Attic roof deck spray foam insulation
I am seeing the foam insulation guys (in Texas and on Youtube) promoting spraying foam on the attic side of the roof decking to create a thermal barrier. This idea intrigues me because all my duct work / air handler is in the attic. I hear this method is expensive. What are your thoughts on this method?
Why not use wet cellulose in the same application? Or cellulose batt if they every make it to the market?
I must be brief. The encapsulated attic is great in theory and would really work well. However, the price tag is usually a deal breaker. It would make a great environment for the ductwork and hvac but you would never see that in energy savings. The key is to use TechShield or Solarboard radiant barrier roof decking, lay the duct work directly on the ceiling joists, and cover with cellulose.
You can’t blow cellulose on that kind of slope very easily. It would have to be netted, blown, packed, blown, packed, etc. Very labor intensive. It can be done but I would not recommend it.
They do have cellulose batts available but costs to cover a full roof deck will be pretty high.
Hope this helps!