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Prep for tiling windowsill

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26 Jul 2025
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I have had a window knocked through a 18 inch solid stone wall above a hand basin in my cloakroom. The window is about 45 cm wide and the sill has been finished off with an aqua-seal board. I need to raise the window sill surface by about 15 mm so the tiles I am using marry up with those already on the wall. Suggestions for a quick solution please.
 

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