Damp-proofing a wall - seal it from the inside??

[nelianne]

Hi,

We have a damp problem on the living room wall (this is also the gable wall), mainly showing through salts coming through the plaster and the paint bubbling off.

This has been attributed to cavity wall insulation; i.e. damp penetrating through the insulation on the wall. During the summer the outside wall was re-pointed and then sealed with a breathable compound. We also sealed the edges of the window, so the outside should be OK.

In the mean time, we also took the plaster off the inside of the living room wall (we were told it was polluted by the salts coming through). The wall is now ready to be re-plastered.

We have been told that (for added protection) we can use a liquid damp-proof membrane on the inside wall, before the base coat plaster goes on.

My question is; will this pose a problem in any way (sealing the wall on the inside)? Is this usually done, or is it more likely to cause additional problems?

Many thanks for any advice!

 

[wessex101]

Couple of quick points.

I cannot see how the plaster had hygroscopic salt contamination from penetrating damp, it is usually associated from rising damp from ground water or a bridged DPC.

Applying a liquid damp proof coating internally rarely works. It makes the bonding/scratch coat very difficult to stick to the wall even with sand mixed in and usually blows eventually due to the hydrostatic pressure or just pushes the damp higher up the wall.

I would make sure that you have cured the penetrating damp and then just re-plaster as normal. Is there a fundamental problem with the cavity wall insulation? Debris in cavity and wall ties, failed/defective cavity trays, bridged DPC etc. etc.

 

[theprinceofdarkness]

you have not said what age and construction or the insulation type the building has/is. I have seen wall ties sloping DOWNWARDS so penetrating water runs along them to wet the inner skin. The outer skin was rebuilt!!.
Frank

 

[PAMTies]

Hi Nelianne,

If you like, give Paul (our dampproofing specialist) a call on *********** he will be more than happy to give free impartial advice. We get a lot of enquiries like this through the website and a lot of our customers get advised to buy products that they don't need

David

PAM Ties
www.**************

 

[freddiemercurystwin]

We get a lot of enquiries like this through the website and a lot of our customers get advised to buy products that they don't need

Yes, by David!

 

[PAMTies]

Hi Freddy. Just to reassure you and this community on a couple of points

Firstly, I would never advise anyone to buy anything. I am a humble web designer for PAM Ties and stumbled across this post and thought I would reply. I'm not qualified to advise people on dampproofing hence me mentioning Paul.

Secondly, we supply materials to builders and dampproofers. Rarely to end users. We are well respected and known for being helpful in the industry so please don't see this as an attempt to "sell our goods". we are just active in discussions on twitter, linked in and around the web. I was merely trying to be helpful. (we DO see lots and lots of people getting bad advice, hence my post)


David

 

[freddiemercurystwin]

I'm not qualified to advise people on dampproofing hence me mentioning Paul.

And neither are the vast majority of damp-proofing 'expert's who claim they are.

I was merely trying to be helpful

Whilst spamming the forum!

The many Pro's and DIYer's on here have seen so called impartial damp-proofing experts giving out crap advice for donkey's. Get used to it of feck off.

 

[PAMTies]

OK Freddy this was evidently an ill advised attempt to be helpful that has been seen to be spam.

Just to reassure you again, we train and certify dampproofers across the UK, and Paul is used by the TV show Cowboy Builders as a consultant - so not really a "crap advice" type of person. This was a genuine post.

I apologise to you and the rest of the thread. I shall take your advice and "f*ck off". We participate in a number of forums without ever trying to sell or spam. It's not what we do.


David.

 

[freddiemercurystwin]

Yet you spammed the forum with a link! Which will disappear soon.