Rising Damp , Dryzone Is it anygood?

Dom29

Hi All,

We have a little bit of rising damp its been there since weve been in , its an internal wall & we also have a similar problem on an external one in the kitchen.
I had a damp specialist come round and tell me it'd cost £1200 for me to get it fixed by themselves. this includes injecting the walls and a cerment fillet around the external.

Ive been googling around... as i do.. and it doesnt seem that difficult to inject the walls myself ive looked at the Dryzone system injecting in the mortar and it goes across.

Could of questions. Is it as good as they say it is ?

has anybody tried this themselves and had good results?

The internal wall is between the living room and the kitchen . the kitchen has a concrete floor and the livingroom has floorboards. i was planning on taking up the floorboards and injecting as far down as i could get. But the concrete floor will be higher than the injection point ? how can i avoid this ? or should I just inject just behind the skirting and have the skirting cover it ?

Thanks in advance !

Mr.Generous

the stuff I've used you have to inject in the mortar the course above the damp course. It's from Permagard https://www.permagard.co.uk/damp-proofing/cream I used the Aida stuff - £71 for 10 tubes. Injected all round walls. Problem is its a plaster off job, inject then re plaster using plastering sand, cement and damp proof additive. It cost me less than £500 whole job, I hired a cement mixer and paid a speciaist damp plasterer, never done it with plastering sand, glad I did - he did a rough scratch coat which he deliberately roughed up before the finish coat. Re painted a couple of weeks later, no more damp!

ally1974

External wall might not be rising damp- check land level outside to see if higher than inside or whether there's a patio/path that goes right up to edge of building and if water runs towards or away from building. You can easily do external works such as simply lowering land level or installing a simplified French drain system so water doesn't come into your building. For the internal wall, if you use an injectable you will need to ensure that the stuff is a continuous layer through the whole depth of the wall or it's pointless. Is it definitely rising damp?

Dom29

Ill have a look thanks for the advice

Dom29

Hi, there is no water pipes which run near at all. i believe it is as this is what the damp specialist said i have a picture which i took back in june 15,

As for the damp on the external wall the drive does slope down towards the house and there is a lot of repointing needing doing but it cant hurt to inject the walls can it ? as i thought id get the pointing done just after id done this . but like you say i may need to devise some kind of draining system.

Mr.Generous

that's been plastered with gypsum plaster, if there is any damp whatsoever it will draw it. from the pic it looks like someone has attempted damp work, IE new plaster to 3ft.
The old high pressure injection into the brick was really dificult and messy, the new creams into the mortar are relatively easy. Drill holes,fill with cream. The tricky bit is the re-plastering.
It is basically tanking ie completely impervious. If you do the damp work and have to re plaster it costs very little extra to do it that way and completely eliminate damp.
If they plaster it with sand/cement/water proof additive they offer ridiculous guarantees. If you re finish with normal plaster you are likely to have some damp in the future.

Dom29

Thats very interesting you mention that as strangely enough if i remember correctly when we originally decorated it was just this wall which looked like it had been recently plastered..

If i inject the internal wall on this side below the floorboards and the concrete flooring is higher will this eliminate the object of injecting ? or should i just do it 1 brick up from the floor so the skirting hides it ?

Also when the plaster is removed how long do i need to leave it to dry out ? or do i get some kind of plasterboard to cover it ?

DRP

Dom29 wrote: »

Hi, there is no water pipes which run near at all. i believe it is as this is what the damp specialist said i have a picture which i took back in june 15,

As for the damp on the external wall the drive does slope down towards the house and there is a lot of repointing needing doing but it cant hurt to inject the walls can it ? as i thought id get the pointing done just after id done this . but like you say i may need to devise some kind of draining system.

Wow. That is such a regular pattern of damp coming through that it looks like it could be the exterior ground level. Is it concrete outside, and is the level above your dpc? Who owns it?

If it were me I'd be dealing with the outside before going to the expense and disruption of interior work. A chemical dpc would just be dealing with the symptoms, not the cause.

For the driveway, I'd be spending my money on a drain and/or lowering the levels - it is what i did in my place, after the previous owners built an expensive block driveway that blocked up all the airbricks and was above the original dpc.

Dom29

Hi thanks for the reply. The wall in question is actually a internal wall , this backs on to the kitchen which has a concrete floor which is the same level as the floor in the room pictured.

The kitchen goes along the side of the drive which does have a little bit of standing water and it does slope down toward the other external wall which is damp. its a shared drive way but im sure id be fine doing anything on my side. i.e making some kind of a channel for the water to run.
Im unsure if its above the DPC ill check in the morning. but the house was built in the 1930s and was told this dpc could be degraded and useless by now ?

phil24_7

The water will be tracking in using the concrete kitchen floor. Deal with the source of the water, not the symptom. Once you stop the water getting in, there will be no more damp!

DRP

Dom29 wrote: »

Hi thanks for the reply. The wall in question is actually a internal wall , this backs on to the kitchen which has a concrete floor which is the same level as the floor in the room pictured.

The kitchen goes along the side of the drive which does have a little bit of standing water and it does slope down toward the other external wall which is damp. its a shared drive way but im sure id be fine doing anything on my side. i.e making some kind of a channel for the water to run.
Im unsure if its above the DPC ill check in the morning. but the house was built in the 1930s and was told this dpc could be degraded and useless by now ?

could be - but unlikely in my experience!