Hi.

I've just fitted my shower-bath in place, using a large bead of mastic around the edge to help fix it against the walls.

I am about to tank the area with the BAL Waterproofing kit and I've been told to lay the tape from the rendered wall onto the edge of the bath, by an amount small enough to be covered by the forthcoming tiles. However, It says on the instructions that the tape is used to bridge gaps upto 1.5mm , but some of mine are larger than that due to uneven-ness in the render. Due to the curveness of the bathtop, and the uneven walls, some of the gaps are almost 5mm.

Should I fill up the gap using another bead of mastic ontop of the one that holds my bath to the wall, or should I bridge the gap with the tape without filling the holes with mastic ?

I've attached a picture of what I mean, and shown where the bead of mastic is currently.
Thanks for any advice

Fill the gap with silicone so that its flush with the bath, bring the tape over this when its dry.

only a suggestion but it might be beneficial to recess bath into wall would make a stronger job

have a look at this will explain what i mean http://www.google.com.au/url?sa=t&so...ncN8YG5sYelSCg

Hi, thanks for the advice.

Am I right in thinking that the new bead of silicon wont stick to the existing?

Will that be a problem or doesn't it matter as its only so the waterproofing tape has something to support it ?

hi the mastic used behind waterproofing tape is a bondbreaker to prevent the tape from sticking to both surfaces at one tight point (allows tape to flex)so no it doesn't have to stick 100% hope this helps

you could chase the wall out a little and slot the bath in

Sounds like a job for Sealux: Sealux Seals - A professional shower tray & bath seal