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Damp Proofing Questions

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1,451 Damp Proofing questions

Fixing insulated plasterboard to a (formerly) damp wall?

Hi there

We have an outbuilding (3.5 external walls) which we're trying to turn into an office. It's about 150 years old, solid walls and when we moved in there was major damp. We have got rid of all the sources of penetrating damp (overflowing waterbutt, blocked drain, attached brick wall with no DPC). Then we realised the building itself had no DPC after spotting some damp rising up in the corner so we did DryZone injections. 2 months on the problem seems to be gone. We did notice some condensation on the walls the other day, but put it down to the fact that the weather very suddenly heated up (over 10 degrees increase overnight!) and that was not a problem the next time we went into the room. So hopefully we've got rid of the major damp sources but we're still a bit concerned about penetrating damp just because the room is very to the elements with empty land on one side of it that the wind and rain howls accross.

Anyway, now we want to plaster, and, because it's a solid-wall construction with no insulation, we want to plaster using Celotex insulated plasterboard (has a VPC integrated). However, we've seen really conflicting suggestions about how to fix this plasterboard to the seems we can either:
a) Dot and dab - risks damp coming through the adhesive but quicker and easier, some people say definitely never D&D, others say it's fine. Our plasterer suggested D&D nad he seems good although we're going to do this ourselves.
b) dot and dab using very expensive waterproof dryzone adhesive - will cost more and have read some very mixed reviews - some say it's great (lots of room for air to circulate as you don't form a solid barrier with it), others say it's not (you end up with bouncy walls!).
c) batten with wood battens - but a risk of interstitial condensation which could also rot the wood as well as causing plasterboard problems
d) batten with metal battens - still the condensation risk. And expensvie/more complicated.

Does anyone have any advice about how best to fix our plasterboard to the wall?

Thanks so much...!

help with damp below doors

Having problems with water coming in below my front and back door and also at the bottom of a wall at the corner of an extension, no idea if it's damp or condensation which is the worrying part, the water seems to be coming off a small strip of cement which the doors have been rested on. The extension seems to be damp along the lower wall in the outer corner closer to the actual house it doesn't seem to be a problem. It doesn't happen all the time and isn't always damp I'm at my wits end does anyone have any idea what the problem could be?

Have I got damp or is it lack of ventilation?

I've recently bought my late fathers old stone under dwelling property.
After removing all the furniture behind the sofa that was pushed up against the wall the wallpaper was all mouldy and coming away from the wall. The same applies to behind a large sideboard that was also tight up against a different wall. Also they is two large circle mould patches high up (2meter) on another earth retaining wall. All this is in a ground floor room that looks to have been recently (within 5years) skimmed in standard gypsum multifinish plaster.
I'm wondering if the plaster should of been a "breathable" type perhaps"?
Also double glazing windows were fitted throughout 5years ago but they is no mould issues upstairs, also no plastering has been recently done upstairs.
I can't find any air bricks anywhere and they is no vents on these PVC windows.
If Anyone can give me any info/advice I'd massively appreciate it.
Thanks in advance.

Exterior wall, damp problems on 1st Floor

We have a damp problem in two bedrooms on a house that had insulation drilled and injected about 10 years ago. When the insulation was done there was a part of the wall that they were unable to reach as it was too close to the house next door, so they were unable to drill and inject the insulation. This is the wall we are experiencing damp problems with now and are finding that the damp is present on the walls in the bedrooms upstairs.

Thanks in advance for any advice.

Hairline crack in external concrete render

Mid terrace house built early last century is concrete rendered. Small damp patch at top of wall above front door. The cause of this appears to be a very thin hairline crack in the external concrete render. After very wet weather, the damp appears to be penetrating via this crack through to the inside wall. Apart from this the render appears to be sound. Would painting with weather shield solve the problem, many be an injection of silicone into the crack?

Wet floors in damp property

My newly acquired (over 100 years old) property has damp walls; during several visits the floors have always been dry. However this weekend when I opened all the windows to air the house the floors downstairs without carpets were wet (it was not raining).. I kept drying them but to no avail, they remained wet in 3 rooms. There were no obvious leaks.. What could it be? Thanks

Damp and mould ongoing problems

Hi my mother has a property in an ex council stair and we have had numerous Water ingress problems over the years and still have despite renovating entire flat. Now we have dampness showing again so do I need a damp survey or a builder who can identify what and where the problem lies.

High damp readings - survey report

I'm in the process of buying a house (mid terraced, built 1890s) and the home buyers report has indicated high damp readings on the front of the building. I'm already having the roof re-covered and the chimney re-pointed and the house is going to have external wall insulation completed in the next month.

Should I get someone in to investigate the damp/recommend work or will the roof/insulation sort it? I don't want any nasty surprises but I don't want to get people in if it isn't needed either.

Mould on external walls of first floor flat

"I am moving into a new flat (for me) but built in around 1985. It is a first floor flat but on the walls in bedroom 1 and 2 is mould at floor level. It only appears on the external walls. Does this mean bad ventilation and is there an easy way of getting rid of it successfully. Is it treatable without putting air bricks through external wall which I dont think the Management Company would be too keen about."

Do I need to have an extractor installed?

Despite opening the window when showering my tenant is starting to see black mould appearing on the bathroom wall. What do i need to do to stop this happening?

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