wetroom grout concern

[bananaspark]

What the best grout width for a a continuously wet area? [using porcelain large format tiles, bal BP1 and fastflex.]

I've made a small trial run on a sheet of ply and am a bit concerned that the rubber adhesive is a bit more absorbent of water than cement based ones, so reckon grouting will be critical. considered epoxy but there's no mention of it being 'flexible', - unlike of course flexible grout.

added to that, the bp1 kit mentions using microseal sealant for the expansion gap round the edge of the floor.
a freezing floor on a winter morning being hit by 50 degree water for half an hour would sure cause movement, but how much? enough to crack the epoxy? does that mean I dont grout at all where the microseal silicone would go?

too many questions
b/

 

[Jasonb]

Don't use epoxy as it is not flexible.

Add some GT1 to your BAL widejoint grout as this makes it more flexible.

JAson

 

[gcol]

a freezing floor on a winter morning being hit by 50 degree water......

Christ you like it hot don't you!

Flexible epoxy grout is available, but I haven't and wouldn't use it. http://www.tam.uk.com/epoxies_and_polymers/tamrez_440_flexible_epoxy_grout.php

 

[bananaspark]

not just the hot water! - i was contemplating putting one of those infra red sauna lamps in there as well as electric ufh,
plus an ice bucket like you get in them posh gyms

this would be one almighty test of the wetroom, i dont think the bal 2 part rapid flex is up to it, as it says water resistant not waterproof, cant remember where but i did see a waterproof flex...

b.