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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Building Questions >> Damp proof walls in mid terrace https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1381583193 Message started by quintain1 on Oct 12^th, 2013, 2:06pm

Title: Damp proof walls in mid terrace
Post by quintain1 on Oct 12^th, 2013, 2:06pm

Hi
Can any one advise on damp proofing walls for a small 1890s (ish) mid terrace home with adjoining properties at (very close) to a level run. Property is 3 storey including attic room

The front and rear walls are rubble filled sandstone inner & outer with a general thickness of 18".
The party walls at this moment are unknown but I consider either 12" or so sandstone or brick built.

It is the party walls my question is mainly directed at, obviously I do not want to cause any damage to other properties; however any and all advice including front, rear & party walls treatment will be welcome.

My own thoughts at this time is to ignore any injection of damp proofing liquid and simply remove existing wall plaster on all ground floor walls to about waist height and replace it with a sand cement with waterproofing agent mix. I would use rotproof skirting and carefully examine door frames and lower part of timber staircase.

Thank you in anticipation of any answers/advice.

P.S. I will ask a question on building an attic room dormer window in a new post.

Title: Re: Damp proof walls in mid terrace
Post by woodsmith on Oct 29^th, 2013, 7:58am

Are your walls damp or are you trying to pre-empt a problem? We have rubble filled walls and any sort of injected damp proofing is useless. I am not sure if using a damp proof additive alone would guarantee a dry wall, perhaps Wolf would know more if he sees this post.

Rather than try to seal the damp in you may be better off using a lime plaster and breathable paint. If you did want to use damp-proofed cement I would remove all the plaster from the wall, give it a thin skim of cement with a damp proof additive and then either dot and dab insulation backed plasterboard or build a stud wall set just off the existing wall. This loses a bit of the room but will make the room a whole lot warmer too and ensure a dry wall.

Title: Re: Damp proof walls in mid terrace
Post by Rodie151 on Oct 30^th, 2013, 4:42pm

Have a look at the Schrijver System Spam removed, it doesn't involve injecting liquid and it might provide a solution to the terrace situation.

Title: Re: Damp proof walls in mid terrace
Post by londonman on Oct 31^st, 2013, 9:39pm

wrote on Oct 30^th, 2013, 4:42pm:

Have a look at the Schrijver System Spam removed, it doesn't involve injecting liquid and it might provide a solution to the terrace situation.

Do not look at this system. It has a bad press and has been rebranded at least once.

Synthaprufe.....liberal coating up to about 4ft...then while still wet throw kiln dried sand (available in sealed bags from the likes of B&Q) to provide a key for replastering. Job done.