Using vegetable oil coated plywood as roof sheathing ?
sam_fujiyama
| Posted in General Questions on
My concrete contractor is using vegetable oil cut with mineral spirits as a release agent for his forms. I’m going to be left with quite a few sheets of 5/8″ plywood after we to strip them (extras which i have purchased).
I was considering reusing them for my roof sheathing (oiled side down), but a bit worried about bacterial growth when the oil goes rancid.
Thoughts ?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
Replies
Going rancid just means that the oil has oxidized. It might be somewhat more attractive to mold than plain plywood but I doubt it would make a huge difference. You could flood the sheet with mineral spirits to dissolve it, or hit it with a blowtorch to burn off the oil.
Thanks Michael, i was considering something similar as well. Thank you !
This used to be customary. Except it was used motor oil, not vegetable oil.