Help - waterproofing fibre screed on a first floor beam and block floor

[Matt22]

Hello 

I’ve got a balcony floor that I need to waterproof. It’s above some bedrooms 

we have a beam and block floor, then a rubber membrane then 100mm fibre screed

since the screed has gone down we’ve started to Get leaks inside the house we believe the rubber membrane has been pierced when the screed went down as we had no leaks for the 8 weeks that the rubber membrane was down pre screed. 
 

we are looking for advice on any products for waterproofing the screed based on past use / experience 

 

any advice recommendations welcome 

 

thanks for you help 

 

matt

 

 

Edited June 12, 2022 by Matt22

[markc]

What’s going on top of the screed? If tiling then liquid tanking and a properly laid membrane would do the trick

[Matt22]

Thanks Markc

yes we’re tiling on top - planning to have an anti fracture Mat then S1 grade adhesive and 10mm porcelain tiles. 
Do you have any advice on brands of liquid tanking 

thanks again 

 

[markc]

1 hour ago, Matt22 said:

Thanks Markc

yes we’re tiling on top - planning to have an anti fracture Mat then S1 grade adhesive and 10mm porcelain tiles. 
Do you have any advice on brands of liquid tanking 

thanks again 

 

Recently been using Everbuild Aquaseal and I’m pretty impressed with it

[ADLIan]

Buried, or podium, roof is never a good idea unless specialist advice taken. Any insulation involved (it’s a roof!)?

 

Also potentially massive thermal bridge as roof slab becomes internal floor slab.

[Matt22]

2 hours ago, ADLIan said:

Buried, or podium, roof is never a good idea unless specialist advice taken. Any insulation involved (it’s a roof!)?

 

Also potentially massive thermal bridge as roof slab becomes internal floor slab.

Cheers ADLan- its ia purpose built balcony over a bedroom - beam and block, Celotex insulation (above what was specced for additional thermal value), rubber membrane that got damaged, and then fibre screed. We are looking at a solution that doesnt involve ripping of 100m2 of screed plus a new membrane. Oh the joys!