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Cement mortar causing problems
A problem that we are coming across more and more frequently is deteriorating or spalling to the face of bricks. We commonly find this to be to the softer red brick, often found on Georgian and Victorian properties, and predominately pre-First World War properties. The deterioration of the brickwork can look terrible and unfortunately the problem has often compounded by the brickwork that has spalled or deteriorated being repaired with a cement mortar. This then gives, what we can only describe as, a spotted dog look to the property, with the red bricks having lots of cement repairs to the brick.
Lime mortar to cement mortar, the revolution
Cement mortar was introduced in the late 1940's (we believe it was 1949). This mortar has completely different properties to lime mortar, being much larger and more brittle. Whilst it works well on modern construction it doesn't work well on older properties, which are meant to breathe.
We always say that a modern property works more like a cagoul, i.e. as a raincoat on the outside, whereas an older property works much more like goretex, which breathes.
What is going wrong? Why are the bricks deteriorating?
Originally, the bricks would have been built in a lime mortar, usually in what is known as Flemish brick bond or garden wall bond. When it rains the rain gets partly soaked in by the wall and the lime mortar. Then it dissipates and is released from the brickwork and lime mortar. Over the years this can, in some cases, lead to a weathering or wearing of the mortar, which can then give ledges for the rainwater to sit on and cause dampness to come through into the property.
Repairs to lime mortar pointing
Unfortunately, the repointing that has taken place in many lime mortar walls, and in fact we would go as far as to say the majority of what we see, are in a cement mortar, rather than the original lime mortar. This means that the cement mortar, due to its different constituencies, acts as a plug and stops any rainwater or dampness coming out of the wall. This then leads to the dampness coming out on the surface of the brick, which in turn causes it to spall or deteriorate, as can be seen in the adjoining photo.
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You may be interested in our other articles about issues with walls including cracking to walls:
Please see our section on:
If you truly do want an independent expert opinion from a surveyor with regard to structural surveys, building surveys, structural reports, engineers reports, specific defects report, dilapidations, home buyers reports or any other property matters please contact 0800 298 5424 for a surveyor to give you a call back.
If you have a commercial property, be it leasehold or freehold, then you may wish to look at our Dilapidations Website at www.DilapsHelp.com and for Disputes go to our Disputes Help site www.DisputesHelp.com .
We hope you found the article of use and if you have any experiences that you feel should be added to this article that would benefit others, or you feel that some of the information that we have put is wrong then please do not hesitate to contact us (we are only human).
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