0 Helpful?

Flash foam and Roxul?

I understand from prior posts there are concerns with the flash foam and fiberglass insulation in terms of moisture vapor.

Would the use of proper barriers and Roxul instead of fiberglass help to abate that concern?

Asked by geol2
Posted Aug 29, 2014 10:58 AM ET
Edited Aug 29, 2014 11:45 AM ET

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.

George,
Your question is unclear. The "flash and batt" or "flash and fill" technique works, as long as (a) you use closed-cell spray foam rather than open-cell spray foam, and (b) the foam layer is thick enough to keep the interior side of the cured foam above the dew point in January.

There is no technical reason why you can't use Roxul mineral wool insulation for a flash-and-batt job, but I don't think it would be particularly cost-effective. Other insulating approaches make more sense.

Answered by user-756436
Posted Aug 29, 2014 11:43 AM ET

Other Questions in Energy efficiency and durability

Sub slab drainage details

In Green building techniques | Asked by William Costello | Feb 22, 17

Min. continuous insulation thickness vs fastening requirements

In General questions | Asked by Inger Peters | Feb 22, 17

Pink Sill Foam vs Green Treated Lumber

In Building Code Questions | Asked by Peter L | Feb 22, 17

Roof insulation for a West Baltimore row house

In Energy efficiency and durability | Asked by Timothy Werner | Feb 20, 17
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!