What is happening to this bit of plastering.

[MikeSharp01]

Our son had a chunk of the chimney breast replastered and it seems to be effervescent. It feels dry but I don't have my damp meter with me. Any thoughts - can it be cured or does he need to get it redone? I understand the wall beneath has been damp proof injected. 

[Gus Potter]

5 minutes ago, MikeSharp01 said:

Our son had a chunk of the chimney breast replastered and it seems to be effervescent.

Hi Mike.

 

Hard to tell without some wider context. 

 

Some panoramic photos required, also external ones so we can see the ground levels. It may be something as simple as the plasterer has really soaked the wall first and that has "reactivated" the latent salts in the wall?

[Roger440]

17 minutes ago, MikeSharp01 said:

Our son had a chunk of the chimney breast replastered and it seems to be effervescent. It feels dry but I don't have my damp meter with me. Any thoughts - can it be cured or does he need to get it redone? I understand the wall beneath has been damp proof injected. 

 

Im guessing old house, solid wall no DPC?

 

Dont like to deliver bad news but damp proof injection is snake oil. It doesnt work and never will.

 

Im guessing this wall was damp originally?

 

[MikeSharp01]

16 minutes ago, Roger440 said:

Guessing this wall was damp originally

Yes defo was but has had breather hole cover to be fitted. Here is a bigger image the floor in here is well above outer ground level and the wall is the party with next door. 

[Roger440]

7 minutes ago, MikeSharp01 said:

Yes defo was but has had breather hole cover to be fitted. Here is a bigger image the floor in here is well above outer ground level and the wall is the party with next door. 

 

Ok, but still no DPC?

 

Im not there, but i bet that wall is wet internally.. Now its trapped under the gypsum. 

 

Drill a hole into the masonary above the skirting board. I bet what comes out isnt a nice dry dust.

[MikeSharp01]

12 minutes ago, Roger440 said:

Drill a hole into the masonary above the skirting board. I bet what comes out isnt a nice dry dust.

I will get him to drill such a hole and find out. We know the wall was wet but did the remedials in November last year. 

[Roger440]

18 minutes ago, MikeSharp01 said:

I will get him to drill such a hole and find out. We know the wall was wet but did the remedials in November last year. 

 

Would be good to know. Please report back.

 

Sadly, it sounds like the remedials involved chemical injection to prevent damp. Which it wont.