Hi. Retiling the bathroom. 2 walls solid brick and block, 2 plasterboard stud. Old tiles are std 6x6 inch ceramic. New will be large natural marble. Do I need to fix HardiBoard as well (on top of) the existing plasterboard when the lod tiles are off, or, can I just fix marble to the existing plasterboard?
600x600 will be far to heavy for plasterboard. You will need to remove plasterboard Depending on the strength of the joist? (add noggins if ness) and then fix 12mm Hardibacker Read below......... When considering what tile you choose there are things to consider, which are beyond the normal considerations of colour, finish and appearance. These considerations are often practical and thus can be missed by the normal tile shopper. One of these considerations that is not already covered in our how to choose tiles guide is weight. The weight of your tile and the weight limits for various substrates/surfaces, should be considered before choosing your tile. Here is a table outlining the various weights taken from the British Standards for Tiling and Tilers: Substrate Type Plaster Walls and Skimmed Plaster Board Plywood Walls Plaster Board Walls (Unskimmed) Tile Backer Board Walls Block Work Walls Rendered Walls Weight Limit per square metre 20kg per m2 30kg per m2 32kg per m2 40-50kg per m2 40-50kg per m2 40-50kg per m2 It is always best to consider this before sourcing your tiles. A approximate guide for weights of tiles before adhesive is here: Tile Type Ceramic Porcelain (8mm thick) Porcelain (10mm thick) Natural Stone (10mm thick) Natural Stone (20mm thick) Weight per square metre 12kg per m2 20kg per m2 25kg per m2 28kg per m2 35kg per m2
Just to add. It will be quicker to rip off the old plasterboard and fit new HardieBacker than to get the original board to a state where you can tile or put backer on top.
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