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Claude_C
Re-Caulking improperly fixed acrylic shower base
Claude_C

Hi everyone,

I would like your advice on how to repair an improperly fixed acrylic shower base without redoing the job e.g. the whole bathroom.

The base was put in place by the installation team with concrete beneath the base and not fixed on the wall as the manufacturer suggested. With the base in flexion, silicone caulking peeled off.

I removed all the silicone caulking. The first line of grout between the base and first layer of tile seems to crack and move a bit and I’m in the process of removing it.

A low expansion “no warp” foam was applied beneath the base successfully by openings in the walls and the basement floor. When a load is placed in the base, movement is almost not perceptible. The base doesn’t seems to flex.

Now my question:

Do I re grout the gap between the tub and the first row of ceramic tile or do I leave it like this and apply silicone all around the base and the caulk will penetrate the gap ?

Opinions seems to differ on this:

If not grout:

Gap too large for the caulking to cure as silicone will penetrate this gap?
More space for silicone to adhere so better?
Difficult to remove silicone this way if it need to be recaulked in the future ?

If grout:
Someone suggested to groove it a bit to better adherence.

A couple of bags of cement (as temporary load) will be placed in the base while the silicone caulk is apply and for curing.

Thanks

Claude

HoustonRemodeler
Re: Re-Caulking improperly fixed acrylic shower base
HoustonRemodeler

Claude,

That gap is always caulked with 100% silicone. Any latex will mold.

Claude_C
Re: Re-Caulking improperly fixed acrylic shower base
Claude_C

So no grout, Just silicone caulk ?

HoustonRemodeler
Re: Re-Caulking improperly fixed acrylic shower base
HoustonRemodeler

Correct, 100% silicone only

Claude_C
Re: Re-Caulking improperly fixed acrylic shower base
Claude_C

Thanks for the info !

dj1
Re: Re-Caulking improperly fixed acrylic shower base
dj1

How wide is the gap?

Claude_C
Re: Re-Caulking improperly fixed acrylic shower base
Claude_C

Hi,

The gap varies from tiles to tiles with a maximum of 5 mm (3/16 in) to a minimum of 2 mm (1/16 in)
Depth is around 0,6 in.

It's difficult to remove grout when it's 1/16. Elsewhere it is already cracked.

Silicone caulk available in Montréal is mostly GE and Dow Corning 786.

Regards,
C.C.

HoustonRemodeler
Re: Re-Caulking improperly fixed acrylic shower base
HoustonRemodeler

That size gap will be ok to caulk. Removing the old grout is never a pleasant chore.

Claude_C
Re: Re-Caulking improperly fixed acrylic shower base
Claude_C

Thanks for the info,

One inch at a time !

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