Cost of treating walls with silicon injections

Personally I would walk away or make it a condition of sale for the seller to put it right with a guarantee, are you referring to rising damp and the injection of a chemical damp course? If all of the wall is below ground level then tanking is the proper way to treat.

Has the surveyor suggested this course of action or identified the reason for the damp? The reason I ask is that many properties across the whole area suffer from damp. It is very humid here and if the property has been empty for a while this would not have helped. In some circumstances having the property lived in, aired, a form of heating for the winter and de-humidifiers could solve much of it.

Hello,

When I was doing my extension, I wanted it done to UK Standards ie with a damp course. If you look at virtually any Spanish house the bottom 1metre is always different. Ever thought why? It's solely due to the fact that it is damp/wet and no surface treatment will stay put.

I mentioned this to the builders who replied that damp was not a problem in summer!!!

Anyway, to the point, a damp course is like rocket science to a Spanish builder. They don't even sell it here. I made mine with strips of heavy roofing felt. By the way, don't mention cavity walls, wall ties or cavity insulation they fall into the category of rocket science too.

I have no damp anywhere in my house because there is also plastic under the concrete.

Sorry gjonto I don't think you are going to have much luck. Please let me know if I'm wrong. I will not take offence.

Silicon Injection would be good as said if the walls are above ground, most of the old buildings do not have DPC and even some of the more modern ones! personally I would go for one with DPC installed!  

There is one colossal difference between UK houses and Spanish ones, that being that you have something solid to inject your silicone into. We (UK) use bricks which are solid and will accept the resin.

In Spain it could the terracotta blocks full of holes, solid concrete blocks and concrete blocks with two large cavities or just random course stone if it is an old place, all of which make it impossible to use a resin/silicone injection damp course.

I really don't think you are going to fly with this one.

This is not the UK. This is a earthquake zone which equals no damp course & that is the reason you do not see it in "this' area.

Now a crawl space below the house would be the best option - maybe ask chris317 if his company can lift your house and install this. :).

In looking for a new-build - purchase one with a void under the house; this would forever solve the rising damp problem that exists in this area.

If you are really keen on this property then the way I would deal with rising (and penetrating) damp is by tanking the interior walls. This is quite invasive though and requires the interior plaster to be removed up to 1.5 metres in height, then replaster after the product is applied . I have developed numerous old farm properties Barn conversions etc and they too were  built without damp proof courses. It is potentially a diy job, but if not that confident I would get a plasterer to do the work. Anyone can buy the required products- I use Soveriegn chemicals Heydi K11 system (UK company) and all the info re the product is on their website including videos as to how to do the work.This will also give you an idea of the costs of the product. The first place I did about 13 years ago is exposed to extreme wet weather- in Northumberland, and is perfectly dry. 

Alternatively you could just live with it and keep redecorating every couple of years !

Good luck.

Hi

Steve Symmington just done ours. Fantastic job as ours was really damp

Hi Maz51  What did he actually do?

Thanks