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sWe's Tiling Tips - How to Tile
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[QUOTE="Ajax123, post: 226656, member: 12267"] The Epoxy Primers will not trap moisture but what they will do is act as an effective barrier to sulphates which is what causes the ettrignite reaction as they migrate to the surface as the residual moisture moves around in the system. If you could get it truly dry the reaction would not occur because it need water to progress. Of course getting it truly dry is impossible because it will, as with all screeds, equillibrate with atmosphere. I am surprised you don't see more of it in Sweden because I was under the impression that a lot of gypsum products e.g. wall board, wall blocks etc were used over there. Maybe not though. If you were to use an Epoxy DPM this is a different thing to a primer and it would indeed supress the moisture. The idea is that it controls the rate of moisture escaping in order that it can escape through the flooring at a rate at which it can cope. Some anhydrite Manufacturers now have completed tests which allow DPMs to be used in certain curcumstances. Heated screeds are still a touchy subject but this will no doubt come as well in time. Hydration, hydrolysis - what's an "olysis" between freinds. I knew what you meant. As for it staining Trav. Not certain but will find out. Don't beleive it would be a problem because it is white. The moisture level will be very low compared to the amount of gypsum present so the massive majority of the water will be used in the crystallisation reaction. I will hoever do some research amonst my European colleagues who use gypsum based far far more and come back to you. [/QUOTE]
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