has T&G

FIRE RESISTANCE RATINGS
ASTM E-84: Easy-ply (Flitter Vinyl)
Class: C
Flame Spread: 100
Smoke Developed: 230
Also available in Class "A" rated Firestall® Roof Decking (natural finish only).

LOAD TABLE
Panel Thickness: 1"
Max. Rafter Spacing for Live Loads of:*
40PSF: 24"
50PSF: 16"
A-Frame: 32"

Panel Thickness: 1-3/8"
Max. Rafter Spacing for Live Loads of:*
40PSF: 32"
50PSF: 24"
A-Frame: 48"

Panel Thickness: 1-7/8"
Max. Rafter Spacing for Live Loads of:*
40PSF: 48"
50PSF: 32"
A-Frame: 48"

Panel Thickness: 2-1/16"
Max. Rafter Spacing for Live Loads of:*
40PSF: 48"
50PSF: 48"
A-Frame: 48"

Spans are limited by 1/180 deflection expressed in lbs. per square foot of roof area projected on a horizontal plane and over two or more spans. 10 PSF dead load assumed.

CODE COMPLIANCES
FHA Materials Release No. 1150a
ICBO Report No. 1016
SBCC Report No. 8653

ARCHITECTURAL SPECIFICATION (short form)
All structural roof panels shall be _____ thick Easy-ply Roof Decking as manufactured by the Homasote Company, West Trenton, NJ, and installed in accordance with current Homasote Company instructions.

FASTENING SPECIFICATIONS
Easy-ply Roof Decking can be applied to a wood or steel framing structure.

ROOFING APPLICATION
Most types of finish roofing materials can be applied directly to Easy-ply Roof Decking including Asphalt/Fiberglass Shingles, Wood Shingles or Shakes, Roofing Tiles or Slate, Built up roofing, Single ply membranes and Metal Roofing.

INSTALLATION REQUIREMENTS
Moisture protection is the responsibility of the contractor. Easy-ply Roof Decking must be protected from weather and/or standing water at all times. No moisture from any source should be sealed into a roof system. Roofing felts, insulation, or vapor retarders that become wet or water-laden during construction should be removed and replaced before the application of finish roofing materials. Install in a dry condition only. Follow immediately with application of roofing felt and finish roofing.

PACKAGING, STORAGE AND PROTECTION
Easy-Ply Roof Decking comes to the job site in weather-resistant, plastic covered units. However, all materials should be stored at job site above ground on wooden pallets and covered by tarpaulins. Packaging material is not intended for exterior job site protection.

AVAILABILITY
Homasote products, samples and technical literature are available throughout the United States and Canada. Contact your local building material dealer, roofing distributor, or write to Homasote Company, P.O. Box 7240, West Trenton, NJ 08628-0240.

HOMASOTE EASY-PLY®
ROOF DECKING –
THERMASOTE®
ROOF INSULATION SYSTEM

SYSTEM DESCRIPTION
This system consists of an application of EASY-PLY ROOF DECKING plus a subsequent application of THERMASOTE Nail Base roof insulation.

EASY-PLY ROOF DECKING is made of various plies of high density Homasote structural building board laminated together to form structural roof panels.

THERMASOTE is a composite of a layer of nail base Homasote plus poly isocyanurate foam with a fiberglass felt facer.

Homasote Easy-ply Roof Decking Sizes (nominal 2' x 8')
Thickness: 1"
Width: 23-1/8"
Length: 95-7/8"
Weight lb./sq. ft.: 2.4
"R" Values: 2.40

Thickness: 1-3/8"
Width: 23-1/8"
Length: 95-7/8"
Weight lb./sq. ft.: 3
"R" Values: 3.27

Thickness: 1-7/8"
Width: 23-1/8"
Length: 95-7/8"
Weight lb./sq. ft.: 4
"R" Values: 4.46

Thickness: 2-1/16"
Width: 23-1/8"
Length: 95-7/8"
Weight lb./sq. ft.: 5
"R" Values: 5.00

Long edges are T&G with a V-groove on the ceiling side.

FINISH

Easy-Ply Roof Decking has a 6 mil prefinished surface of a decorative white "Flitter" vinyl film which serves both as interior finish and a vapor barrier. Not recommended over swimming pools or similar areas. Decking is also available in natural grey for non vapor barrier application.

