Classi-seal

[Blunt Tool]

I have used this a few times on shower trays after being recommended on here from guys who create excellent work and I respect very much and by no means weekend warriors and it hasn’t been thick, obtrusive away from wall at the corner or any other negative it’s useless even tho I’ve never used it throw away comments! Kerdi is not the only solution for total waterproof guaranteed installation, there are lots and always comes down to the installers experience and confidence to install correctly. It is a very good option if used and installed correctly like any good product!

 

[Flintstone]

I suspect myself, And others have seen it when it’s been installed badly

 

[LM]

I insist on them on large new build housing sites in conjunction with tanking.
If the shower tray/bath are of good quality and square vertically i.e: the upstand and top are 90 degrees rather than sloped from a cross section point of view then the Classi seal installed correctly is no obstruction at all, it's only about 1-1.5mm thick.
If when installing it the plumbers Silicon it to the wall and have it nipped around the corner of the tray properly and not stretched it, then held the corner in place with a piece of wood scrwed to the wall until the Silicon sets, when we come to tank it it's not in the way what so ever, it's a clean 90 degree and vertical internal angle.
I do agree that there are other options out there but I haven't found any that are more cost effective when tanking large volumes of new houses with a restrictive cost to build.

 

[One Day]

 

[Andy Allen]

Always new exercising was bad for you..!!

 

[Pattiler]

Its very common on sites over here, getting more common in domestic applications as well. Its better in my opinion than plumber applied Silicon that wont stick to the dusty wall. However most of them have them too tight around the corners and i have to cut the seal (thus rendering it useless & i fill it with Silicon instead) to get a tile to fit right in. So as Dave says if fitted correctly they seem fine.

Better just tanking the whole thing in my opinion though.

Have any of you guys had experience with the black adhesive on the seal creeping under the Silicon seal, between tray and tile? happened to me 3 times now