Damp proofing

aardvaak

I live in a 17th Century house which obviously has no damp course as single cavity.


As part of major renovations I was considering having the damp proofing injected into the walls by removing the plaster and render.


Does this actually work? or just an expensive gimmick,


In the past a previous owner has put up dry lining which does not work.

the_lunatic_is_in_my_head

Stone building? If so what type of plaster is on the walls?

What issues are you having with damp?

bengalknights

If its not a listed building repointing the original wall then a solid wall insulation usually helps, however would need the chemical injection at base.

stuart45

Chemical injection isn't the way to go on a 17th century building. Using the correct type of lime for external pointing and lime plaster for the interior is better.
Read this article today in Professional Builder. May just advertising rubbish though.
https://www.diynot.com/diy/media/dsc00035.103203/full

aardvaak

the_lunatic_is_in_my_head wrote: »

Stone building? If so what type of plaster is on the walls?

What issues are you having with damp?

The walls are brick the inside is standard plaster outside is concrete render, issues are rising damp showing as extensive mould and crumbling plaster

aardvaak

bengalknights wrote: »

If its not a listed building repointing the original wall then a solid wall insulation usually helps, however would need the chemical injection at base.

No it is not listed


But does "chemical injection" work or just a gimmick?

stuart45

Cement render often causes damp issues on old houses.

Doozergirl

Chemical injection is a gimmick. If the source of the damp isn't addressed, the injection does nothing. The waterproof render hides the damp until it shows itself above the 1 metre line at some point down the line.

What's around the outside of your house? The single course is an issue as far as condensation goes, so you do need insulation, but if there is a rising damp, then there's something else getting in.

Pictures inside and out would really help.

Pictures will help.

konark

A 17th century house that's not listed?

FreeBear

Doozergirl wrote: »

Chemical injection is a gimmick. If the source of the damp isn't addressed, the injection does nothing. The waterproof render hides the damp until it shows itself above the 1 metre line at some point down the line.

If one stops to think about it, the reason these injected treatments don't work is simple. You inject a chemical in to a wall that needs to dry out before it can work. But before it has time to dry, a layer of waterproof cement is slapped on both sides of the wall trapping the moisture inside. The base of the wall is constantly damp from being in contact with the soil, so what water does evaporate from above the injected chemicals is quickly replaced.
In addition to the above, the distance between the holes that are used to inject these chemicals precludes the chance of a continuous "DPC". These chemicals just can not penetrate sideways through an average brick far enough to have any effect.

aardvaak

konark wrote: »

A 17th century house that's not listed?

Yes I am very lucky - I always say it is listing not listed