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PostPosted: Fri Sep 29, 2017 7:05 pm 
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Hello,

I have the task of either painting or rendering a large block built greenhouse that's currently not looking very smart due to having internal and external walls suffering from efflorescence.

it's something I've been building voluntarily from scratch on and off over the last 3 years for a charitable organisation.
I put the final window in a couple of days ago so it's the block work next and what to do with it.

I'm not a builder or carpenter by trade so every job has been quite a learning curve...:)

I was hoping to maybe give it a couple of coats of Dulux textured masonry paint but even after trying to physically remove the efflorescence with an electric wire brush attachment today I can see the powder is now right into the block work.

If I were to physically brush as much of the efflorescence away as I can will some decent masonry paint do the trick ?

Any advise on what my options are would be more than welcome....I really want the walls to look as good as possible but am worried about the white deposits perhaps making a reappearance through any finish I decide to apply to the walls.
The inside walls are not quite as bad as the outside ones efflo wise but there's still a fair amount coming through unfortunately.

The photos were taken directly after hours of heavy rain hence the rather damp appearance of the GH...:-)


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PostPosted: Fri Sep 29, 2017 7:27 pm 
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that efflorescence will come through any paint incuding masonry wash. probly the blockes were soaking when you laid them.you can brush it off with a dry stiff scrubing brush but it will be a thankless job repeated every year .
if you sand an lime render the bloks it will penetrate until it dries out but the greenhouse might generate lots more mosture?


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PostPosted: Fri Sep 29, 2017 8:04 pm 
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wes56 wrote:
that efflorescence will come through any paint incuding masonry wash. probly the blockes were soaking when you laid them.you can brush it off with a dry stiff scrubing brush but it will be a thankless job repeated every year .
if you sand an lime render the bloks it will penetrate until it dries out but the greenhouse might generate lots more mosture?



I was hoping that the efflorescence had maybe run it's course and would become less as time went on.....the structure was started 3 years ago.

If I can seal the top of some of the pillars more effectively that should limit some of the moisture ingress I hope.

Ideally if I could use breathable masonry paint then perhaps accept I'm going to have to repaint every couple of years ?.


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