Professional Portland + Gypsum Underlayments by Northwest Systems

Superior Floor Underlayment Solutions

Northwest Systems is a family-owned, third-generation company with over 40 years of experience in providing high-quality floor underlayment solutions. We specialize in Portland cement-based (PBU) and gypsum underlayments that deliver exceptional performance for commercial, multi-family, residential, institutional, and light industrial projects.

About PBU Portland Cement Underlayment

PBU — a Portland cement-based, non-structural floor underlayment — is mixed on site using PBU, Portland cement, sand, and water. Pumped into place, it forms a high strength yet lightweight cement topping, perfect for use across various project types. PBU combines the excellent durability of concrete with lightweight, crack-resistant, sound-insulating, and fire-resistant qualities.

Cost-effectiveness, proven performance, toughness, and speed of installation make PBU ideal over cast-in-place concrete, pre-cast concrete, and plywood sub-floors. In fact, up to 25,000 sq. ft. can be installed in one day!

Why Choose Our Underlayment Services?

• Experience and Expertise: With over 40 years of experience as a third-generation company, we have a level of knowledge and skill that is hard to match.
• Efficiency and Cost-Effectiveness: Our superior products are installed in a single, simple process, which saves our clients time and money compared to our competitors.
• Customer-Centric Approach: As a small, hands-on company, we prioritize attentive customer service and superior craftsmanship, ensuring a positive experience and a high-quality result for every project.

Technical Specifications

ASTM C 109 Modified

• Compressive Strength: 3,500 psi to 6,500 psi
• Dry Density: 105 lb/ft³, 1.7 g/cm³
• Weight: 4.0 lb/ft² @ ½", 18.5 kg/m² @ 12mm
• Flame Spread: 0
• Fuel Contributed: 0
• Smoke Developed: 0

Installation Limitations

Do not apply PBU when the temperature is below 40° Fahrenheit (or 4° Celsius). The structural floor must support design loads with maximum L/360 deflection. If application thickness exceeds 4" over wood, consult Northwest Systems for technical advice.

Contact us at (905) 833-0622 or Daniel@northwestsystems.com for consultations and free estimates for all our underlayment work.