Jay C. White Cloud wrote:John, do you not worry about the formaldehydes and other toxins that are in the matrix of modern wall boards? It goes to landfills for a reason (wish it didn't go there but we really do not have a choice I guess.) Just perhaps a silly concern on my part.
Dale Hodgins wrote:Drywall made before 1980 often contains asbestos. If you go that route, get new scraps from a building site. PNW soils are acidic. Gypsum adds to acidity.
Drywall is banned from the dumps here and instead gets recycled into new drywall. The recycled stuff has traces of all sorts of paints and additives and the sulfuric acid used in the process, makes it quite acidic.
John Elliott wrote:
And heavy metals? Where did that come from?
Edith Stacey wrote:I'm not convinced that gypsum adds to ski acidity.
It is aka calcium sulfate, (expressed as CaSO42H20), and is often recommended in the Pacific North West to boost calcium levels, altho' there are other alternatives for that such as agricultural lime (largely Calcium carbonate) or even dolomite lime (calcium magnesium carbonate CaMg(CO3)2) which are more commonly recommended and/or used.