Pebledash advice

[cliff1010]

Hi I am about to start pebble dashing or at least the scratch coat to the annexe I have converted. I understand the scratch coat should be a 4:1 mix

Question 1 is builders sand ok or do I need something else.

Question 2 part of the building is new block work some is brick and some old render that seems ok, do I need different mixes or to do things different to these areas.

Question 3 Do I do the scratch coat and then wait how long
before the top coat and pebble dash
I don't know if I would get this all done in one weekend. is it ok to leave it over this time ?
what are the pitfalls of leaving it over a week.

Question 4 the top coat I understand this needs to be weaker 5:1 is that the same when adding stones ?

Question 5 as building control are insisting on pebble dashing do I need to do anything special to the top coat before adding the stones.

I appreciate any advice,

Cliff

 

[ree]

Your best bet is not to do any rendering or anything else
until you've read the masses of info. in the plastering forum about similar projects.

"seems ok" is a potentially expensive bunch of problems.

BCO's dont concern themselves with finish applications - they enforce Regs.

 

[stevethespreader]

Are you saying you are being told what you must have on your wall? Its the first I've heard someone say this

 

[cliff1010]

yes Building control said it must match the house even down to the size of stones

 

[stevethespreader]

Well I've just had a little google so you must live in s listed building or you live in a national park or similar? Post some pics up of your project so people can see and advise

 

[cliff1010]

Hi no it's not listed or a national park, but building control are really fussy. I would love it if I didn't have to pebble dash and could get away with just render.

 

[cliff1010]

I will. Post some pics tomorrow

 

[Alastairreid]

Your quantities are fine.

You will need a waterproofer through the scratchcoat.

Ditto plasticiser through the dashing coat.

You can coat and hit it the next day.

@Steve. planning quite often insist on Roof covering, decorative finishes, windows etc to tie in with existing as a prerequisite of a succesfull application.

Are you casting this yourself cliff? its not as easy as it looks if you havent done it before..

 

[stevethespreader]

Your quantities are fine.

You will need a waterproofer through the scratchcoat.

Ditto plasticiser through the dashing coat.

You can coat and hit it the next day.

@Steve. planning quite often insist on Roof covering, decorative finishes, windows etc to tie in with existing as a prerequisite of a succesfull application.

Are you casting this yourself cliff? its not as easy as it looks if you havent done it before..

I knew about windows and stuff like that but its the first time I've heard someone say it about render on a normal building

 

[ree]

"planning"? Where did that come from? The OP has three times mentioned BCO but never mentioned planning, he's also confirmed that its not "listed or a national park". So how come planning has suddenly popped up?

 

[cliff1010]

HI thanks for all the advice, I have done this before but on a far smaller scale a conservatory that needed to match the house. On the planning side sorry to confuse things but yes it came from them to start with I had to supply samples of roof slate window spec etc even a window I got on Ebay an arched window
needed consent before I could buy it. The pebble dashing was always specified even though I said I didn't like that finish, it was stated it must match the main house as an annexe and also be painted the same colour or I would not get it passed. I needed to supply a mock up on the pebble dashing painted as well. This was refused the first time and I had to acquire smaller stones even though the ones on the house are larger.

I see from the advice above scratch and hit dash next day, if I only do one side/ wall at a time and finish can I expect any problems with matching in where the wall join at the corners ?

Thanks again I always appreciate the advice I get on this forum
Cliff

 

[stevethespreader]

Cliff follow Al's advice but I personally would not use builders sand its not washed and has impurities in it including a high silt content

 

[cliff1010]

thanks Steve will do