Helpful? 0

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 George Levicki
Posted Fri, 08/29/2014 - 11:58
Edited Fri, 08/29/2014 - 12:45

Tags:

1 Answer

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.
Helpful? 0

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 Martin Holladay, GBA Advisor
Posted Fri, 08/29/2014 - 12:43

Other Questions in Energy efficiency and durability

Half insulating stone basement

In Energy efficiency and durability | Asked by Geoffrey Cook | Oct 31, 14

Minimum R-values for exterior foam for 2x6 walls

In Energy efficiency and durability | Asked by Craig Steinman | Oct 30, 14

How to seal 4" EPS foam at slab edge (radon concerns)?

In GBA Pro help | Asked by e c | Oct 29, 14

Pipe leak in basement

In General questions | Asked by Andrew Sirianni | Oct 31, 14

Foam insulation question for 100-year-old brick home

In Green building techniques | Asked by Wes Leland | Oct 30, 14
Register for a free account and join the conversation


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