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[quote]QUOTE: Originally posted by Capt Bob Johnson Tom, Blueboard is plain old sheet rock with a water resistant treatment. Hardiboard is a cement/slica sand mix. No way would I use a gypsum board outdoors! There are several brands of the cementitious type backer boards, most have some wire or fiber reinforcing in or on them that make them more difficult to get a clean cut! [/quote] david, i've used the above type materials professionally over a number of years and i can tell you they are the most difficult and frustrating materials in all the construction trades. the cement panels with the nylon netting inside (wonderboard!, hardiboard?) resists any kind of clean cut and crumbles if not buried under tile. the oil impregnated sheetrock (greenboard!, blueboard?) resists gluing (kind of like your thompsons waterseal fiasco). tile cement is the glue designed for this stuff (i would go with some of the above advice for your glue because i hate tile cement also). if you are just going for the weight; why not plaster or stucco, or just a big rock inside to weigh it down, or scratchbuild a palace out of marble. good luck, -rrick
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