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Faunsdale, AL | The low clearance areas are where the blown in stuff is easier and faster. Plus it covers the joists but I’m guessing you can come back with a second layer running across them if you want to.
I missed spray foam my roof by just a couple years. Had heard of it, even seen it on TV but didn’t know anyone that would do it when we were finishing the upstairs of our 1-1/2 storey 1830’s house. Rafters are about 3” deep and adding much thickness on the bottoms would have really messed with hanging and finishing the drywall, so I cut 3” polyisocyanurate foam and fitted it in the rafter bays. Same for adding anything on top of the decking. Would really have made trimming out the dormers a challenge and the new roof was already on. Spray foam would have been faster and sealed better! Fast forward a few years and one of my cousins’ husband went in business spraying insulation.
I think polyisocyanurate was the highest R per inch at the time and it did cut neatly compared to styrofoam.
Edited by ccjersey 11/6/2025 18:34
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