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Quite simply, it is “insulation plus sealant”. As a rigid cellular plastic with over 95% closed cell content, Spray Polyurethane Foam Insulation acts as insulation, an air barrier and, in some cases, also a vapour barrier. Spray Polyurethane Foam Insulation will cut energy costs and improve comfort levels in any building.

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Where in the envelope is Spray Polyurethane Foam used?

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  • Foundations
  • Crawl spaces
  • Walls
  • Header spaces
  • Roofs
  • Ceilings
  • Interior walls
  • Can be used as the primary air barrier material
  • Can be used to connect other building materials together

The technical requirements for medium density spray polyurethane foam is outlined in the CAN/ULC S705.1 Material Standard. The physical properties are:

Table 1 – Requirements for Physical Properties
PropertyUnitRequirementsTest Method
  Min.Max. 
Air Permeance (Mandatory material only testing)l/s @ 75Pa.02Clause 5.5.1
Air Permeance (Optional system testing)l/s @ 75Pa.05Clause 5.5.1
Apparent Core Densitykg/m³28Clause 5.5.2
Compressive StrengthKPa170Clause 5.5.3
Dimensional Stability
Volume Change at:    
-20°C%– 1Clause 5.5.4
100°C%+10 
70°C, 97 ± 3% RH%+ 14 
Surface Burning Characteristics
Flame Spread500Clause 5.5.5
Initial Thermal Resistance – 50mm sample after a minimum of 2 d and a maximum of 14 d at 23 ±2°Cm² · °C/W2.5 Clause 5.5.7
Long Term Thermal Resistance for a 50 mm thick specimenm² · °C/W2.0 Clause 5.5.8
Tensile ModuluskPa200Clause 5.5.9
Volatile Organic EmissionsPassClause 5.5.10
Water Absorption by Volume%4Clause 5.5.11
Water Vapour Permeance for a 50 mm thick specimenng/Pa · s · m²60Clause 5.5.12

Note 1:The test methods used to determine the material properties provide a means of comparing different cellular plastic thermal insulations. They are intended for use in specifications, product evaluations and quality control. They are not intended to predict end-use product performance.

  • It acts as a seamless insulation making it more efficient than any other material used in the industry
  • SPF is airtight which eliminates all air infiltration or exfiltration
  • It is durable and odourless
  • It will not settle or shrink, making it stable
  • Because SPF is light and versatile and has strong adhesive properties, it easily fills difficult to reach places and adheres to most clean surfaces
  • It is quick and easy to install, making SPF an inexpensive alternative to other types of insulation.

All manufactured materials will off-gas to some extent. Some building products will off-gas in large qualities

Medium density spray polyurethane foam meeting the CAN/ULC S705.1 Material Standard is the only building product that is tested for occupant conditions. The industry has then taken an unprecedented stance and required that all manufacturers meet a maximum limit of 1/100 of the government allowable limit. Manufacturers have met this requirement in less than 24 hours.

Spray polyurethane foam is an organic material and all organic materials burn. Medium density spray polyurethane foam contains a fire retardant so that the flame spread is less than 500 when tested in accordance with CAN/ULC S102 and specimens prepared in accordance with the requirements of the National Building Code.

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