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Michael Thomas 01-30-2010 01:55 PM

Caulk 1/4" gap?
After removing the old caulk above a tub, I discovered that there is a 3/16" - 1/4" gap between the bottom of the tile and the tub:

Can I caulk this wide a gap with silicon sealant by using a backer rod, or do I need to first somehow reduce the gap?

GardenConcepts 01-31-2010 06:35 AM

Silicone caulk and backer rod is exactly what I have done. Back when green board was used a a tile backer, it was recommended to leave about a 1/4" or 1/2" gap from the tub so water would not wick up into the drywall- the tub has a lip that you don't see, so the water can't get behind the wall. That gap with the tile isn't too bad. If the tile was tight to the tub you might have issues if anything moves/settles.

Michael Thomas 01-31-2010 08:19 AM


Gary in WA 01-31-2010 04:41 PM

Here is the reason for the hour-glass shape of caulk made by the backer rod:

Be safe, Gary

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