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PostPosted: Thu Jan 25, 2018 4:39 pm 
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Hi all, newbie here.

I've recently noticed cracks in the cement of the bricks nearest the roof. It has happened on both the front and back of the house. No bricks have broken but to me it looks like they have come forward by around 1-2mm.
I'm no builder but to me it looks like the roof truss' have expanded or it could be to do with the windows.

The house is around 20 years old and my small estate has about 20 houses of similar build. I have checked all the houses in my street but none have the issue.

I have managed to take some photos by hanging out the window so excuse the odd angles and my Christmas lights.

Any advise would be great, What could be the cause? What should I do next? Is this normal? Should I inform my insurance? Surveyor?

Thanks

Dan


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PostPosted: Thu Jan 25, 2018 5:15 pm 
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While you will be concerned, these expansion cracks at roof level are nothing to worry about and although involves working at height, are relatively easy to remedy. The cause is the heavy duty Galvanized Steel Lintels over the windows and normal expansion & contraction. As there are only a couple of courses of brick above the Lintels, expansion has caused slight lift in both bed & perp joints as the total weight and support of the roof is carried on a wall-plate bedded on the internal leaf of the cavity wall.
The remedy is to carefully remove existing pointing using a plugging chisel & lump hammer to an approx depth of 20 to 25mm.
Then repoint with a Building sand/cement mortar mixed at 4:1

Davyp1



For this message the author davyp1 has received gratitude : Cuttty
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PostPosted: Fri Jan 26, 2018 8:20 am 
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Great news, Thanks Davy, I was really concerned.

I will get it on my to do list. I have a mortar raking tool which fits on my SDS drill, would this be ok to use or would a more gentle approach be needed. Not sure why I have one of these tools as I have never used it.

Thanks again.


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PostPosted: Fri Jan 26, 2018 10:22 am 
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Yes, the mortar raking tool should work fine. Don't go too deep and take care where the ends of the lintels are present in the bed joint.

Davyp1


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