Spray Foam Attic Ductwork

The spray foam contractor installs louvered grilles between your attic and your living space.

Spray foam attic ductwork. Each dealer installer we talked to talked up their product and diss the competitor s. These cost about 400 for 200 board feet. Spray foaming the roof deck is definitely the way to go over foaming the attic floor. In my opinion the presentation at the doe link you posted seems to have lost sight of the rationale for using closed cell foam on attic ducts.

Note that this isn t a good idea if you have a very airtight high performance home or if your home simply isn t large enough to provide the air needed for combustion. The doe and building america specifically did a lot of research on what s required to bury ducts in ceiling insulation. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. The question is which type brand to use.

We mean that literally by the way. We just finished installing an a c air handler with rigid round metal ducts in our attic. The ah furnace cabinet will be inside conditioned space as will the duct work. As a result you can reduce the temperature in your attic by a lot anywhere from 120 degrees to around 95 during peak summer.

A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. Nothing unusual about that. We are located in southern ontario canada. The installation was done by a hvac pro.

You have to bring in fresh air in a tight home like this so i hope you are putting the v back in hac. Attics with spray foam insulation are so cool. Where allowed foam it green can be sprayed onto duct work to maintain temperature eliminate condensation and reduce vibration. The unconditioned space also houses his hvac system.

Please note that only the supply duct work should be sealed. In a vented attic all of that expensive airflow is lost to the environment. Some inspectors may require the use of the dc315 thermal barrier coating. This is a job that you can probably do yourself with a portable spray foam kit.

One huge benefit of the spray foam insulated attic is that conditioned air leakage from the ac furnace duct system is contained and used to condition the attic. Closed cell foam is very expensive especially the first lift 1 5 in this case. Our plan is to insulate the ducts with spray foam. Case of the missing spray foam ted has more than a few cobwebs in his attic.

These allow the furnace to use air from your home for the combustion process. The attic will stay within a few degrees of the living space. When we seal the attic with spray foam it s as tight as a butter tub.