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J Sid
Do not tile onto ply. Walk away if builder will not change it. It will come back and bite you in the arse. Weight limits are not even a consideration. PLY IS A NO NO .
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Welcome to TilersForums.com, the place to discuss all tiling standards whether British Standards in Wall and Floor Tiling, BS5385, or ISO European Standards for Tile Fixing.
Wall and Floor Tiling Standards for the UK: British Standards in Tiling.
Discuss Weight Limits in the Tiling Standards area at TilersForums.com.
I just did a quick search and managed to find this post by Oli, which lists the weight limits. It was a few years ago but still relevant...
http://www.tilersforums.com/tiling-forum/13313-tile-advice-all-questions-i-asked.html
Reply to Weight Limits in the Tiling Standards area at TilersForums.com