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This is about a Victorian conversion property I am buying. I agreed purchase on condition that I fitted out 2 bathrooms.
Builder has constructed the following floor structure:
"The floor make up is as follows.
22mm chipboard glued joints and onto the Ecojoist.
6mm Accusti rubber mat laid over the chipboard c/w foam edging strip
15mm plasterboard plank
25mm polystyrene heat tray
18mm glued joint chipboard."
So apart from the first 22mm chipboard layer glued onto the Ecojoist, nothing is fixed, top layer is interlocking glued chipboard.
UFH manufacturer is Hetta (Swedish) who appear to distribute exclusively through www.ufhtradedirect.co.uk/.
Their brochure is View attachment HETTA UFH BROCHURE.pdf
Ufhtrade direct instruct the following
"Routed floors panel instruction:Simply lay the panels onto your existing screed/floorboards, install the pipe and cover with an interlocking plywood or chipboard floor. Floor covering-Tiles:When tiling, a flexible adhesive must be used to prevent cracking, Tiles should not be laid directly on top of the routed panels."
My builder also advised this:
"Hi Alasdair
The name of the adhesive we have been recommended to use via the manufacturer re the floating floor is Bal single part fast flex. Having used Detra(sic) matting in the past we have found that this does not allow for lateral movement and therefore the tiles crack. This rubberised adhesive should perform far better."
Apart from the comments about builders not knowing their **** from their elbow, I really need some informed advice about how to handle this. I have personally never even tiled directly onto chipboard, never mind over UFH, never mind floating. This is my own property so I cant walk away from it, I really need to have tiled bathroom floors which should be a minimum requirement in my view so I need to solve this.
As an aside, there are 5 other apartments in this development which is covered by the developers equivalent of NHBC, if the builder tiles all other bathrooms in this manner and they fail, he'll have an expensive job to correct.
Builder has constructed the following floor structure:
"The floor make up is as follows.
22mm chipboard glued joints and onto the Ecojoist.
6mm Accusti rubber mat laid over the chipboard c/w foam edging strip
15mm plasterboard plank
25mm polystyrene heat tray
18mm glued joint chipboard."
So apart from the first 22mm chipboard layer glued onto the Ecojoist, nothing is fixed, top layer is interlocking glued chipboard.
UFH manufacturer is Hetta (Swedish) who appear to distribute exclusively through www.ufhtradedirect.co.uk/.
Their brochure is View attachment HETTA UFH BROCHURE.pdf
Ufhtrade direct instruct the following
"Routed floors panel instruction:Simply lay the panels onto your existing screed/floorboards, install the pipe and cover with an interlocking plywood or chipboard floor. Floor covering-Tiles:When tiling, a flexible adhesive must be used to prevent cracking, Tiles should not be laid directly on top of the routed panels."
My builder also advised this:
"Hi Alasdair
The name of the adhesive we have been recommended to use via the manufacturer re the floating floor is Bal single part fast flex. Having used Detra(sic) matting in the past we have found that this does not allow for lateral movement and therefore the tiles crack. This rubberised adhesive should perform far better."
Apart from the comments about builders not knowing their **** from their elbow, I really need some informed advice about how to handle this. I have personally never even tiled directly onto chipboard, never mind over UFH, never mind floating. This is my own property so I cant walk away from it, I really need to have tiled bathroom floors which should be a minimum requirement in my view so I need to solve this.
As an aside, there are 5 other apartments in this development which is covered by the developers equivalent of NHBC, if the builder tiles all other bathrooms in this manner and they fail, he'll have an expensive job to correct.
sorry admins 
