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Old 03-05-2017, 01:22 AM   #1
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Location: Powell River, British Columbia Canada
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Default Cleaning mildew on canvas

We have a very new yurt and already we have a mildew problem. We're addressing the humidity issue (we live in the Pacific NW so it's a major concern), but once that's done I need to clean the mildew that has grown in the folds of the fabric where the rafters meet the fabric wall. We have 100% cotton canvas walls (Sunforger Marine Boat Shrunk) and they say to wash with soap and warm water but I really don't want this problem to get out of hand. We live in a rain forest where mold and fungus flourish!

Any advice on how to approach the cleanup is most most welcome!

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Old 03-07-2017, 06:34 PM   #2
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Default Re: Cleaning mildew on canvas

A dilute solution of bleach and water will kill the mold. Too strong and it will eat the canvas as well. What the percentage is I don't know, but I'll bet you could find out online. Try calling Davis tent in Denver Colorado and ask them. Or alternately Montana tent Co. I don't even know if the big dogs that sponsor this site offer a 100% canvas cover, because they degrade so quickly in wet environments.

My cover is 100% cotton canvas, and was treated with water repellent equivalent to Sunforger. My canvas cover is nearly four years old, and it is in need of either replacement, or being painted. I wouldn't bleach it. My yurt is in CO, a semi arid country. I hate to say it but canvas is a poor cover in a wet humid environment. Good luck.
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Old 03-11-2017, 04:30 PM   #3
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Default Re: Cleaning mildew on canvas

Vinegar is superior to bleach for actually killing mold. Bleach is better for taking out stains, but it doesn't kill a lot of molds. Are you having this issue on the interior or the exterior? If interior, did you get an insulation kit and have you properly ventilated (opening dome, plenty of windows, 2 doors that can open)?
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Old 03-11-2017, 11:14 PM   #4
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Default Re: Cleaning mildew on canvas

We recommend a cleaner by iosso. You can buy it as a concentrate to mix with water. They also sell a proofing chemical too.
I have not used it personally, but several of our customers who had our yurts set up for long periods in really damp climates have used it to great success.
I had an outdoor school who were about to buy new covers for several yurts because they packed them away damp and when they took them out in the spring, they were covered in mold. After using the mold remover, they didn't have the buy new.
Check them out. www.iosso.com
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Old 03-12-2017, 07:46 AM   #5
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Default Re: Cleaning mildew on canvas

Great tip! Thanks! Personally I've been lucky, but mold is such a huge issue for some. Nice to hear something positive.
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Old 03-12-2017, 11:43 PM   #6
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Default Re: Cleaning mildew on canvas

Thanks for the info folks.
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Old 03-13-2017, 01:16 AM   #7
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Default Re: Cleaning mildew on canvas

Hi! Thanks for the advice. It's a brand new yurt, just five months old and yes we have the dome cracked every day and lots of windows and doors, I air it out at least once/day with all the doors and windows open (even in the freezing cold), but still, we live in it full time and are bathing/cooking/living with a family of four and we create a lot of moisture I guess. Our humidity level seems to be at 50 all the time...normal for the Pacific Northwest I think. I can see actually condensation in the corners sometimes, so that's a lot of water!
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