Exterior render info

Joined
23 Sep 2005
Messages
23
Reaction score
1
Country
United Kingdom
Hello, I'm going to 'try' to render the rear of my dads house. The area that needs to be repair is the original pebble dash, but it's falling off in places and needs to be repaired before he can paint it.
I was hoping to help him out by removing the old pebble dash and render it myself to save him the expense.
I've read on this site, and others on my search for information on the job at hand, that you use 1 cement 1 lime 4 sand. And before applying the render you wet the wall down.
Then after applying the render leave to set a bit and then finish off with a sponge float, I have picked up the tools : trowel hawk, sponge float and a straight edge.
I've hacked off the old pebble dash. And I've repaired some loose bricks.

Before I start to apply the render I want to make sure I get it right, so if there's any tips you experts can give me before I start it would be great.
Also I've seen in the builders merchants Waterproofer agent, should I use this in with the rendering mix to help make the walls waterproof? Or will the paint do that job once applied.

Looking forward to tackling this, but at the same time a little bit in awe of the task at hand.

Thanks for your advice.
 
Sponsored Links
when you are rendering use a waterproofer for the scratch coat and lime for the finish coat. the waterproofer also improves the workability of the mix. if the area is large though i would get a tradesman in
 
Will the finish coat still adhere to the scratch coat with waterproofer in it?

The area is quite large, but there are a few windows and doors that break it up.
I was going to use a bell cast bead to split the top and bottom areas to also break up the area, giving me more time for a good job.

Thank you for your help, very much appreciated.
 
Can anyone confirm about the waterproofer? If the scratch coat is left to dry, then how will the 2nd coat adhere to a waterproofed surface?
 
Sponsored Links
because it will adhere - look the proper way to reender is:

scratch coat with waterproofer
finish coat with lime or plastisciser
 
Look the proper way to render is........actually ............with or without waterproofer in the scratch, but absolutely with waterproofer in the finished floating coat. do not use galvanised beads around windows but plastic or stainless steel. Loads more to it that has been repeated countless times before so I suggest doing a search on the subject treefella. Burkey if you dont have a clue why bother answering, someone could end up making very expensive mistakes following ill informed advise.[/b]
 
i have been a builder for 22 years and have worked in an assortment of situations, so, i believe i know what i am talking about legs so please dont assume i dont know what i am talking about when its obviously just a difference of opinion
 
ok guys thanks for your advice.
I asked the builders merchant for exterior beads, but the bellcast and the angle beads both looked galvanised to me. They never mentioned stainless or plastic.
Hope galanised will suffice.

Legs, belive me I've searched, the most info was this site.


Basicly my plan is:
Pressure wash surface to remove dust, and dampen bricks.
Apply scratch of 3:1:1
Leave to set 48 hours:
Dampen scratch, apply finish 9:2:2 Waterproofer(not sure on quantity, but Ive read not too much or can cause cracks)

leave to set 40 ish mins depending on weather/heat/wind etc.
Finish off with sponge float.

make a cuppa

cheers

Sound about right?
Thanks again guys.
 
I can't find any info on waterproofer quantity..just a cap of per mix?
Going to use a cement mixer from hire shop.
Also I just read that the lime should be soaked in water for 24 hours?.
The more I look into this the more there is to know.
I've got to do this job for my dad as the house really needs it, and he just can't afford to get in a tradesman, unless the lottery comes in.

If there's any tips you can give please do, as I don't mind if it takes me 5 days, as long as it doesn't fall off he'll be happy. And the masonary paint should tidy it up.
 
Thanks for the link.

They don't mention lime...is it ok to put lime in with the waterproofer?
Well, I spose I'll find out, I'll put 3:1:1 scratch with a splash of watewrproofer.
4:1:1 +waterproofer final coat.
And have fingers crossed and hope for the best.


Cheers for all your help guys!
 
Burkey this is not in any way a difference of opinion...quite simply you are wrong and after 25 years plastering ...........in Ireland, as well as England, Germany, America, and France, I KNOW what I am talking about. It is so bloody obvious it is a wonder you have not worked it out for yourself, a waterproofing agent in the floating coat renders (no pun intended).........the finished coat, yep! you got it ..waterproof. I could elaborate further but I do believe it would be lost on a man who after 22 years of specialist work still spells it with a z........... Its specialise.
I look foward to reading some more of your gems!
 
Treefella, wet down the prepared walls and 4:1 scratch coat sand & cement.
Finish coat 5:1 with a good shovel of hydrated lime (comes in a bag from merchants) per belle mixer (full barrow) Add the waterproofer to the water in the mixer one good splash from the container will surfice, mix up initially stiffish and allow the waterproofer to blend into the mix for two or three minutes to give a nice consistency.
 
Cheers legs-akimbo, I'm going to use your advice with the mix, and also the beads around winows and door, using just a batten to render up to for my edges.
Thanks for your time and knowledge, very much appreciated.
 
Treefella you can get the plastic beads from screwfix, much cheaper and easier to hang than stainless or galvanised.........two coat half inch ones are best.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top