hi there, i'v recently had a conservatory built back in august with a dwarf brick wall on the outside and iv nocticed that the brickwork when dry from rain is turning white like a dry powdery stain i suspect this is damp obviously its still under guaruntee is this something i should be worried about ie should i call the company who built the conservatory to check it out
i must add the conservatory was built by a very well known national company
This is efforvescence, basically salts in the bricks comming to the surface. It is nothing to be worried about but can be unsightly.
You can brush or scrape it off, but it is likely to return. There are products such as sealers that you can buy to help prevent this.
Sorry, only just seen your reply. I did not get any email notification.
You need to brush / scrape as much off as possible, to return the wall to it's former state. There is no point sealing an ugly white stained wall.
Products such as Thompson's Water Seal will form a barrier to water penetration, which will in turn stop the salts leeching out. You may have to repeat this treatment after 2 or 3 years.
You should probably not do this with a new wall. I think you need to wait about 3 months, check directions on can.
You can buy this and similar products at most of the large DIY outlets - B+Q, Homebase etc.
Some types of bricks are more prone to this problem. I have seen this on many front walls around where I live, spoiling some excellent brickwork.
So this is far from an uncommon problem.
I don't believe it is worth complaining, and you may well have chosen the bricks anyway.
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