I am blocking up a small window today. It's about 2 by 3 feet and I have some 'lite' blocks to do it.
The outside wall is rendered and painted so I need to get the finish as flush as possible.
Can anyone tell me roughly what depth I should be looking to leave for the sand/cement skim I will cover the blocks with. Obviously, too thin and it is likely to just fall off but too thick and the mortar may slump.
Any other tips? Other than pushing some newspaper down the cavity to catch the mortar drops on the inside.
Thank you. Rob
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