hole in concret wall

[deborahd]

HI guys i need some help, i have a garage that is made out of grey block and has a cement render on it, some of the render has come off, leaving quite a big hole, how can i fill the hole without the cement sagging.
I am assuming i make a mix of 2 to 1, but i have had problems in the past with the sag.

look forward to some good advice

thank you

 

[pompeyal]

How deep is this hole, you could put it on in layers and scratch each before the final coat of 8 - 10 mm.

 

[deborahd]

The hole is about 10 inches by 12 inches, and it is 6 inches deep.
I have chipped out the loose bits, and i am ready to fill it.

 

[merlin50]

less water

 

[pompeyal]

To fill the depth break up some old bricks and build them in so they are sub flush, leaving them rough to give a key and once they are set render over to finish. lightly wet around the hole before building into it and this will help the mortar adhere.