3/4" Tongue And Groove ULC Fir Plywood 4' X 8'
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Product Overview
Crafted from high-quality Douglas Fir, this plywood is designed to bridge the gap between your structural subfloor and your finished flooring. The Tongue and Groove edges ensure a tight, interlocking fit that eliminates "floor squeak" and prevents vertical displacement between panels.
Key Features
Precision T&G Edges: Features a factory-milled tongue and groove system for easy installation and a flat, level surface across the entire room.
Superior Stability: The natural density of Douglas Fir provides exceptional nail-holding power and resistance to warping or delamination.
Sanded Face: Each sheet is touch-sanded to a smooth finish, making it ideal for thin-set applications, luxury vinyl plank (LVP), hardwood, or carpet.
Moisture Resistance: Bonded with exterior-grade atmospheric glue, it handles job site moisture and humidity better than standard interior panels.
Technical Specifications
| Feature | Specification |
|---|---|
| Wood Species | Douglas Fir / Western Softwood |
| Edge Profile | Tongue and Groove (Long Sides) |
| Face Grade | Underlayment Grade (Plugged & Sanded) |
| Common Thicknesses | 19/32", 23/32", 1-1/8" |
| Panel Size | 4' x 8' |
| Certification | APA Rated (Engineered Wood Association) |
Why Choose Fir Underlayment?
Unlike generic construction-grade plywood, our Fir Underlayment is void-filled. This means there are no hidden gaps in the inner plies that could lead to soft spots or punctures under heavy furniture. It provides a stiff, uniform deck that extends the life of your tile, laminate, or hardwood floors.
Pro Tip: Always allow your underlayment to acclimate to the room's humidity for 48–72 hours before installation to ensure the tightest possible joints.