My building has some deteriorating sandstone. It's about 100 years old.
As far as I can tell, there is just one area that is causing a problem.
Can anyone suggest the best / simplest way to tidy it up?
Pic below:
tell from that angle so would need another pic taken from outside.
issues. Theres a specialist company that makes custom fillers to match any stone type, but I dont remember the name. One of my notes says Rose of Jericho, but I dont know if thats the one or just a general purpose filler they do. Best ask on periodpropertyuk forum, they should know.
Replacing the block with matching stone is the other option of course, more reliable but rather more work.
NT
structural issues which you have not explained or are hidden.
Your best bet is to contact a stonemason who will cut and fit new stone(s) to match the original.
That looks like a significant sized lump is about to detach!
There also looks to be some sort of coating (masonry paint?) over the sandstone. That can trap moisture and lead to cracking through freeze/ thaw cycles.
If you can clean up the area, to get back to good solid (and bare) masonry - consider a waterproof coating like Liquid Plastics K501 (a silane/siloxane based treatment) - you won't find thee in the diy stores - I ordered direct from liquid plastics.
Thanks for the replies. It is one isolated area and I don't think there are any structural issues at all. The lump that is flaking is not as big as it looks in the pictures.
I appreciate the suggestions.
Don't try to patch it up with ordinary sand and cement because it doesn't stick
In that case use a resin type filler but drill some holes in the affected area,fit rawl plugs and screw in some brass screws to act as an anchorage for the filler.
Would these resins be available in hardware shops or building suppliers?
Actually, having looked at it again, what I thought was flaking of the stone does appear to be some sort of coating - perhaps applied when the windows were put in?
and peeling render. It's probably been blown by frost - if water freezes behind the render, you can imagine the results.
You probably ought to start by examining what's under it - I'd carefully remove some of the clearly loose flakes and have a look.
You probably need to strip off the blown areas, allow it to dry out, make good any damaged brick or stone under the render, and finally re- render.
This advice is worth at least what you paid for it...
Thanks. your cheque is in the post. :)
Tenements . Years ago when grants were available to sandblast them they had some sections repaired by applying a suitably coloured "stuff" and now you see it peeling off and that in the picture is exactly what it looks like. The word "Spalling" comes to mind for some reason .
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