Discuss Mixing grout with SBR in the Australia Tiling Forum area at TilersForums.com.

U

Unregistered

I have sealed the slate on previous work and it proofed to be watertight for a year or so. Let me explain the situation I'm in.
Few years ago this terrace was tiled with asbestos tiles sicked on layer of bitumen. Under the bitumen was few layers of felt and concrete deck. All of this was stripped down to bare concrete and new deck installed. New deck was covered with GRP - some fibreglass and resin. Slate tiles went on top. Now we've found out that there is a problem with GRP deck as it's leaking. Now I thought of two options:
1. find watertight grout and re-grout the whole terrace
2. lift the tiles, put another layer of 6mm plywood directly on existing deck and apply Mapelastic Aquadefense Liquid Rubber Waterproofer then re-tile.

Option 2 seems to be the best way but a bit pricey too.
Do you have any suggestions?
 
I wouldn't try chemical mixes unless specified ok by the manufactures. You can seal grout but I cant see it lasting as a long term solution.
Epoxy's good but not cheap and any movement in the tiles means gaps and waters through again.

Option two seems the only way sadly. I cant offer any advice on how best to complete this option though as I'm no roofer.
 

Lithofin BOB

TF
Esteemed
601
518
Hampshire
Grout protectors or impregnator across the stone or grout , as TS said will not protect for to long, breathable, water may still poss bleed as maintenance products not tanking, ardex do a hybrid epoxy which we tested on very anti slip tiles came of a treat, not sure for naturals, this would give you chem and water resistance but un sure on application on slate , could you do a test board with spare slates to test for release and finish.Would ring them also to discuss suitabilty with slate and movement . Perhaps the guys could comment on here on hybrid product. Can't recall name
 
D

DP Tiling

A cement based backer board and a proper tanking agent is the only answer here, the mapeilastic aqua defense is great stuff, be sure to use the mapeband around the internals too.

Slate will need to sealed with an impregnator regardless, however, due to acidity/alkalinity of rain water it needs quite a bit of maintenance in that it wears a lot quicker.

Regarding the adhesive and grout, I personally would go for Keraquick and latex plus it is very well suited to external use and it's low water content and rapid hydration makes it ideal for porous stone also it is the same manufacturer as the tanking agent and eliminates risk of chemical incompatibility. Probably wouldn't go to an epoxy grout as I can see it being difficult to fully remove haze from slates textured surface.
 
U

Unregistered

Don't mix sbr with your grout because it will be a nightmare to clean off, I tried it just the once never again...that'll teach me to try and be clever.
Thanks for that advise.

DP - I know that tanking would be ideal but now when I compare the costs of re-grouting (2 tubs of Ardex EG8 - approx £70 + good grout cutter for multi tool £40) and 2 days of work vs tanking and re-tiling will cost me approx £500 that's if I don't brake any tiles + I estimate 7-8 days of work. Re-grouting may be worth trying but only if there is a good chance of success.
 

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Mixing grout with SBR
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Australia Tiling Forum
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