Polyurethane insulation

• keeps building cool. insulating the roof will make building interiors cooler and therefore more comfortable.
• this will lessen the need for cooling and lower energy used for air-conditioning. This will help reduce climate change in the long run.

Polyurethane vs other insulation (R value per inch) 

• Polyethylene foam                        3
• Rock wool roll                                3 - 3.85
• Polyurethane foam (sprayed)     5.5 - 6.5

Advantages of using PU

• 1 inch of PU = 2 inches of other materials. Insulation will be thinner and therefore lightweight. This means that for roof applications, structural load will be less.
• There are different applications like spray (on top of roof ), boards, or sandwich panels.
• Rigid, closed cell PU is not affected by water vapor, and it maintains its form.

Disadvantages of using PU

• PU foam is combustible but contains fire retardant and fire rated B2, which means it will self extinguish.