Damp proofing cost

LouM69

Hello I would really appreciate some advice re.damp proofing. Have some damp on section of wall in front room and there is patch of mould, cold wall in the corner. I have had a variety of quotes for different options but want an idea of costs to hack off render, inject dpc and re-plaster with thermaline to create insulation for the cold corner but covering the whole wall. The area is 3.23 metres by 2.54 metres and there is a window in the middle (170 by 132cm). A ball part figure would be great, am in the south east.
Don’t need advice about particular damp proofing options as have looked into this.
Thanks in advance

LouM69

Sorry-hack off plaster not render. This is interior job.
Again thanks in advance

Doozergirl

You don't need to inject the wall so no price is reasonable.

You find the cause of it, you stop it from happening.

It will not be a 'failed damp proof course' which is what these people always say.

I haven't injected in over a decade and we've never had a call back about damp. Because we've properly investigated and stopped the source.

If it is only mould, then the solution probably just involves insulation and checking how the room is ventilated.

LouM69

Thanks for responding. This damp proofing is so complicated. Had quotes ranging from £800-£2600 giving different recommendations. What would be the cost for the work you suggested? Think the wall definitely needs to be insulated in the corner and will obviously do the whole area and then re-plaster. There are two ventilation panels. Just don’t want to throw money at the problem and not solve it.
Thanks for your time

Doozergirl

What did they say the actual problem was caused by?

LouM69

Two different opinions. Failed damp course and the other poor insulation due to the corner of building being exterior due to recessed door. There does not seem other possibility. Was more convinced by case for poor insulation so that is why wanted to know what price would be to re-do plaster and insulate for this area. They want to do dpc course too though. Your advice is much appreciated.

FreeBear

LouM69 wrote: »

Two different opinions. Failed damp course and the other poor insulation due to the corner of building being exterior due to recessed door. There does not seem other possibility.

A DPC does not "fail". Depending on the age of the property, it will be a heavy duty plastic (from around 1970s onwards), bitumastic of one sort or another (from around the turn of the century), or slate, perhaps even heavy duty engineering bricks.

Diagnosing a "failed DPC" is just an expensive excuse to inject a bunch of dubious chemicals without looking for the real source of the problem - More often than not, the solution is as simple as reducing the soil level around the outside of the property and fixing any leaking gutters or downpipes.

Doozergirl

FreeBear wrote: »

A DPC does not "fail". Depending on the age of the property, it will be a heavy duty plastic (from around 1970s onwards), bitumastic of one sort or another (from around the turn of the century), or slate, perhaps even heavy duty engineering bricks.

Diagnosing a "failed DPC" is just an expensive excuse to inject a bunch of dubious chemicals without looking for the real source of the problem - More often than not, the solution is as simple as reducing the soil level around the outside of the property and fixing any leaking gutters or downpipes.

I totally agree.

I'd like to see the inside/outside of the house where the problem areas are if you want to put some photos up.

Internal insulation is an option if you have black mould. It's not cheap to buy but you'll feel the difference in a room.

LouM69

Thanks for the replies. Really helpful. Is the inside insulation and hacking of plaster, re-plastering a big job? How much should i be paying for this. Just great to get some good advice.

FreeBear

LouM69 wrote: »

poor insulation due to the corner of building being exterior due to recessed door.

One possible problem springs to mind (depending on the age of the property). If you have a cavity wall, and the cavity around the door is plugged by brick, a cold spot will form in this area and also give moisture from outside to track in. If this is the case, then curing the problem is not a simple fix.

Doozergirl

LouM69 wrote: »

Thanks for the replies. Really helpful. Is the inside insulation and hacking of plaster, re-plastering a big job? How much should i be paying for this. Just great to get some good advice.

You don't necessarily need to hack off the plaster to apply insulation.

It's not a big job. Just depends on what knocks on - the amount of plumbing electrics and woodwork on that wall that would need to be altered. Otherwise it's a couple of days work and the cost of the insulation boards (or insulation and boards).