What technique should I use to paint outside of house - Heavy thick render

suisidevw

Hi guys, Fancy tackling a challenge this long weekend if the weather holds off.

The rear of house is a rough render.......... I was thinking a wire brush to clean in the render followed by a couple of coats of masonry paint applied by...........?!?!?

Pic below, sorry so bad, only one I could find before we moved in which shows a bit of the wall of extension.

all help/advice/hints appreciated.
Thanks
Sam

ormus

use the correct masonry paint brush. you will prob need at least two coats.
ive tried rollers, very quick but they dont seem to get enough paint on the job.

WestonDave

Whilst I wouldn't disagree with the above as the best solution, if you can get a really good first coat on with the brush, you might be able to get away with a second coat done with a long pile roller, provided you keep the roller well loaded and if the "stipple" on the render is fairly shallow. The other downside to a roller (other than inability to get right into cracks etc) is that you and everything around will get splattered with a fine spray of paint (particularly with the long pile roller you will need) so the time taken cleaning up might outweigh the time you save over using a brush.

I would seriously consider spending slightly more on a brush that is comfortable in your hand because on a long job like that, a cheap brush that makes your hand ache will make the job seem a lot harder.

suisidevw

Thanks chaps..... appreciate teh help, deep pile roller and special brush will be purchased. How long should I be expecting to do a rear of the property, ground and first floor, average size 3 bed semi........... just roughly? weekend?

swagman

Faced with a similar problem I used a power sprayer with an extending lance and it was brilliant.
I used Manders Wallcoat from Screwfix, which needed only a little thinning.
The sprayer allows you to spray at various angles to get the paint into the hollows of the render.
The downside is that you have to mask thoroughly areas you do not want to paint, plus you must avoid windy days!
Despite that extra prep time the actual paint job time is so dramatically lower that it ends up overall faster.
I had a large area to do so bought the sprayer on eBay rather than hire.

Suzy_M

Can recommend the Sandtex professional site for practical recommendations and various tips on exterior painting.

Best tip I found - when it was too late of course, was don't use a wire brush for cleaning down as any bits of wire bristles caught in rough render will eventually cause rust stains through the paint surface.

dander

when I painted a roughcast rendered wall I found a smaller brush was easier than one of those big ones. Smaller more flexible bristles went into the dips and crevices more easily.

amcluesent

I'd rent a jet washer to clean off.

TBH, I think masonry paint puts you on a treadmill of repainting as algae/staining looks all too obvious. Have you considered a cement wash?

savemoney

I painted my render house 3 years ago with dulux weathershield trade brand

I think a brush would be better myself that render looks quite rough unlike mine. I gave mine 2 coats bit it had been painted before not sure if yours has by picture if it not might need 3 and first coat watered down a little if its dulux trade

Do small areas with smaller brush also put sheets down as paint does fly. Idiot decorator did next doors house last year and paint got on my car he painted when it was windy a little

Remove any mould and patch up any areas that need doing before painting. I also used pva glue watered down on some areas decorator told me this and it used it on window sills and paint was loose I did strip loose paint off, so far 3 years on paint is still there

Plasterer

Perhaps you could spray it?

ormus

along with the neighbours car?