Ask a Tradesman
Restoration & Refurbishment Question
Has my repointing caused another problem?
Moved in to a 1900 victorian house about 6 months ago, brick built, exterior of the house is painted white. There's a bit of damp in the spare room and on looking outside i can see some of the mortar in the brickwork needs repointing, I've done this, scraped all the old loose out and repointed with a normal mortar mix. I've not had chance to repaint yet (because of the weather). 3 weeks down the road and the damp is worse inside and some cracks have appeared in the plaster on the wall inside opposite where i've repointed and to an adjoining internal wall. Have i caused this?
could be caused by using cement mortar which seals the walls and does not let the moisture escape rather than a lime mortar which allows the moisture to escape.
also as its an old house a lime wash should be used
in these older propertys there is not always a cavity that is why lime mortar and lime wash paint is important it allows your brickwork to breath.
solution re-point using a lime mortar
Answered 19th Jun 2011
Hmm sounds like you may have wall tie problems, the ties will be corroded and expanding in the brickwork allowing water to run along them and into the internal leaf of the house. Get a specialist out, post as a job on here for quotes, they can isolate the damage tie by removing all the mortar around it, then they install new ones which are simply a drill bit installation.
Answered 20th Jun 2011
I can not give you a definitive answer re: "Have I caused this?" Without seeing the damp walls (external and internal).
There could be other factors that are causing damp issues with the wall.
Which could be any of the following:
leaking roof from dislodged / broken tiles
Failed brickwork - Other area';s of poor pointing higher up on the external wall, which might have been overlooked.
Possibly best to make contact with a reputable & proficient builder or architectural surveyor - So that they can source where the damp problem area's are and why!?
Also it would be best to get the latter done ASAP, as more damage can be caused if damp issues are not dealt with - Due to the wall soaking in more and more weather/damp and in turn causing more damage to the render and plaster on internal wall/s.
Answered 20th Jun 2011