bathroom floor - slate

[high.rise]

we're about to lay slate tiels in our bathroom. The existing floorboards have been lifted by the previous owner and replaced with chipboard (about 20mm thick) this is screwed down in 6inch centres and seems pretty sturdy. The chipboard is laid in sections, some small, some large, does this matter? we were concerned about the number if bits of chipboard butting up against each other, ie the number of joints. Would be be as well laying another layer of marine ply on top of the chipboard, just to err on the side of caution?

Thanks.

 

[Jasonb]

The chip board is not strong enough to support natural stone even if in full sheets.

Either make sure there are noggins under all the joints then overlay with 12mm WBP ply screwed at 200cts or auapanel bedded in tile adhesive & screwed at 200 cts.

Or take up all the chipboard and replace with 25mm WBP plywood with noggins under joints and screwed at 200mm cts.

Then tile onto this using a flexible adhesive and flexible grout, not forgetting to seal the slate before grouting.

Jason

 

[Gary59]

Now thats the type of professional advice I love to read........

 

[high.rise]

many thanks.

 

[Moz]

or do the job right ..lol

take up chipboard ....

then replace with "18" mm wbp/marine ply on joists that have been strengthened with noggins an the whole wood substrate (underneath base ) treated with wood preserve liberally ,
then ply down an scewed at 200 centres marking floor of pipes /cables before hand ,
then put down underfloor heating in electric form or wet form ,
tile over with BAL MARINE TILING SYSTEM,or part flex mud /adhesive mix , an BAL FLEXGROUT, or flex grout ,
allowing on the tile design for expansion joints at edges no more than 3mm filled with sealant NOT GROUT !!!


if shower wet area , get it tanked with BAL WP1 TANKING SYSTEM, brilliant stuff to work with ..
BEFORE TILING !
Hope this helps ....