GENERAL REQUIREMENTS

Keep wrapped in weather-capped shipping units until ready for use. Protect open units with polyfilm. Roof decking must be installed in a dry condition only; follow installation immediately with application of roofing felt. Wet decking must be allowed to dry thoroughly before applying finish roofing materials.

Where Roof Decking will be secured with nails, use size and quantities recommended in the "Application Recommendations."

Edges of all cuts made for fitting, clearance holes or other openings should be primed with a quality primer-sealer and caulked. Fill open areas with approved insulation at ridge, around chimneys, vents or other projections. Cap the ridge and flash other openings according to normal roofing practice and local code requirements.

Provide a gap of 1/8" between squared end butt joints and caulk joints. Trim panel length if necessary to provide gap. Stagger all end joints.

PREFAB ROOF TRUSSES

Apply wood purlins, of sufficient strength for rafter span, securely across rafter trusses. Space purlins according to the thickness of the Roof Decking to be used as recommended in the "Rafter Spacing" chart. Starting at low point of roof, position Roof Decking panels across wood purlins with long edges 90° to purlins. Stagger butt joints on alternate purlins. Use a cut-off piece of Roof Decking and a heavy hammer to drive T&G edges tight.

A-FRAME AND POST AND BEAM STRUCTURES

Easy-Ply Roof Decking is an economical, labor-saving roof sheathing, particularly ideal for these types of buildings; a weather-resistant structural decking that provides a decorative, vapor-barrier film for a completely pre-finished ceiling as well as a base for THERMASOTE nail-base supplemental roof insulation and/or a wide variety of finish roofing materials. To protect finished Roof Decking for exposed beam structures, it is recommended that polyethylene film be applied to beam tops before installing Roof Decking. After staining or painting the beams, the polyethylene film can be removed by slitting each side of the beam. If beams are stained or painted before installing Roof Decking, wipe beam tops clean to protect Roof Decking finish.

Use appropriate thickness of Roof Decking to meet rafter span requirements as shown in the "Rafter Spacing" chart. Install Roof Decking panels with long edges at right angles to rafters, starting at low point of framing, with tongue of T&G pointing to ridge and finish (ceiling) side down on rafters. Start second and following courses on alternate rafters to stagger end joints. Use a cut-off piece of Roof Decking and a heavy hammer to drive T&G edges tight. Allow 1/8'' gap at butt joints and caulk as illustrated.

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.

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 ON FRAMING MEMBERS]

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.
2. On bulb-T framing, apply a good grade primer to long edges. Keep paint off film. If necessary, wipe clean with mineral spirits.
3. Apply a good grade primer to all cut edges and holes.
4. Caulk with a good grade sealant.
a. Apply a continuous bead of caulking to the T&G groove.
b. Apply a continuous bead of caulking to the squared ends. Gap butt ends 1/8". Trim ends if necessary. All butt joints must fall on framing members.
c. Fill voids around cutouts with insulation and caulk-seal at ridge, around chimney, vents or other openings.
5. Assure continuity of vapor barrier by taking special care in handling panels to avoid damaging or puncturing vapor barrier finish films.

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. 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.
Nailing – Nail directly to wood rafters, or beams, with nails specified in rafter spacing section. Nail from panel center out to ends, using five nails per rafter. (Check "Rafter Spacing And Nail Requirements" section below). Keep nails back 3/4" from edges.
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 AND TEST DATA
F.H.A. Material Release No. 1150/c
S.B.C.C. Report No. 9590
I.C.B.O. Report No. 1016
U. Miami Wind Up-Lift Test No. 1278

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: 1"
Rafter or Purlin Spacing for Allowable Live Load of: 50 psf – 24" o.c.
Nails, Galv. Common Size: 6d
Profile Clip to Bar Joists: N.A.

