Q: Insulating Rafter Ceilings w/ Ridgid Foam

[DirtyLittleSecret]

Finally getting back to the project and have a hopefully simple question:

When insulating rafter ceilings with ridgid foam (& ridge vent/vent spacers) how much space should there be at the bottom and top of the ridgid foam panels (nearest the vents)?

Hope I made this clear enough...

[MikeT]

You want there to be enough space so that air can be drawn in the vents and to cool the roof, so 1" perhaps, not more.  That is, if I am following what you are asking.....

[MountainDon]

I believe 1" is quoted as sufficient in a few things I've read.

[DirtyLittleSecret]

Thanks.  I was guessing 2-3", but since it would be the entire length of the bottom (24" o/c) even 1" is a bit!  Goin' nuts this weekend with foam...and the trackhoe.