Waterline tile install and future cracking

Coz

Silver Supporter
Jul 10, 2022
44
South Carolina
Pool Size
15000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-15
I am pondering installing waterline tile to conceal large mortar joints on my coping. The coping hasn't been installed yet, but the fiberglass shell is "off level" enough that one corner will have an inch of mortar. The tile will cover this up the mortar joint and make the whole shell appear to be level.

I am concerned about the joint between the mortar and fiberglass shell. I know there will be some microscopic movement and I'm worried about it causing future cracking in the tiles. Is my concern valid or does the silicone allow enough movement to prevent cracking?

Thanks
Jim
 

duraleigh

Admin
Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
36,109
Sebring, Florida
They will use mastic and grout made for that application,

Cementitious grout (Is that a word??) is too brittle (like you said) and will crack. Not completely sure but I think a 2-part epoxy will do the job. You are not attempting this DIY, are you? Count on your tile company to get it right.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
43,734
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
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Coz

Silver Supporter
Jul 10, 2022
44
South Carolina
Pool Size
15000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-15
They will use mastic and grout made for that application,

Cementitious grout (Is that a word??) is too brittle (like you said) and will crack. Not completely sure but I think a 2-part epoxy will do the job. You are not attempting this DIY, are you? Count on your tile company to get it right.
Ok, got it, you are saying the mastic/epoxy will allow some flex, along with flexible grout/silicone, and cracks won't form. Good! Yes, I have a recommendation on a professional installer.
 
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