Pebledash advice

cliff1010 · 9 Oct 2015

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 · 9 Oct 2015

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 · 9 Oct 2015

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

cliff1010 · 9 Oct 2015

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

stevethespreader · 9 Oct 2015

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 · 9 Oct 2015

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 · 9 Oct 2015

I will. Post some pics tomorrow

Alastairreid · 9 Oct 2015

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 · 9 Oct 2015

alastairreid said:
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 · 10 Oct 2015

"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 · 12 Oct 2015

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 · 12 Oct 2015

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 · 12 Oct 2015

thanks Steve will do

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