window cill overhang

[Moonshine]

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 - ?

[markc]

No minimum, you just need to make sure the drip channel is clear of the render or cladding to allow drips to fall

[nod]

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 

[Moonshine]

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

[Bitpipe]

50mm is a decent overhang to minimise stains from drips on render.

[nod]

3 minutes ago, Moonshine said:

 

That's internal, I was after external, but good to know

Much as you can ?

[joe90]

21 minutes ago, nod said:

Much as you can ?

yes as long as it looks “right”.

[tonyshouse]

70mm overhang for me 

[craig]

30mm to 50mm, no less than 30mm is recommended.

[Oz07]

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. 

[Moonshine]

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