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Question DetailsAsked on 1/29/2015

old shower block glass wall repairs- who does it?

There are holes in where the cement and glass block wall have settled over the past years. How do you repair the cement and who would we call? Thanks

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A glass block wall for a shower should not have been assembled with "grout" - if you mean cementatious grout like used for concrete building block or ceramic tile. Does not stick well, and is a "hard" filler that causes glass block breakage in event of movement of the walls. It should (unless many decades old) have been assembled with either urethane adhesive like is used to put windshields in, or a special glass block mastic adhesive, commonly with silicone tub and tile caulk at the surfaces for desired color and waterproofing. Blocks made specifically for shower enclosures sometimes come with a clamp and gasketing system that holds them together without adhesive.


If grout is cracking up and falling out or disintegrating to powder, wall should be taken apart and rebuilt. If just spalling a bit at the surface, you can use latex concrete caulk (comes in regular caulk tubes) to patch it if cement colored, or a tub and tile caulk like Dap if white or beige or brown. Carefully, without breaking glass, use a very small screwdriver or pocket knife to dig out chunks of loose grout first, then caulk. Bear in mind whatever color caulk you use will show through the edges of the blocks too, so if surface if different color than deeper in, you may need to do two passes - one for the deeper grout which will show through edges of blocks, then second color for the surficial grout lines. If you have a choice on caulks, tub and tile is better than concrete caulk, especially if it has (as it should) mildewcides in it.

Answered 4 years ago by LCD




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