Homasote 4-way® Floor Decking And Structasote

DESCRIPTION
Homasote 4-Way® Floor Decking is a structural, noise-deadening sub-floor and insulating, carpet underlayment. It consists of multiple plies of Homasote structural Building Board permanently bonded together to form easy handling 2' x 8' or 4' x 8' (nominal) panels. Panels are made in two thicknesses for application to joists spaced 16" or 24" o.c.

USES
Floor Decking is used as a structural sub-flooring in low-rise condominium and apartment developments, motels, nursing homes, professional buildings and private homes, especially where control of noise is a prime consideration.

MATERIAL
Floor Decking is made of Homasote insulation board which is a homogenous, 100% recycled, all wood fiber material processed with moisture-resistant ingredients, chemically treated for termite, rot and fungus protection and compressed into high density structural panels. Panels are bonded together with a water-resistant glue under extreme pressure, trimmed to size and shaped with T&G to form Floor Decking panels.

ADVANTAGES
Homasote 4-Way® Floor Decking has been laboratory tested for acoustical ratings using ISO, R140 and HUD test methods. The resilient surface provides in-place, wall-to-wall underlayment that will protect carpeting and prolong life beyond the ability of concrete or hardwood surfaces. Homasote 4-Way® Floor Decking is moisture-resistant and protected against termites, rot and fungi. Homasote annular thread nails, No. 3190, (3" long, 9 ga., annular threaded shank, 3/8" head), are available for glue-nail application.

Floor Decking adequately supports uniform live loads up to 100 lbs./square foot based on a maximum deflection of 1/360 of the span.

SIZES
Panel thickness (nominal) : 1-11/32"
Size (nominal): 2' x 8' or 4' x 8' *
Weight/sq. ft.: 3.0 lb.
Joists: 16" o.c.

Panel thickness (nominal) : 1-3/4"
Size (nominal): 2' x 8' or 4' x 8' *
Weight/sq. ft.: 4.1 lb.
Joists: 24" o.c.

Panel thickness (nominal): 1-11/32" **
Size (nominal): 2' x 8' or 4' x 8' *
Weight/sq. ft.: 3.6 lb.
Joists: 24" o.c.

*Actual sizes: 1' 11-1/8" x 7' 11-7/8" or 3' 11-1/8" x 7' 11-7/8"
**Structasote Floor Deck

All Homasote 4-Way® Floor Decking finished T&G on long edges and square on ends. Estimate 65 panels (2' x 8') or 32 panels (4' x 8') per 1000 sq. ft. of floor.

PHYSICAL DATA
Density, lb./ft.³: 26-28
Tensile, parallel to surface, psi (min.): 450-700
Transverse, MOR, psi (min.): 750-1000
Stiffness, MOE, psi (min.): 86,000
Hardness, Janka Ball lbs. (min.): 230
Expansion from 50% to 90% rel. hum. (max.): 0.25%
Water Absorp. (max.)*
2 hr. immers. % by vol – 5
24 hr. immers. % by vol – 15
R-Value 1-11/32": 3.27
R-Value 1-3/4": 4.46
Flame spread: Class III (or C)
*sample size tested 1/2" x 12" x 12"

OTHER TEST DATA
NAHB Research Foundation, Glue-nail Structural Tests, March, 1971.
S. B. Barnes & Assoc., Horizontal Diaphragm Test, 1972
Fire Rated: 1 hr. – per Factory Mutual Test
Design F. C. 77 – 1 hr. S/N 16738-40

BUILDING CODES
S.B.C.C. Report 8653
I.C.B.O. Report 1016
F.H.A. Materials Release 1150c
C.M.H.C. Report No. 11924

ARCHITECTURAL SPECIFICATION (short form)
All floor deck as shown in drawings shall be Homasote 4-Way® Floor Decking, 1-11/32" thick, or 1-3/4" thick as indicated, manufactured by the Homasote Company, West Trenton, N.J. and installed in accordance with current Homasote instructions.

GENERAL CONSTRUCTION DATA
Illustrated, step by-step instructions are given in Homasote Bulletin FD-8-222-5 which details construction requirements and Homasote approved installation procedure. The following information is intended only for product evaluation.

Construction Site Storage – Protect Floor Decking, as any valuable building product, by storing on a dry platform under shelter. Keep wrapped in weather-capped shipping units until ready to use. If no shelter is available, stack units on skids, 8" above grade. Panels must be installed in a dry condition. Every effort should be made to prevent water ponding on exposed floor decking.

Framing – Use cross bridging to secure floor joists. Solid bridging is not recommended. Ends of Floor Decking must bear on solid framing without breaks and at all points where framing changes direction. Wall and partition plates can be applied directly over Floor Decking, across floor joists. If partition parallels floor joists, adequate support framing must be installed under partition plate.

