What can I use as an air barrier under an old wood floor with no sub floor?
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What can I use as an air barrier under an old wood floor with no sub floor?
Mimi Costley
Nov. 6, 2021Last updated: Nov. 6, 2021
This is an old house 1860 with 1910 addition. The old wood floors have no subfloor and on first floor, that is above a dirt floor basement. Since we have access to the floor from the basement I want to put up something that will block airflow through the floor. A bit of insulation would be a plus. I think it should also allow moisture to pass through. I would rather put it between the floor joists (> 2" x 10", 2' on center, oak hard as rock) and not cover them up. I have considered homosote. Any suggestions?
Thanks, Mimi
让老房子的地板不透气对舒适度和效率都很重要,但在这一点上我更担心的是泥土地板。你所有的问题都是可以解决的,所以不要担心,但让我们从最基层开始。如果你有一个不隔热的泥土地板爬行空间,那么你就有一个源源不断的湿气来源,这些湿气会不断地从地面蒸发,并在你的家里留下湿气。这在舒适度、能源效率和空气质量方面有很多负面影响。See this page first as it will probably answer all your questions –
Crawl Space Insulation Tips for Insulating Crawlspaces Properly
I think your first step is to cover the dirt with a poly membrane, and either lay insulation right on the dirt and keep that lower space warm, or insulate between the joists as you mentioned and keep it cooler. As for simply stopping air leakage through the floor there are a few options, but see if those pages present a solution first and get back to us. Also please let us know what building climate zone you are in so we know what kind of temperatures you are up against in winter.