Crawl Space Insulation - which material is better, blown in cellulose, or AirKrete

I would like to help you I’m a insulator you can call me at 6313366609 rich

energyaideofny

in Insulation 12 years and 2 months ago

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Bar | 12 years and 5 months ago

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Has anyone done research about which type of insulation is best for the crawl space between the top floor apt. and the roof?  What would you recommend and why?

BobMarvin | 12 years and 5 months ago

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It’s called the cockloft; the crawl space is UNDER a house that lacks a cellar. I think the important factor is the total R value of whatever insullation you use. I had cellulose blown in about 35 years ago and it’s been quite effective. Perhaps there’s a better material now, but you must evaluate the amount of space ypou have and the R value that can be achieved.

wiley | 12 years and 5 months ago

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My sense is that in new construction a foam like air krete is preferred in that it creates an seal and typically does not require a moisture barrier. The issue with your cockloft is that it’s unlikely that there is enough room to properly spray the material for the intended result. This would not be an isue with celluslose or fibergolass. Cellulose is great however if you have a flat roof at some point it is going to leak and as the cellulose absorbs water it may take some time to discover that leak. Fiberglass is less prone to moisture issues. In my experience the key issues to consider are total r factor, proper ventilation (difficult in a flat roof) and use of a moisture barrier. There is much debate about the use of a moisture barrier for these applications.