Expansion Joints (Questions about article in the library) [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile

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aluchkovsky
08-06-2004, 02:36 PM
I read 'Expansion Joints' in the Liberry and have 2 questions:

Q1:
BEGIN QUOTE
interior for ceramic mosaic tile and glazed wall tile preferred not less than 1/4", but never less than 1/8".
END QUOTE

Does this mean that in the corner for example where two tiles come together each tile will not reach the wall by 1/8" therefore creating a right triangle with 1/8" sides and in this triangle silicone caulk will go?

Q2:
BEGIN QUOTE
Materials:
back-up strip shall be a flexible and compressible type of closed-cell foam polyethylene, butyl rubber, or open cell and closed cell polyurethane, rounded at surface to contact sealant, as shown in details above, and as recommended by sealant manufacturers. It must fit neatly into the joint without compacting and to such a height to allow a sealant depth of 1/2 the width of the joint. Sealant must not bond to the back-up material.
END QUOTE

If back-up strip is compresible why is it supposed to fit without compacting and only to 1/2 height, wouldn't it just float there without being compressed?
HD sells back-up strips. Instructions on them say that the gap where the strip goes must be smaller by 1/8" than the diameter of the strip which means the strip WILL compress when you shove it into the gap.

Am I crazy? (Sorry for the 3rd question)

Thanks,

Andriy

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