Black Underlayment Paper - 432 sq.ft per Roll

HWD-15 15-lb Black Paper / Asphalt-Saturated Underlayment

HWD-15 is a premium underlayment paper designed specifically for hardwood floor installations. It’s a single ply of kraft paper deeply saturated with asphalt, providing a permeable moisture vapor retarder that helps protect your wood floors from moisture issues without trapping dampness. 

Key Features & Benefits:

• Moisture Vapor Control — Reduces upward moisture from the subfloor, helping limit risks like cupping, warping, or mold. 

• Perm Selectivity — It’s permeable, so it lets residual moisture escape downward rather than becoming trapped. 

• Compatibility with Wood Flooring — Designed to work optimally under hardwood flooring systems, contributing to longevity and performance. 

• Indoor Air Quality Certified — Meets CA-01350 standard, making it safer for indoor environments. 

• Physical Properties — Typical rolls cover around 432 sq ft. 

• Appearance & Handling — It appears as a dark, asphalt-saturated paper. Because of its asphalt content, it gives off a slight bitumen odor initially. 

Usage & Installation Notes:

1. Roll Out on the Subfloor — Lay the paper directly over the clean, flat subfloor to act as the vapor retarder layer.

2. Overlap Seams — Typically seams are overlapped or taped according to manufacturer guidelines to ensure continuous protection.

3. Don’t Trap Moisture — Because it allows some permeability, it helps maintain moisture balance if installed correctly.

4. Use in Conjunction with Other Systems — It is often part of a flooring system that includes proper acclimation, adhesives, and finish.