First time laying Hardie on Saturday

[mache]

hi bud, I wouldn't of commented without knowledge. I will deffinately try to find out what system has been used. all i know is an impey system has been used throughout all of the building sites i currently am working on and it has not gone well, 12 months down the line they are all failing and it is not down to installation. and very recently a wetroom repair that had previously been repaired they tried to strengthen underneath the tray for a second time and once my big backside stood on top was bouncing (i could even see it moving let alone the guy with his eye against the ground)... its costing thousands per property as it is all mosaic stone too!

Don't get me wrong, not doubting what you found, but would be interested to hear more about what was installed if you can find out. e.g. if the trays were the older flat bottom or the matrix ribbed versions. Membrane identification should be fairly easy as it will be the bitumen based tilesafe or the waterguard co polymer. Any word on site with regard response from Impey on reason for failure? sounds like a site of this size the first port of call would be to get the manufacturers in for investigation. Please do post what information you find as I am interested.

 

[Mr Tiler]

Don't get me wrong, not doubting what you found, but would be interested to hear more about what was installed if you can find out. e.g. if the trays were the older flat bottom or the matrix ribbed versions. Membrane identification should be fairly easy as it will be the bitumen based tilesafe or the waterguard co polymer. Any word on site with regard response from Impey on reason for failure? sounds like a site of this size the first port of call would be to get the manufacturers in for investigation. Please do post what information you find as I am interested.

well as you stated yourself mate it will be bitumen based as already stated you cant use Silicon in any areas which is ridiculous and should be unheard of, as for the rest I can not comment but will by the end of next week when I have a chat with the gaffa. main reason for failure is both tanking membrane and tray.... the tray after a unreal amount of strength was still bouncing and the tanking system was failing... even once pulling up the bitumen we found that it was damp underneath so what does that say? and that specific room hadn't been used in a week or so

 

[Bathfix Bob]

When screwing down the Hardiebacker.....I find myself putting more screws round the edges than are needed at around 100mm centres.

Does anyone else do this for added piece of mind or am I wasting screws?

 

[TJ Smiler]

If you are having underfloor heating why not use insulation boards rather than Hardie, same price but much easier to cut and designed for UF................Or have i missed something on this thread?

 

[Qwerty]

If you are having underfloor heating why not use insulation boards rather than Hardie, same price but much easier to cut and designed for UF................Or have i missed something on this thread?

You are quite right, I thought the same.

 

[Andy Allen]

same here, would be using 10mm marmox boards myself..