J
Jack Yerou
Hi there, I am not a tiler. I am a carrying out my first self build and would be grateful for some assistance:
I have 2 questions:
(1)My builder wants to use 6mm hardiback board on the floors in the bathrooms. This will be laid over 18mm ply. The bathrooms are to have electric under floor heating. It has been suggested to me that hardibacker may not have the necessary insulation qualities that would be adequate for underfloor heating. I could not find anything on the web about hardibacker board but did find information on Marmox which is apparently suitable as a backing board for tiling and also as insulation for under floor electric heating. My builder is saying that hardibacker is adequite because we are insulating with rockwall between the 200mm wooden joist. Does anyone have a view on this?
(2)The ground floor is to have piped under floor heating. I have had contradictory advise from two experienced tilers regarding whether a decoupling mat is necessary. The whole ground floor an area of 187 square metres will be screeded by a professional screeding company so presumably expansion joints will be allowed for. One tiler is adament that no decoupling matt should be necessary providing an appropriate flexible adhesive is used the other is insistant that a decoupling mat is necessary to prevent cracking. My understanding is that a decoupling mat will cost about £6 per square metre to buy approx. £3 per metre to lay so this is a significant additional cost. If I I was to use a decoupling mat which type is recommended and where is the best place to buy it.
I would welcome any comments.
Jack
I have 2 questions:
(1)My builder wants to use 6mm hardiback board on the floors in the bathrooms. This will be laid over 18mm ply. The bathrooms are to have electric under floor heating. It has been suggested to me that hardibacker may not have the necessary insulation qualities that would be adequate for underfloor heating. I could not find anything on the web about hardibacker board but did find information on Marmox which is apparently suitable as a backing board for tiling and also as insulation for under floor electric heating. My builder is saying that hardibacker is adequite because we are insulating with rockwall between the 200mm wooden joist. Does anyone have a view on this?
(2)The ground floor is to have piped under floor heating. I have had contradictory advise from two experienced tilers regarding whether a decoupling mat is necessary. The whole ground floor an area of 187 square metres will be screeded by a professional screeding company so presumably expansion joints will be allowed for. One tiler is adament that no decoupling matt should be necessary providing an appropriate flexible adhesive is used the other is insistant that a decoupling mat is necessary to prevent cracking. My understanding is that a decoupling mat will cost about £6 per square metre to buy approx. £3 per metre to lay so this is a significant additional cost. If I I was to use a decoupling mat which type is recommended and where is the best place to buy it.
I would welcome any comments.
Jack
