Hot air doesn t get formed.
Prepping soffits for spray foam in attic.
Here in the southeastern us open cell is most often the spray foam of choice.
Well as any good building scientist will tell you that depends.
In a proper spray foam job a contractor doesn t just spray foam all over the top of your attic and go home.
Remove any existing insulation debris and dust and prepare the attic floor for spray foam insulation.
So are other gaps and cracks that let in outdoor air.
The eaves don t get blocked.
When you contract with kc spray foam for your spray on insulation needs this step is included in our price quote.
This is most often done with spray polyurethane foam spf insulation either open cell or closed cell.
Otherwise humidity will quickly creep into your attic.
It s how we protect the job site from overspray.
Closed cell spray foam has a perm rating of approximately 1 5 to 3 0 per 25 mm 1 in and an r value of approximately 1 05 per 25 mm 6 0 per 1 in.
It s also how we ensure we leave the site better than when we started a job.
The photo above shows the scar from a power attic ventilator installed in a spray foam attic but i ve heard of several cases where roofers installed or tried to ridge vents.
Normally in occupied areas all spray foam must be covered by a 15 minute thermal barrier such as thick drywall per code requirements in irc section 316 4 and ibc section 2603 4.
They also need to seal off areas of air leakage to the outdoors.
Install ventilation baffles essentially plastic or foam vents into the eaves by pulling the existing insulation away from the roof positioning the new vent chute so the bottom extends six inches into the overhang and stapling it into place.
An attic that s brought inside the building enclosure is a beautiful thing.
We come in and cover all windows doors.
The prep work ahead of a sprayed insulation job is an important step.
Don t let your attic suck power attic ventilators are a.
Verify that all attic floor penetrations can be adequately sealed with spray foam insulation.
Provide additional air sealing measures such as sealants or rigid foam blocking of large holes as needed.
Intumescent coatings are not always needed to coat spray foam in the attic in order to meet code thermal barrier requirements.
And you avoid wood rot and mold.
Gable vents and soffits are the big culprits here.
