I had an addition built a few years ago and had the underside of the floor spray foamed. In the winter the floor still get a wee bit cold. After doing a bit of research I realized that the spray foam did not fully cover every surface of the beams. Could the unprotected pieces be the reason for thermal transfer ? I have attached 2 photos .One showing my situation and the other showing how it should be done (I put the dotted line in). Would attaching R10 rigid ,3 sided ,strips help at all ?
What does a wee bit cold mean?
Also what is on the floor above this space?
A floor above an unheated space is always going to be cold in winter depending where you live,
You have an unheated space. Insulation only slows the loss of heat. It doesn't make heat so without heating the floor will be cold. The only way to have a warm floor is to add heat. Only then would I consider additional floor insulation and even then it will have very minimal affect.
Could the unprotected pieces be the reason for thermal transfer ?
But to answer your question, the uninsulated joist has less insulating value than the insulation between them, but the floor is sort of a average of everything..
2xX wood is about R=1.2 per inch, foam is R=6 per inch.
I insulated my attic with R30 batting. (10inches) There are 2 end vents as well as a end to end Peak vent.
Why am I still getting Icicles on the outside?
Should I add more Batting along where the roof meets the wall?Read More
Hello and good day to all.
My house is a two story with a garage, rectangular Georgian style I guess, even though it's in SC. The attic has what I'm going to call gray mineral wool insulation, it comes up to the top of the 2x6 ceiling joists, so it's 5 inches deep in most places. House was built in 1974. There's attic vents on both sides and when I reroofed we put a ridge vent as well. Will I gain anything by laying r-30 unfaced rolls over the existing? I have what I consider high energy bills in both winter and summer, and the house has the original single pane wood windows, which are large, but also real nice and add to my energy use too.
Thanks you for input, I appreciate it!Read More
02-01-22, 05:53 AM
