damp proofing with vandex/hydradry, over a black-jacked surface

Members online

brightonbuilder

New Member
Hi all, I am doing a damp-proofing job, I thought it was normal plastered walls, turns out, its insulated boards, dot and dabbed onto black-jacked brickwork.
question is, what would the best procedure be now?
I was thinking, coat with pva, then a coat of washed sand, cement, then vandex etc, would that be ok? cheers, alan
 
I would've keyed the black jack, with a bit of sharp sand when it was still sticky. Then you can try s&c over it may as well scud it beforehand then s&c. I never done it tho only guessing

Sent from my Nexus 6P using Tapatalk
 
Hi all, I am doing a damp-proofing job, I thought it was normal plastered walls, turns out, its insulated boards, dot and dabbed onto black-jacked brickwork.
question is, what would the best procedure be now?
I was thinking, coat with pva, then a coat of washed sand, cement, then vandex etc, would that be ok? cheers, alan

How did you not realise this before?? Surely you'd of tapped the walls to check when looking at the job?

Black jacks a tricky one as there's no suction.
You'd struggle to get any material manufacturer who advise going over it.

Can you not redo in insulated board again?

Whats the situation with the damp? Why are you removing it?


Sent from my iPhone using Tapatalk
 
Depends what the damp problem I suppose but if your going over black jack then EML

Sent from my E2303 using Tapatalk
 
No replies! must be a tricky one then.

Tricky ? I doubt it! Messy ? Very much indeed. Who came up with the idea to dab insulated boards onto rubbery wall , most likely external, is your man . Find him! If you can't , either what Zolco says- in case of lacking space, or Irish spread - for doing it as it should. Also, you don't say what wall is and wehere is located, which can change slightly the replys
 
Hi all, I am doing a damp-proofing job, I thought it was normal plastered walls, turns out, its insulated boards, dot and dabbed onto black-jacked brickwork.
question is, what would the best procedure be now?
I was thinking, coat with pva, then a coat of washed sand, cement, then vandex etc, would that be ok? cheers, alan
Difficult to come up with a solution for this on. Perhaps you could post some pictures, as it would be helpful.
In any event we need more info.
Why is it damp? How has it got damp? How long has t been damp?
As vfr12 says, getting anything to stick to the rubbery surface is gonna be difficult. If you have space, studding and boarding might be the easiest method.
 
While all the damp specialists are on can any of you explain to me what a dude said in another thread and never came back on to answer questions, he said surveys said he "had historical damp "? Sounded like a load of tosh to me but if that saying is correct I'll admit I am thick, thanks :endesacuerdo:
 
While all the damp specialists are on can any of you explain to me what a dude said in another thread and never came back on to answer questions, he said surveys said he "had historical damp "? Sounded like a load of tosh to me but if that saying is correct I'll admit I am thick, thanks :endesacuerdo:
How historical - 100 years old
 
Few years back the council were making us dab over black jacked walls explained why it shouldn't be done but they were having none of it also seen limelite being done over it aswell blokes going back over 2 days to trowel up the finish


Sent from my iPad using Tapatalk
 
Few years back the council were making us dab over black jacked walls explained why it shouldn't be done but they were having none of it also seen limelite being done over it aswell blokes going back over 2 days to trowel up the finish


Sent from my iPad using Tapatalk
How's limelite stuck to it? I had great difficulty putting it on pva'd walls, was slumping like hell, never in my life I struggled that much, I know pva re emulsify on contact with water and black jack won't but still

Sent from my Nexus 6P using Tapatalk
 
While all the damp specialists are on can any of you explain to me what a dude said in another thread and never came back on to answer questions, he said surveys said he "had historical damp "? Sounded like a load of tosh to me but if that saying is correct I'll admit I am thick, thanks :endesacuerdo:
That could be anything in my books, from a broken roof tile to a flooded river taking the front door out and leaving the place under water.
I'm not a surveyor I'm sure @imago would have explanation for that

Sent from my Nexus 6P using Tapatalk
 
While all the damp specialists are on can any of you explain to me what a dude said in another thread and never came back on to answer questions, he said surveys said he "had historical damp "? Sounded like a load of tosh to me but if that saying is correct I'll admit I am thick, thanks :endesacuerdo:
"Historic damp" is surveyor speak for, wet wall, don't know how long it's been wet. Doesn't seem to matter how old the building is.
 
While all the damp specialists are on can any of you explain to me what a dude said in another thread and never came back on to answer questions, he said surveys said he "had historical damp "? Sounded like a load of tosh to me but if that saying is correct I'll admit I am thick, thanks :endesacuerdo:
Historical damp is anything pre today..
Might not be problem now..but it has been in the past... I can fix it for xxx amount££.
And ££ for the insurance backed guarantee (y)
 
Top