Moonshine Posted March 11, 2021 Share Posted March 11, 2021 Is there a recommended overhand for window cills from a render or cladded façade? I want to size up window cills to have a minimum 30mm rebate into the cavity. Cavity rebate - 30mm Block - 100mm Render - 20mm Overhang - ? Link to comment Share on other sites More sharing options...
markc Posted March 11, 2021 Share Posted March 11, 2021 No minimum, you just need to make sure the drip channel is clear of the render or cladding to allow drips to fall 1 Link to comment Share on other sites More sharing options...
nod Posted March 11, 2021 Share Posted March 11, 2021 1 hour ago, Moonshine said: Is there a recommended overhand for window cills from a render or cladded façade? I want to size up window cills to have a minimum 30mm rebate into the cavity. Cavity rebate - 30mm Block - 100mm Render - 20mm Overhang - ? I like to see 70 mil past the block leaving 35 after plastering Link to comment Share on other sites More sharing options...
Moonshine Posted March 11, 2021 Author Share Posted March 11, 2021 29 minutes ago, nod said: I like to see 70 mil past the block leaving 35 after plastering That's internal, I was after external, but good to know Link to comment Share on other sites More sharing options...
Bitpipe Posted March 11, 2021 Share Posted March 11, 2021 50mm is a decent overhang to minimise stains from drips on render. 1 Link to comment Share on other sites More sharing options...
nod Posted March 11, 2021 Share Posted March 11, 2021 3 minutes ago, Moonshine said: That's internal, I was after external, but good to know Much as you can ? Link to comment Share on other sites More sharing options...
joe90 Posted March 11, 2021 Share Posted March 11, 2021 21 minutes ago, nod said: Much as you can ? yes as long as it looks “right”. 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted March 11, 2021 Share Posted March 11, 2021 70mm overhang for me Link to comment Share on other sites More sharing options...
craig Posted March 12, 2021 Share Posted March 12, 2021 30mm to 50mm, no less than 30mm is recommended. 1 Link to comment Share on other sites More sharing options...
Oz07 Posted March 13, 2021 Share Posted March 13, 2021 Mine have 150 cill on a 70mm profile and front of cill is about flush with brickwork. I have two course of plinth brick below. You know the 30mm cavity overhang is a minimum? Next size up is a 180 cill? Might be safer with that. Link to comment Share on other sites More sharing options...
Moonshine Posted March 13, 2021 Author Share Posted March 13, 2021 2 minutes ago, Oz07 said: You know the 30mm cavity overhang is a minimum? Next size up is a 180 cill? Might be safer with that. Yep, thanks for checking. I think 180cm would be the minimum, though a 210cm maybe too big on the render finish I will probably the 210cm on two windows one facades with timber cladding, as rather than 20mm render it's about 45mm or cladding 1 Link to comment Share on other sites More sharing options...
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