Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Roofing material?Amanda Peck ap615 at hotmail.com
Thu Jan 5 17:43:06 PST 2006
I had thought that Ondura would not be good. I still think I wouldn't use it, but I did notice that one of the links mentioned earlier had this list--is Ondura a bitumen based product??: from http://www.rainharvesting.com.au/roof_surface.asp The most suitable roofing materials for collecting potable water* are: 1. Colorbond® steel sheets or tiles 2. Zincalume® steel sheets or tiles 3. Glazed tiles well fired 4. Concrete/cement tiles 5. Clay tiles 6. ** Fibro - new type only 7. Composite tiles - bitumen based That list does not include any brush-on or membrane products. I've looked at this before, and there are some people who advertise in Fine Homebuilding who do mention potable water and roofs in the same sentence.... EPDM either the sheet or the brush-on can be potable water certified, although these guys only mention fish-safe. http://www.epdmcoatings.com/ On the other hand, these guys do (although one part of this one is an "isocyanate prepolymer" and they mention quite a few precautions during application--I think I may be sensitive to '"isocyanates" not sure if they're loose here): http://www.gaco.com/01prd_02uc_lm60.html and I think these as well. http://users.rcn.com/sealproinc/protective_coatings.htm All high tech and maybe not what we want for our cob--or low-"chemical" house. The types of metal roofing might be a better bet for us. ............................... Thad replied to me: Just have to ask. What roofing material would be available to use as rainwater collection that would be safe to use for potable water? Considering the abuse roofing material takes from the elements. I would think that most any asphalt material would leech into the water. Galvanized metal would certainly leech into the water. Fiberglass would not last and would eventually degrade and leech into the water. Plastic jugs or buckets cut to use for shingles are not UV stable and quickly become brittle and fail. Other than stainless steel or copper which are obviously too expensive or glass; which would be fine in a greenhouse application, what would work?
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