scratched water proofing membrane

[MKP]

I have just completed a removal of old grout from my shower recess, but in the process I have scratched some water proofing layer behind the old grout.

What is the best way of sealing it before I put the new grout on?

The groove (spaces) between tiles are not wide enough for paintbrush to put a new layer of water proofing material. The water proofing paste is to thick to put in such a small groove.

I have some bondcrete I could apply with a tiny paint brush. Is this sensible? It is not suitable for wet areas, but if there is a layer of grout in front of it, it should not get wet with regular use of shower.

if I do this will the old grout still stick ok?

I have also bought the grout sealer to put over the grout; to minimnise any chance of water going behind the tiles.

Anyone with experience/comment will be greatly appreciated

 

[marg4000]

I would seek expert advice. Unless the new waterproofing is bonded correctly and sufficiently to the "old" it may fail. Saving a few $$$ now may lead to future problems.
Marg

 

[Joe D]

Companies such as Megasealed use a flexible grout product to seal the shower tiles without removing them.

http://www.megasealed.com.au/products-and-services/leaking-shower

I suggest you find out what product these use and do similar.

 

[willair]

I have just completed a removal of old grout from my shower recess, but in the process I have scratched some water proofing layer behind the old grout.

What is the best way of sealing it before I put the new grout on?

The groove (spaces) between tiles are not wide enough for paintbrush to put a new layer of water proofing material. The water proofing paste is to thick to put in such a small groove.

I have some bondcrete I could apply with a tiny paint brush. Is this sensible? It is not suitable for wet areas, but if there is a layer of grout in front of it, it should not get wet with regular use of shower.

if I do this will the old grout still stick ok?

I have also bought the grout sealer to put over the grout; to minimnise any chance of water going behind the tiles.

Anyone with experience/comment will be greatly appreciated

Depending on what's below the bath area,,high grade silicone would seal the break off from water proofing just spend the extra few dollars on something high grade..
http://www.ramset.com.au/Product/Section/39/Sealant

 

[mflying]

you can try this

http://www.bunnings.com.au/sealant-shower-plug-220ml-can_p1585225

We used that in one of our IP bathroom.. it hasn't leaked since(been 12 months so far).

 

[MKP]

Do you know if this sealer is liquid (thin) or like the common silicon sealant (gel?). If its not thin and runny, then the application of this sealer will be tricky as the grout line is only about 3mm.
Will the new grout stick to this material?
MKP

Depending on what's below the bath area,,high grade silicone would seal the break off from water proofing just spend the extra few dollars on something high grade..
http://www.ramset.com.au/Product/Section/39/Sealant

 

[MKP]

Hi Mflying. I have used the blue thin sealer on cracket tiles before. But for this problem, did you put this sealant before the grout? If its solvent based, will it dissolve some old sealant under the tiles? But if you haven't had problem after 12 months, it may worth a try.
Megaseald people are not easy to get.
MKP

you can try this

http://www.bunnings.com.au/sealant-shower-plug-220ml-can_p1585225

We used that in one of our IP bathroom.. it hasn't leaked since(been 12 months so far).

 

[gerd]

I have just completed a removal of old grout from my shower recess, but in the process I have scratched some water proofing layer behind the old grout.

If its the walls of the shower recess use a sand and cement based grout such as Davco, ad a waterproofing additive when mixing grout and apply as per instructions.

Gerd

 

[MKP]

Hi Gerd,
Thanks for sharing your experience.
Is the waterproofing additive you used also made by DAVCO?
If not, what brand do you use? Can I get it from Bunnings?
How long ago did you put it on yours?

I have not had a heart to move on with the grouting. I have painstakingly painted the grout lines with 1 layer of bondcrete followed up with 2 layers of waterproofing materials (still have some depth for grout).

The tile shop told me about epoxy grout, but apparently it is hard to apply and they don't have anyone that can do it. I am currently looking for someone that can do it for me. But few tilers I called said its a specialised job and they can't do it, so I will keep ringing around for another person (waiting for a person from Tile Rescue to call me back).

The waterproofing layer needs 48 hours to cure, so if nobody reply by then I will have to do the grouting myself either learn to deal with the resin or your suggestion.

I have obtained some FS-DD grout from ARDEX (recommended by the tile shop as the next best ofter epoxy), but still have the epoxy grout in my mind.

I have just completed a removal of old grout from my shower recess, but in the process I have scratched some water proofing layer behind the old grout.

If its the walls of the shower recess use a sand and cement based grout such as Davco, ad a waterproofing additive when mixing grout and apply as per instructions.

Gerd