1/4"x4'x8' Ultraplyxl Premium Plywood Underlayment

UltraplyXL Premium Plywood Underlayment is a 1/4" x 4' x 8' plywood underlayment panel designed to provide a smooth, consistent surface beneath finished flooring. Its calibrated thickness and no-core-void construction help provide a uniform panel surface for flooring installations.

UltraplyXL is designed for use beneath a variety of finished floor coverings and is backed by a transferable lifetime warranty when installed according to the manufacturer's requirements.

Features & Benefits

• 1/4" x 4' x 8' panel: Provides 32 square feet of coverage per sheet.
• Premium plywood underlayment: Designed specifically for use beneath finished flooring.
• Smooth surface: Provides a consistent surface for flooring installation.
• Calibrated thickness: Manufactured for consistent panel thickness. 
• No-core-void construction: Helps provide a uniform panel without voids in the core. 
• Score-and-snap installation: Manufacturer information indicates the panels can be scored and snapped with a knife for easier installation. 
• Transferable lifetime warranty: Manufacturer warranty applies when the product is handled and installed according to the specified installation requirements. 

Product Specifications

Frequently Asked Questions

What size is UltraplyXL Premium Underlayment?
This panel is 1/4" x 4' x 8' and provides 32 square feet of coverage before accounting for cuts and waste.

What is UltraplyXL underlayment used for?
UltraplyXL is designed for use as plywood underlayment beneath finished flooring. Manufacturer materials identify applications beneath vinyl, carpet, wood, tile, and other floor covering products.

Is UltraplyXL structural plywood?
No. It is designed as a flooring underlayment rather than as structural sheathing or subflooring.

Does UltraplyXL have a smooth surface?
Yes. The manufacturer describes UltraplyXL as having an ultra-smooth surface with calibrated thickness and no core voids.

Can UltraplyXL be scored and snapped?
Yes. Manufacturer information states that the panels can be scored and snapped with a knife for easier installation.

Does UltraplyXL have a warranty?
UltraplyXL is backed by a transferable lifetime warranty when used and installed according to the manufacturer's requirements. The warranty addresses issues including delamination and wood-color transfer to the finished floor covering.

Can UltraplyXL be used under any flooring?
Manufacturer materials identify the product for use under a variety of floor coverings. Always confirm underlayment requirements with the finished flooring and adhesive manufacturers before installation.

Installation Notes

Acclimate the panels for 18 to 48 hours in the room where they will be installed. The manufacturer's installation instructions call for installation over a structurally sound, smooth, clean, and dry wood subfloor.

Install the long dimension of the panel perpendicular to the floor joists for maximum rigidity. Offset underlayment seams from subfloor seams and stagger panel joints according to the manufacturer's installation instructions.

Follow the manufacturer's specified fastening pattern, panel spacing, and finished-floor installation requirements. Do not install defective or damaged panels.