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 - 10:58
Edited Fri, 08/29/2014 - 11:45

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 - 11:43

Other Questions in Energy efficiency and durability

Quarter Round on Rammed Earth

In Green building techniques | Asked by Terry Lee | Dec 18, 14

Rigid insulation

In General questions | Asked by Shawn Ward | Dec 16, 14

Solar thermal systems for heating water

In Mechanicals | Asked by aj builder, Upstate NY Zone 6a | Dec 15, 14

What is the best way to insulate our new home?

In Energy efficiency and durability | Asked by richard fasching | Dec 17, 14
Register for a free account and join the conversation


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