Damp spreading

[mark121]

Hello everyone,

Hoping you can spread some light on my problems ? just had a wall re plastered the damp has come back through and spread like wild fire.even onto walls that were never damp.three days after the damp appeared its starting to shrink.....i was told by someone that the plaster may all have to come off back to brickwork !!

its a grade 2 listed cottage ive owned for 20 years and its a mystery.The wall where the problem started always seems to blow the plaster out in certain areas after some time ,what would be the best course of action so i dont keep getting hassle from the same area of damp.And in another room my friend told me to put one coat damp seal on a 4 x 2 damp patch and the damp is spreading should i take the plaster off ? do i need vents fitting ...I would really appreciate any help or advice you can give me ....also should the plaster have been a lime plaster to let the walls breath ?

The writing below is from a google search not my writing....

The solution is to remove render and let the walls dry out. If brickwork is damaged and needs repair or replacement, it should be done with lime mortar. If it is proposed to re-render, you must always uselime render, which can breathe freely, and allows trapped moisture to escape.

 

[flynnyman]

Put some pics up of both sides of the walls

 

[Marshy]

I bet they used a gypsum based product too

 

[flynnyman]

I bet they used a gypsum based product too

Guaranteed (pun intended)

 

[mark121]

 

[mark121]

The whole wall had been plastered about 10 years ago and where the large damp spot is on the right it had all blown away as the left side.I took it off and the guy put plaster on all over but half way up the wall only.you can see the RAD on the right well there is a stiarcase that goes up into the lounge and the damp has spread under it and along a wall that has never had damp before ! I would say about 4/5 feet along .I have spots like this in the lounge although not as bad but are getting bigger ...Appreciate any help i can get Thankyou.And it has also gone left of the picture towards the kitchen as well ....A bloody nightmare !!!

 

[flynnyman]

What has he plastered it with?

 

[mark121]

normal plaster i guess ?? im not a builder

 

[flynnyman]

normal plaster i guess ?? im not a builder

Make a little hole where the damp area is, take a pic and we will tell you

 

[flynnyman]

Make the hole between the damp and dry bit to see the difference in backing coats.

 

[mark121]

I asked and was told normal plaster was used

 

[Marshy]

I asked and was told normal plaster was used

That's the problem then mate I'm afraid. Will have to be knocked off and redone

 

[flynnyman]

I asked and was told normal plaster was used

Make a hole and show us the two backing coats sounds like he's used the wrong gear.

 

[mark121]

That's the problem then mate I'm afraid. Will have to be knocked off and redone

Hello

 

[Marshy]

Hello

 

[mark121]

So if the wrong material has been used ? what should have been used and how do i rectify it.....do i have to take the plaster off where all the damp has spread ? grrrrrrrr

 

[mark121]

This is a ------ nightmare grrrrrrrrrrrrrrrrrrrr

 

[Marshy]

This is a ------ nightmare grrrrrrrrrrrrrrrrrrrr

You have confirmed "normal plaster" was used so I'm guessing it's gypsum based as I posted earlier. Go on Safeguard website and look at the Dryzone products. Depending where you live in the country? Get one of their reps out who will explain what you need to do in order not to have this problem occurring again. I hope this helps as I can tell you are (rightly so) pissed off

 

[flynnyman]

This is a ------ nightmare grrrrrrrrrrrrrrrrrrrr

For the last and final time hack a bit off if you want the problem confirmed its that simple, you can use the same reasoning @Danny uses and try and wish it away but it won't work

 

[mark121]

 

[mark121]

hope this picture tells what you need ....once again thanks for all your info !

 

[vfr12]

It's confirmed! You are not in the dryzone!

 

[flynnyman]

They have used the wrong backing coat it's a gypsum based which will hold moisture, they should of used a sand and cement with a waterproofer.

 

[mark121]

so have much do i hack off the lot or just above where the damp is say 4/5 feet high .....does the sakirting all have to come off as well ???

 

[flynnyman]

so have much do i hack off the lot or just above where the damp is say 4/5 feet high .....does the sakirting all have to come off as well ???

Did they float the whole wall?

 

[mark121]

no only half way up ,its gone on plaster that was there before

 

[mark121]

 

[mark121]

Theres a picture of a bit of wall....ive taken the new plaster off and you can see the old plaster there and sand and cement underneath ? and where its really dark i can feel a flint ...would you take all the plaster off back to the sand and cement

 

[mark121]

 

[mark121]

shall i take it all off as far as the damps spreads which is now three walls ,,,and shall i take it back to the grey area which i presume is sand and cement

 

[mark121]

 

[mark121]

took plaster off ....it is so wet

 

[mark121]

 

[mark121]

new plaster old plaster sand and cement ? and bare original wall and to the right of the plug you can see the damp patch

 

[Marshy]

Have they plastered to the floor (behind the skirting) il bet they have? I do feel for you pal as you paid for a job to be done properly and you get this shite