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Durable Portland Underlayments and Thermal Mass Solutions
At Northwest Systems, we take pride in being a third-generation, hands-on company dedicated to delivering exceptional service and craftsmanship. With over four decades of experience, our expertise lies in thermal mass solutions and durable floor underlayments for residential and commercial projects. Our innovative systems enhance radiant flooring efficiency while providing structural benefits like sound insulation and fire resistance. We serve clients across the Canadian and U.S.

Eastern seaboard, combining proven methods with cutting-edge materials to ensure lasting results. Our commitment to quality is reflected in our ULC-listed products, one-step installation process, and a reputation built on countless satisfied customers. We prioritize transparency, offering free estimates and consultations to ensure clarity and trust in every project.
Services
Thermal Mass Over-Pour Portland Underlayments Floor Leveling Sound Insulation Fire-Resistant Flooring Crack-Resistant Underlayments Lightweight Cement Toppings Commercial Floor Solutions Residential Floor Solutions
Highlights and features
  • We offer 40+ years of experience in thermal mass solutions.
  • Our team understands the unique needs of Canadian and U.S. markets.
  • Our one-step installation process saves time and reduces costs.
  • We are fully insured for your protection.
  • Our ULC-listed fire-resistant thermal mass enhances home safety.
Associations and certifications
  • ULC
Services
Thermal Mass Over-Pour
Our thermal mass over-pour enhances underfloor heating efficiency by encasing tubing in crack-resistant material. It provides faster heat response, structural reinforcement, and fire resistance. Ideal for residential and commercial projects requiring durable, energy-efficient radiant heating systems.
Portland Underlayments
Portland cement-based underlayments offer lightweight durability for commercial and residential floors. They provide sound insulation, fire resistance, and rapid installation. Suitable for concrete, plywood, and pre-cast subfloors with compressive strengths of 3,5006,500 psi.
Sound Insulation
Our thermal mass and underlayments reduce noise transmission between floors. The dense material dampens sound while maintaining structural integrity. Perfect for multi-family housing and commercial spaces requiring quiet environments.
Fire-Resistant Flooring
ULC-listed fire-resistant systems stiffen floor structures and prevent flame spread. With zero fuel contribution and smoke development, they meet strict safety standards for residential and commercial buildings.
Crack-Resistant Underlayments
Non-shrinking, crack-resistant materials ensure long-lasting floors. The underlayments bond to substrates, eliminating squeaks and nail pops. Ideal for radiant heating systems requiring maintenance-free performance.
Questions
What areas do you serve?
We operate across Ontario, Canada, and the U.S. Eastern seaboard, including Michigan, Ohio, Pennsylvania, Connecticut, and Florida.
How does thermal mass improve radiant heating?
Thermal mass encases heating tubing in noncombustible material, enhancing heat transfer efficiency and response time while providing structural benefits.
What makes your underlayments durable?
Our Portland-based underlayments offer compressive strengths of 3,500–6,500 psi and resist cracking, sound transmission, and fire damage.
Do you offer free consultations?
Yes, we provide free estimates and technical consultations to ensure your project meets performance and budget requirements.
Are your products code-compliant?
Yes, our systems are ULC-listed for fire resistance and meet ASTM C109 standards for compressive strength.