Roof Decking Thickness: 1-3/8"
Rafter or Purlin Spacing for Allowable Live Load of: 50 psf – 32" o.c.
Nails, Galv. Common Size: 8d
Profile Clip to Bar Joists: 6380

Roof Decking Thickness: 1-7/8"
Rafter or Purlin Spacing for Allowable Live Load of: 50 psf – 48" o.c.
Nails, Galv. Common Size: 10d
Profile Clip to Bar Joists: 6780

Roof Decking Thickness: 2-1/16"
Rafter or Purlin Spacing for Allowable Live Load of: 50 psf – 48" o.c.
Nails, Galv. Common Size: 16d
Profile Clip to Bar Joists: 6780

* Spans are limited by 1/180 deflection expressed in lbs. per square foot of root area projected on a horizontal plane and over two or more spans. 10 psf 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.

ROOF DECKING APPLICATION RECOMMENDATIONS

1. To avoid double handling, panels of Homasote Roof Decking should be unloaded from truck directly to the roof, wherever possible. They should be set on roof framing at approximate points of use. All panels should be handled carefully to avoid damage to finished side, edges and ends. They should be protected from elements prior to application.

2. Avoid waste and irregular joints by measuring roof area and planning layout in advance. For example, rip the starter course to provide equal width courses at ridge (top course) and eaves (bottom course) rather than wide at bottom and narrow at top or vice versa. Always keep length of panel at right angle to framing members.

3. Where wood beams are to be exposed and stained or painted, mask top of beam with wide strip of waxed paper or polyethylene held down by staples. This avoids marring of roof deck finish. After painting, slit waxed paper flush along beam and remove.

4. Homasote Roof Decking saws easily and cleanly with either a hand saw or power saw. If hand saw is used, keep finished side up; for power sawing, finished side should be down and handled carefully to protect against scraping and soiling.

NOTE: All Butt Joints Must Fall On Framing Members.

5. Starting at low or outside edge of roof, lay the first course of panels along the entire roof edge. Tongue should face ridge. Check course for straightness. Nail with galvanized Common Nails as follows: for 1" thick panel, use 6d nails; for 1-3/8" thick panel, use 8d nails; for 1-7/8" thick panel, use 10d nails; for 2-3/8" thick panel, use 16d nails. Use 5 nails per rafter, 4-1/2" o.c. and back 3/4" from edges. Work from center of panel to ends.

6. First course should be laid completely along the roof edge. Follow with next courses having end joints staggered. Bring long edges together into a snug fit by hammering a block of wood against the top edge of panels, before nailing. Ends and tongue and groove joints should be sealed against penetration of indoor air and moisture by applying a bead of caulking compound, leave 1/8" gap at butt joints.

NOTE: 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.

7. Around chimneys and other projections cut roof decking same as for wood construction following local code requirements. Prime and caulk cut edges. Fill space between roof deck and chimneys or other projections with approved insulation. Finish with flashing and collar as in regular procedure.

8. If NATURAL decking is to be used as exposed exterior overhang, apply good quality exterior paint to the exposed underside exactly as with wood. If a soffit is used and overhang is boxed, space between rafters should be vented. Caulk, as needed, against possible moisture penetration. If VINYL-SURFACED DECKING is used it is not necessary to paint exposed surface.

Thermasote® Nailbase for Supplemental Roof Insulation

THERMASOTE® is a composite of strong, asbestos-free insulating and weather-resistant HOMASOTE® structural building board plus polyisocyanurate form and a bottom surface of asphalt saturated felt, fibrous glass, or foil.

Homasote Easy-Ply® Roof Decking, used in conjunction with Thermasote®, will provide a 15-minute thermal barrier protection, following ASTM E-119 criteria (Factory Mutual Research Test Serial No. 2760) and insulation values to R32 + are possible.

THERMASOTE®

Thickness (nominal): 2.0"
Size (nominal): 4' x 8'
Aged R-Value: 11.1

Thickness (nominal): 3.0"
Size (nominal): 4' x 8'
Aged R-Value: 18.2

The thermal value of this product was determined in accordance with the TIMA conditioning procedure as outlined in PIMA Tech. Bulletin 101.

NAILING

1. Apply wood nailers of same thickness as THERMASOTE® to all eave and rake edges of roof as starter strip and nailing for trim and fascia.

2. Cover all roof decking with felt paper prior to application of Thermasote.

3. Starting at the low or outside edge of the roof, place the panel on the deck and nail 6" o.c. at the panel edges and 12" through the field with HOMASOTE NAIL (3/8" Head, Annular Thread) of sufficient length to penetrate 1" into the deck (See Nail Chart). Stagger all panels.

