Q&A Forums
roof vs wall foam Post New Topic | Post Reply
| Author | Comments |
|---|---|
|
elliot weaver
Posted: Oct 28, 2008 07:08 AM
|
roof vs wall foam
Is it okay to use a closed cell wall foam on a roof?
|
|
richard sucher II
Posted: Oct 28, 2008 01:24 PM
|
NO - wrong physical properties for roof application. Needs to be nominal three pound foam for roof. |
|
mason
Posted: Nov 01, 2008 10:29 AM
|
Most closed cell wall foam weighs between 1.5 to 20 lbs per cubic foot. Its compressive and tensile strength ranges between 15 to 25 psi. This foam does not have the dimensional stability, strength or water absorption resistance to qualify as a roofing foam. Roofing foams weigh average around 2.7 to 3.2 lbs to cubic foot and have a minimum compressive and tensile strength of 40 psi. This gives the foam sufficient strength to resist normal foot traffic and provide a foam that will not blister or absorb water. In addition the roofing foam must be protected with an elastomeric coating specifically designed for use with SPF or an aggregate covering. For more information refer to SPFA's technical guidlelines on SPF roofing applications, AY 102, (Coatings) AY 104, (Guidelines for SPF roofing) AY 110 (Guidelines for aggregate covered SPF roofing) AY 122 (Recoating guideline) AY 127 (Maintenance Manual for SPF roofing) |
