JerryD
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I generally supply and fit Aqualisa showers and fitting them into a cavity wall can be a problem as, by the time you've chopped out a big enough recess for the valve, you're right through the blockwork.
What I do if I can, is reverse fix a panel of 18mm wbp ply to the back of the block, through the opening I have chopped out. This ply is fixed to the block using 120mm or 150mm rustproof screws.
The screws need to be this long to go through the block 100mm and to grab the ply and pull it tight to the back of the opening.
To fit the ply is a bit of a balancing act. I screw in a long screw into the middle of the ply to act as a temporary handle, poke the ply through the block and thread it into the cavity, then pull it back against the blocks using the screw handle.
You can then fix it properly with a long screw in each corner and then remove the 'handle'.
This ply can then form the backboard for your valve installation. Often you have to pack out against this ply as it may be too deep for your particular valve.
Hope this helps.
btw, the ply (being wbp) will be fine in the cavity as long as there is insulation between it and the outer brickwork.
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