Installation – Homasote 4-Way® Floor Decking must be installed to accommodate expansion and contraction. In large area platforms, provide 1/2" gap for every 50' of length. Trim ends if necessary to assure support. Provide 1/2" gap at all abutting masonry walls. Stagger end joints on alternate joists. Do not butt squared ends tightly. Gap 1/16" to 1/8". Snug all T&G edges together tightly.

Adhesive is recommended with annular threaded nails in application of Floor Decking to effectively cut noise transmission through nails and to provide a stronger, squeak-resistant floor.

Glue-nail method – Apply continuous 3/8" beads of APA approved decking adhesive to enough framing for installing one or two panels at a time. Apply two parallel beads to joists supporting butt joints. Apply a continuous bead into groove of Floor Decking T & G.

Position panel and drive three (for 2' wide panels) or five (for 4' wide panels) Homasote No. 3190 nails (3" long, 3/4" dia. head, annular threaded) into centers of each joist, starting at mid-panel and nailing out to ends. Keep nails back 3/4" from ends, toenailing if required.

Nail each Floor Decking panel completely before proceeding to the next.

Complete nailing of the panels within the glue manufacturer’s specified time limit.

All nails must be dimpled 1/16" below surface.

APA APPROVED DECKING ADHESIVE
Per 1000 sq. ft.
Joist Space: 16" o.c.
Bead Dia: 3/8"
Qt. Tubes: 18

Joist Space: 24" o.c.
Bead Dia.: 3/8"
Qt. Tubes: 16

NAILS
Per 1000 sq. ft.
Joist Space: 16" o.c.
Nail: #3190
Amount: 22 lbs.

Joist Space: 24" o.c.
Nail: #3190
Amount: 16 lbs.

NOTE: Homasote Company recommends the application of its decking with the glue-nail system We cannot warrant our product performance if alternate methods are used.

See current Homasote Bulletin FD-8-222-5 for complete installation instructions, including requirements and precautions for noise control and recommendations for application of various floor coverings and finish flooring.

Availability

Homasote building products are available throughout the United States and Canada from local building material dealers. Dealers should have samples and literature describing all Homasote products. If not, write directly to Homasote Company.

INSTALLATION INSTRUCTIONS FOR 4-WAY FLOOR DECK AND STRUCTASOTE®

PRODUCT DESCRIPTION

Homasote 4-Way® Floor Decking is a structural, noise-deadening sub-floor and draft-free resilient underlayment. It consists of multiple plies of Homasote insulating board permanently bonded together to form tough, easy to handle panels. Installed as recommended, Floor Decking adequately supports uniform live loads up to 100 lb./sq. ft. based on a maximum deflection of 1/360 of the span.

SIZES (nominal 2' x 8' or 4' x 8')

4-WAY 1-11/32"
Joist Space: 16" o.c.
Wt. per S.F.: 3.0 lb.
Actual Width: 1'-11-1/8" or 3'-11-1/8"
Actual Length: 7'-11-7/8"

4-WAY 1-3/4"
Joist Space: 24" o.c.
Wt. per S.F.: 4.1 lb.
Actual Width: 1'-11-1/8" or 3'-11-1/8"
Actual Length: 7'-11-7/8"

STRUCTASOTE 1-11/32"
Joist Space: 24" o.c.
Wt. per S.F.: 3.6 lb.
Actual Width: 1'-11-1/8" or 3'-11-1/8"
Actual Length: 7'-11-7/8"

All Homasote 4-Way panels have square-cut ends and T&G on long edges. Estimate 65 panels (2' x 8') or 32 panels (4' x 8') per 1000 sq. ft. of floor.

CODE COMPLIANCES
ICBO Report 1016
FHA Materials Release 1150a
SBCC Report 8653
CMHC Report No. 11924
Flame Spread – Class III (or C)

1. Apply adhesive bead on each joist with double bead wherever panel joints occur. Also apply a bead in the groove of the T&G edge.

2. Place panel with long edge at right angle to joists and with top or bottom in proper position as marked. Stagger joints on alternate joists and allow 1/8 " gap between ends of panels.

3. Support all ends on joists or additional blocking. Support without breaks between framing members and at all points where direction of joists changes.

4. Snug fit tongue-and-grooved sides together. Hammer panel with block or cut off section to avoid damage to tongue.

5. Glue and nail according to diagram pattern and sequence (see other side). Drive nails 1/16" below surface.

Note: Nailing sequence must be maintained and completed before next panel is set in place.

6. For best results, apply glue, position panel and drive nails into center of joist. At panel ends, toe-nail 3/4" from edge into center of joist.

7. Partitions may be installed over floor decking – across floor joists. Nail plates thru decking into joists using 20d nails. For partition parallel to joist, install adequate support framing under plate.

8. Fill cut-out voids with mineral wool. Use metal flange for toilet installation. Cut clearance hole to allow enough material for bolting flange to blocking around soil pipe.

