Canadian Owned & Operated Since 1964
Standard Fir Plywood 4-ft x 9-ft
*Online Pricing Only
Standard Fir Plywood 4-ft x 9-ft
Standard fir plywood is a cross-laminated structural panel made from thin softwood veneers bonded with a waterproof exterior-type adhesive. It is the everyday panel for roof, wall and floor sheathing, subfloors and general construction work.
These are full 4 ft x 9 ft sheets, one sheet taller than a standard 4 x 8 panel. A 9 ft sheet can cover a 9 ft wall height in a single piece, which cuts horizontal seams and saves cutting and fastening time. Choose 1/2 in. for wall and roof sheathing or 3/4 in. for subfloors and heavier-duty applications.
Need a different size or thickness? We also carry standard fir plywood in 4 ft x 8 ft sheets. Contact us for other sizes or special orders.
Features and Common Uses
- Full 4 ft x 9 ft sheet, 36 sq. ft. of coverage per panel
- Cross-laminated veneer layers give strength and dimensional stability in both directions
- Waterproof exterior-type glue bond suits construction exposure during building
- Made from Douglas fir and Canadian softwood species, the standard structural plywood in Canadian construction
- Available in 1/2 in. (12.5 mm) and 3/4 in. (18.5 mm) thickness
Commonly used for:
- Wall sheathing, including tall walls framed for 9 ft ceilings
- Roof sheathing
- Subfloors and floor sheathing (3/4 in.)
- General construction, temporary enclosures, hoarding and shop projects
Specifications
| Product | Standard Fir Plywood |
|---|---|
| Panel size | 4 ft x 9 ft (1220 mm x 2745 mm) |
| Thicknesses | 1/2 in. (12.5 mm) and 3/4 in. (18.5 mm) |
| Material | Douglas fir and Canadian softwood veneer |
| Glue bond | Waterproof, exterior type |
| Item numbers | PF1249S (1/2 in.), PF3449S (3/4 in.) |
| Sold as | Per sheet |
Panel grade, span rating and fastening depend on the grade stamp on the sheet and on your framing. Douglas fir plywood is made to CSA O121 and Canadian softwood plywood to CSA O151. Check the stamp and your local building code before you install. Source: Plywood Design Fundamentals, Canadian Plywood Association (PDF).
How to Install
- Confirm the grade stamp and thickness suit the span and the application, and that the framing is dry, straight and at the right spacing.
- For roofs and floors, run the face grain across the framing members and stagger the end joints from row to row.
- Leave a small gap, about 2 mm (1/8 in.), between panel edges and ends to allow for moisture movement.
- Nail or screw into every framing member. Space fasteners more closely at panel edges than in the field, as your building code or the span table requires.
- Cut with a circular saw with the good face down for a cleaner edge, and support the panel on both sides of the cut.
Grade stamps, thickness and span tables. Source: Plywood Design Fundamentals, Canadian Plywood Association (PDF).
Frequently Asked Questions
What is the difference between 1/2 in. and 3/4 in. plywood?
Thickness and stiffness. 1/2 in. (12.5 mm) is the usual choice for wall and roof sheathing. 3/4 in. (18.5 mm) is stiffer and is used for subfloors and heavier-duty applications.
Why choose a 4 x 9 sheet over 4 x 8?
A 9 ft sheet covers a 9 ft wall in one piece, so there is no horizontal seam to block and fewer cuts to make.
Is this plywood suitable for outdoor use?
It is made with a waterproof exterior-type glue bond and is built for construction exposure while a building is going up. It is not pressure treated, so keep it covered with siding, roofing or paint and out of long-term ground contact.
Do you have it in stock?
We keep both thicknesses in stock at our New Westminster, BC location. Call or message us before a large order so we can confirm quantity.