Anyone know how this was achieved?

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Dan Hopgood

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I'm having a new extension built at the back of my house. The planners require me to match the existing texture of the walls as it's in a conservation area. The original finish looks like this:

https://drive.google.com/file/d/0BySMW7YA0TAgUHJjM1YtdnVtV1k/view?usp=sharing

House is 1929 Collins house in Southampton.

I thought it was roughcast - but I've taken some render off the wall and there's no large aggregate in the mix. It was put on very thin - 3 or 4mm at most, direct onto clinker blocks in what looks like a single layer. It's a cementitious material.

My builder and I are both struggling for ideas on how this was done. Anybody got any ideas please?
 
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Yep, it does look like that - and that's what I thought it was until recently. It's only had three applications of paint - it was unpainted until the 1980's (I have photo's) , was repainted in 2002 and again two years ago. The paint layer is really thin.
 
It looks like they couldnt be arsed doing a proper finish of any description so i guess theres a pub very close by??
 
I would dash it with 6mm stone then when it's dry put a cement slurry over the top with a touch of sbr in till you get the desired finish cos trust me that is a shhhit original finish imo
 
We're going to try two trials - one as a roughcast finish, the other with madmonk's dash and cement slurry option. We're a bit concerned about durability ( and frost damage) with a thin layer of cement slurry though - even with SBR in it, although the finish is a painted one, which would help.
 
I'm having a new extension built at the back of my house. The planners require me to match the existing texture of the walls as it's in a conservation area. The original finish looks like this:

https://drive.google.com/file/d/0BySMW7YA0TAgUHJjM1YtdnVtV1k/view?usp=sharing

House is 1929 Collins house in Southampton.

I thought it was roughcast - but I've taken some render off the wall and there's no large aggregate in the mix. It was put on very thin - 3 or 4mm at most, direct onto clinker blocks in what looks like a single layer. It's a cementitious material.

My builder and I are both struggling for ideas on how this was done. Anybody got any ideas please?
I think it a stipple brush finish whith about 20 years of paint defo not rough cast lol
 
Its dragged finish applied thin over the surface of the render with a coarse grit.
Looks 5h1te dunnit i have the same on my house cant wait to knock it off
Can be done with a brush head n all.

Cant beleive conservation want to keep that rather than plain or mono
 
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There's no coarse material in the original mix. And it's only had a couple of coats of paint. Anyway, finish for new render started going on today. Going for roughcast with 2-6mm rounded aggregate. Looks pretty clumpy - I think probably due to the different aggregate sizes - roughcast is mixing up like wet concrete. I'll post a pic when done for you to comment on. That should be interesting(!)
 
New and old finishes together. New one is obviously different, but looks OK to my untrained eye.

Roughcast was as wet as we dared when applying it - would almost run off a hawk.
Render is cement/lime/sand mix with plasticiser in it. Scratch coat then thinish second smooth coat. Same mix for roughcast, but wetted down and 1 bag of horticultural grit (2-6mm) to 2 1/2 large trowels of muck. Roughcast flicked straight at wet second coat of render with a trowel.

https://drive.google.com/file/d/0BySMW7YA0TAgNXpKY04wcFpCS1k/view?usp=sharing
 
I'm having a new extension built at the back of my house. The planners require me to match the existing texture of the walls as it's in a conservation area. The original finish looks like this:

https://drive.google.com/file/d/0BySMW7YA0TAgUHJjM1YtdnVtV1k/view?usp=sharing
looks like roughcast very old work and been painted on many times over the years

House is 1929 Collins house in Southampton.

I thought it was roughcast - but I've taken some render off the wall and there's no large aggregate in the mix. It was put on very thin - 3 or 4mm at most, direct onto clinker blocks in what looks like a single layer. It's a cementitious material.

My builder and I are both struggling for ideas on how this was done. Anybody got any ideas please?
 
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