9. Where long runs are involved, allow 1/2" expansion per 50' of length, allow 1/2" expansion at perimeter of abutting walls.

10. Brace joists with diagonal bridging. After all decking is in place securely nail lower ends of bridging to joists.

GENERAL REQUIREMENTS

Like all quality wood products, Homasote 4-Way® Floor Decking will expand and contract with changes in relative humidity. Dimensional changes amount to .25% with variation from 50% to 90% relative humidity.

Construction Site Storage – Protect Floor Decking, as any valuable building product, by storing on a dry platform under shelter. Keep wrapped in weather-capped shipping units until ready for use. If no shelter is available, stack units on skids 8" above grade. Panels must be installed in a dry condition. Every effort should be taken to prevent water ponding on exposed Floor Decking.

Framing – Use cross bridging to secure floor joists. Solid bridging is not recommended. Ends of Floor Decking must bear on solid framing without breaks and at all points where framing changes direction. Wall and partition plates can be applied directly over Floor Decking, across floor joists. If partition parallels floor joists, adequate support framing must be installed under partition plate. For best results (stronger and more squeak-resistant) use nails and adhesive as described in the detailed glue-nail instructions.

INSTALLATION

Homasote 4-Way® Floor Decking must be installed to accommodate expansion and contraction. In large area platforms, provide 1/2" gap for every 50' of length. Trim ends if necessary to assure support. Provide 1/2" gap at all abutting walls. Stagger end joints on alternate joists. Do not butt squared ends tightly, leave 1/8" gap. Snug all T&G edges together tightly.

Complete nailing of the panels within the glue manufacturer’s specified time limit. All nails must be dimpled 1/16" below surface.

Nail each panel completely in accordance with pattern and sequence before placing and proceeding with the next panel.

Glue-nail method – Apply continuous 3/8" beads of APA Approved Decking Adhesive to enough framing for one or two panels at a time. Apply two parallel beads to joists supporting butt joints. Apply a continuous bead into groove of Floor Decking T & G.

Position panel and drive three (for 2' wide panels) or five (for 4' wide panels) Homasote No. 3190 nails (3" long, 9 ga. annular thread with 3/8" head) into centers of each joist, starting at mid-panel and nailing out to ends. Keep nails back 3/4" from ends, toenailing if required.

NOTE: Homasote Co. recommends the application of its decking with the glue-nail system. We cannot warrant our product performance if alternate methods are used.

FLOOR COVERING APPLICATION RECOMMENDATIONS

Where a perfectly smooth, flat sub-floor surface is required, light touch sanding may be necessary because of irregularities in framing members.

In kitchens, bathrooms, laundry rooms, etc., where tile or sheet covering will be applied, Floor Decking must be completely covered with 3/8" thick plywood of suitable underlayment grade before fixtures are mounted.

Resilient Tile – Apply 4' x 4' sheets of 3/8" plywood, as specified by the American Plywood Association, using APA Approved Decking Adhesive as directed. Joints should not coincide with Floor Decking joints. Apply one nail at each corner and center of panels. Tiles or sheet covering can then be installed according to manufacturer’s instructions.

Ceramic Tile and Wood Parquet

Cement: Ceramic tile – apply a layer of 15 lb. felt, expanded wire lath, and cement mortar tile base to Floor Decking – in that order – per manufacturer’s specifications.
Mastic: Prefinished 12" x 12" wood parquet units or 9" x 9" ceramic tile units with a grid or backer material can be installed after applying a layer of 15 lb. felt to Floor Decking, then following the manufacturer’s instructions. For individual wood parquet or ceramic tiles, install sheets of 3/8'' plywood before application.

Carpeting – Apply separate pad and carpet to clean dry Floor Decking with tackless strips according to the carpet manufacturer’s instructions. Additional underlayment is not required. Carpeting made with integral rubber pad backing or other integrated padding material may be applied only if tackless method is used. It should not be glued.

Strips shall be attached to the surface of the Floor Decking in the conventional manner and then additionally nailed, 8" o.c., with 1-3/8'' annular threaded nails.

DECKING ADHESIVE† (per 1000 sq. ft.)
Joist Space: 16" o.c.
Bead Dia.: 3/8"
Qt. Tubes: 18

Joist Space: 24" o.c.
Bead Dia.: 3/8"
Qt. Tubes: 16

NAILS (with Decking Adhesive) (Per 1000 sq. ft.)
Joist Space: 16" o.c.
Homasote Nail No.: 3190 *
With APA Decking Adhesive: – 22 lb.

Joist Space: 24" o.c.
Homasote Nail No.: 3190 *
With APA Decking Adhesive: 16 lb.

(*) No. 3190 Nail: 3", 9 ga., annular thread with 3/8" head.
(†) Meets APA Specifications.

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