06-23-2021, 11:59 AM
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#6
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Yurt Forum Addict
Join Date: Nov 2013
Posts: 1,882
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Re: Waterproofing Canvas
My sunforger factory treated 17 ounce cotton canvas was grade A at water repellency the first year. B the second. C to D the third, F the fourth, and a total fail after that. That's year around, no cleaning, no reapplication of any waterproofer. I call that VERY good service for a natural material left outside in the elements year around, that does not off gas a strong smell.
Beats me about roof pitch and longevity. My guess is Sunforger and equivalent treatments in canvas are gonna absorb water regardless of pitch, as the repellent wears out in a couple three years.
As an aside here, I would not get canvas that is treated with a heavy opaque wax and dye. My son bought me a roll of 'olive green military' canvas. There's a much heavier dye and wax in that stuff relative to Sunforger. Water sheets off it like it does off a plastic tarp. My guess is it probably would keep the water out for a couple years longer than Sunforger. But by God it is absolutely awful stuff.
I made a small tarp out of it last summer and had it erected continuously for a few months while building my shed. Water poured off it immediately in a rain but it till stunk to high hell even after a few months of intense sun. 'No chance' I would live in a tent made with that stuff.
Good luck.
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