I've gone for Hardibacker 500 on the internal walls. Am I right in thinking I can tile directly onto them with a white spf adhesive, no need to prime?
I'm debating what to do with the external brick walls. If I Hardie those too, i understand i need to plug and screw them to the wall and put adhesive behind them to stop the screws/uneven wall cracking the board. Is this correct? If so, what sort of adhesive should i use to stick the hardibacker to the brickwork?
Its going to cost at least another £100 to board over the bricks plus the adhesive i need 🙁 What should i expect to pay to have 8m^2 of wall professionally rendered with cement/sand?
Leo!!.. you need to read your spec sheet on Hardi backer boards.. they are not fully waterproof... just water resistant.. as in they do not break down in constant contact with wetting.
Weight per sq metre (Kg) for 3mm thin bed solid bed adhesive application
Weight per sq metre (Kg) for 6mm thick bed solid bed adhesive application
6mm thick glazed tile
14.26 Kg/m2
18.46 Kg/m2
8mm thick glazed tile
17.62 Kg/m2
21.82 Kg/m2
10mm thick glazed tile
20.97 Kg/m2
25.17 Kg/m2
12mm thick glazed tile
24.32 Kg/m2
28.52 Kg/m2
12mm thick quarry
26.40 Kg/m2
30.06 Kg/m2
10mm thick porcelain
23.88 Kg/m2
28.09 Kg/m2
12mm thick porcelain
27.82 Kg/m2
32.00 Kg/m2
10mm thick natural stone
31.10 Kg/m2
35.30 Kg/m2
12mm thick natural stone
36.48 Kg/m2
40.68 Kg/m2
20mm thick natural stone
58.00 Kg/m2
62.20 Kg/m2
Tiles of over 8mm thick should not be fixed to plaster (maximum permitted weight is 20Kg/m2), however all the tiles above could be fixed to Marmox tile backer board. Maximum Permitted Weights
These are maximum permitted weights per m2 of tiles and adhesive combined:
Note: this information is for guidance only and can vary depending on the type of adhesive and density of the tile being used. Always check before fixing as no liability will be accepted. Cement based adhesives have a mass of approximately 1.4Kg per mm thickness. Porous body glazed tiles have a mass of approximately 1677Kg/m3, quarry tiles 1850Kg/m3, Porcelain 1968Kg/m3 and natural stone 2690Kg/m3.