Render Mix

[paoloh]

Evening guys,

I need to render a wall about 6ft x 4ft.

What ratio sand to cement would you use?

[B17NNS]

Nobody will agree on this

I use 4-1 plastering sand - cement

I add a waterproofer too.

Apply 2 coats, 1st coat scratched and allowed to go off overnight. 2nd float coat rubbed up when ready.

[paoloh]

Would you treat the brickwork with anything first?

[Spudler]

B17NNS said:

Nobody will agree on this

I use 4-1 plastering sand - cement

I add a waterproofer too.

Apply 2 coats, 1st coat scratched and allowed to go off overnight. 2nd float coat rubbed up when ready.

Absolutly spot on.
Keep both coats at 4:1 and waterproofer in both.
If brick then use pva as per instructions.

[B17NNS]

paoloh said:

Would you treat the brickwork with anything first?

Yep PVA about 5-1 water-PVA

No real hard and fast rules though, depends on the background and the weather.

[paoloh]

Thanks chaps!

Is plaster sand available in B and Q etc etc?

Would you score the first coat?

[dave_s13]

paoloh said:

Thanks chaps!

Is plaster sand available in B and Q etc etc?

Would you score the first coat?

Yes it is and yes you do. That's why it's called a scratch coat. Put lots of scratches in it so your finish coat has a decent key.

I rendered a wall once, it's quite satisfying really

Video here kinda explains it...

http://www.youtube.com/watch?v=fzt_8tbfvVg&fea...

[paoloh]

Right, got started today and my god, it is not easy!!

Have got scratch coat, leaving over night and going for final coat tomorrow morning.

I'll update you on how I get on.

Thanks again!

[Mr GrimNasty]

1 part lime might of made it easier. Also the **** off a stick method of application keys and stays on much better than spreading if you're a novice. http://www.youtube.com/watch?v=i9hQ04tOvrE&pla...