G
gnnmartin
My son has a bathroom tiled by the previous owner. The tiles are set directly onto foil backed 9mm plasterboard mounted on a timber frame. There is a shower cubicle in one corner. Water as seeped between the shower base and the wall tiles (we think), and the foil backing on one side of the plasterboard together with the tile cladding on the other has meant there is no way for the water to evaporate away. The water has been drawn by capillary action over a several feet of the plaster board, resulting in a foul black mould under the tiles, and a sodden denatured plasterboard. We are currently breaking out the tiles and cutting away the plasterboard.
The cheapest replacement we've considered is to put back foil backed plasterboard, but back to front, with the foil outwards, and tile onto that. The hope is that if any water does seep through to the plasterboard, it can evaporate away into the cavity in the stud wall. We will ensure the cavity is ventilated into the neighbouring hall. Are we being too cheapskate? Am I right in assuming that the paper finish to the (nominal) front face of a foil backed plasterboard is vapour permeable?
The next more expensive solution is to replace the plaster board with 9mm Hardibacker, and tile onto that. Can one screw 9mm Hardibacker directly to the studs without any backing support? I guess it is as strong as plasterboard, so I guess the answer is yes, but I haven't found anything actually saying that Hardibacker can be used in this way.
In either case we thought we might use the 'flashing' extras sold as part of the the Homelux seal system broken link removed to seal between the tiles/backer and the shower base, and in the corner of the wall. I'm slightly concerned whether mixing systems like this is asking for problems.
Any comments will be much appreciated.
Nigel Martin
PS. I did hesitate about putting it in the 'hi' forum: sorry if I got it wrong!
The cheapest replacement we've considered is to put back foil backed plasterboard, but back to front, with the foil outwards, and tile onto that. The hope is that if any water does seep through to the plasterboard, it can evaporate away into the cavity in the stud wall. We will ensure the cavity is ventilated into the neighbouring hall. Are we being too cheapskate? Am I right in assuming that the paper finish to the (nominal) front face of a foil backed plasterboard is vapour permeable?
The next more expensive solution is to replace the plaster board with 9mm Hardibacker, and tile onto that. Can one screw 9mm Hardibacker directly to the studs without any backing support? I guess it is as strong as plasterboard, so I guess the answer is yes, but I haven't found anything actually saying that Hardibacker can be used in this way.
In either case we thought we might use the 'flashing' extras sold as part of the the Homelux seal system broken link removed to seal between the tiles/backer and the shower base, and in the corner of the wall. I'm slightly concerned whether mixing systems like this is asking for problems.
Any comments will be much appreciated.
Nigel Martin
PS. I did hesitate about putting it in the 'hi' forum: sorry if I got it wrong!
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