4. Place the next panel lightly abutting previous panel.

As THERMASOTE® is applied follow immediately with application of required felt paper and finish roofing.

ROOFING APPLICATION*

1. Asphalt/Fiberglass Shingles – Apply roofing felt and asphalt/fiberglass strip shingles directly to the THERMASOTE® panels.

Use Homasote Nail No. 2125 (3/8" head, 1-1/4" long, annular threaded, galvanized), Bostitch Nail No. CR3DGAL (3/8" head, 1-1/4" long) shot with N12B Roofing Nailer, or Senco Staple No. P17BAB (1" crown, 1-1/2" long, 5562 galvanized wire with Sencoting) shot with the appropriate Senco stapler.

*NOTE: Homasote Company requires the use of a premium or laminated roofing shingle over ROOF DECK and THERMASOTE®. The shingle must have a minimum weight of 240 lbs. per square.

2. Wood Shingles or Shakes – For wood shingles, attach roofing felt to the THERMASOTE® and apply shingle directly over the roofing paper with annular threaded, corrosion-resistant nails of sufficient length to penetrate 1" into the THERMASOTE®. Apply shingles following the procedure outlined by the Cedar Wood Shingle Mfg. Association.

3. Roofing Tiles or Slate – For rigid-type, non-wood, cement, clay tile, or slate shingles over roofing felt, use corrosion-resistant annular threaded roofing nails with 3/8" diameter head and of sufficient length to assure 1" penetration into the THERMASOTE®. In all cases, follow the recommendations of the roofing materials manufacturer.

4. BUR – Apply according to BURSI standards for attachment to wood fiber insulation.

5. Single-Ply Membranes – Apply to THERMASOTE® in accordance with single-ply manufacturer’s recommendation. Consult Homasote Company for most recent single-ply manufacturer’s approval list.

6. Metal Roofing – Contact Homasote Company for metal roofing application recommendations.

*If supplemental insulation is not desired, felt and finish roofing may be applied directly to Roof Decking

NAILS FOR THERMASOTE® APPLICATION

Thickness: 2.0
Nail No.: 2350
Req’d./100 s.f.: 2.3 lb.

Thickness: 2.5
Nail No.: 2350
Req’d./100 s.f.: 2.3 lb.

Thickness:3.0
Nail No.: 2450
Req’d./100 s.f.: 3.3 lb.

Thickness: 4.0
Nail No.: 2500
Req’d./100 s.f.: 7.4 lb.

Thickness: 3.0
Nail No.: 2400**
Req’d./100 s.f.: 2.7 lb.

**For application of 3" Thermasote to 1-3/8" Easy-Ply.

BONDED BUILT-UP ROOFING APPLICATION

Homasote Roof Deckings, as described above, are acceptable surfaces for Built-Up Roofing when the following requirements are met:

1. Slope of roof must be not less than 1/4" per foot nor more than 3" per foot.

2. Free drainage must be provided at all points.

3. Wood nailers of same thickness as decking and at least 3-1/2" wide must be provided at all edges and around all openings cut in the decking. Top of nailers must be flush with top of Homasote Roof Decking and fastened securely to wood framing.

Built-Up roofing is applied directly to the top surface of Homasote Roof Decking using nailable method. First two courses of paper are applied with "Square-Head" nails or Homasote Nail 2125 with tin caps. Follow roofing material manufacturer’s directions.

Application of built-up roofing materials must be in accordance with manufacturer’s specifications and any other requirements he may establish.

Caution:
No moisture from any source should be sealed into a roof system. Roofing felts, insulation or vapor retarders that become wet or water-laden during construction should be removed and replaced before the application of finish roofing materials.

AVAILABILITY

Homasote products, samples and technical literature are available throughout the United States and Canada. Contact your local building material dealer, roofing distributor, or write to Homasote Company, P.O. Box 7240, West Trenton, NJ 08628-0240.

homasote
COMPANY
P.O. Box 7240
West Trenton, NJ 08628-0240
1-800-257-9491
Ph: (609) 883-3300
Fax: (609) 530-1584