What make of damp proof paint

jinnywren

We have a condensation problem in a small bedroom with 2 outside walls.
I plan to scrub mould off ceiling over crimbo & want to paint waterproof/ dampproof paint on.
Where would one buy this & what make would I be looking for.
Thanks

roswell

before you go that far what ventilation is currently in the bathroom / are you planning on installing in the bathroom ?

mutley74

roswell wrote: »

before you go that far what ventilation is currently in the bathroom / are you planning on installing in the bathroom ?

I think OP is having damp in a bedroom.

I would suggest you look into what is the cause of the damp? such as leak from the roof coming through the internal wall, or leak around a window frame.

last time i used a damp proof paint was wickes own brand, which was cheaper than B&Q at the time (you will need to recheck prices).

jinnywren

Spoke to a builder and it's definitely a condensation problem.
Now using a dehumidifier & leaving the window open all day but ceiling still a mess.
I live in N.Ireland so don't have a Wickes Store.
What do you actually call the paint please?

AGBAGB

We have a condensation problem in a small bedroom with 2 outside walls

If condensation is the problem then damp proof paint wont help. This paint only works if it's something like penetrating damp that has been cured and you want to paint before the plaster has fully dried.

The cure, after cleaning and repainting is:
1. Reduce air moisture - don't dry cloths on rads, open a window when you have shower, vent your tumble drier etc.
2. Ventilate, open the window just a crack overnight or a good blast during the day.
3. Insulate in the loft, If the ceiling isn't the coldest part of the room, the condensation wont form there.

AGBAGB

doh... Are you really using the dehumidifier with the window open?

If so your using your electric to dry out the rest Northern Ireland.

chloe99_2

i'm also interested in this thread as we have a black mould problem in our small (3 outside walls) back bedroom.

Mmmm, yes we do dry ALL of our laundry in there AND use a steam generating iron and no we definitely DON'T open the window when it's cold out!!!!!!!!!

Having said that it is clear when I lay my hand on the wall that the black area is very much colder than the rest of the same brick wall. So I am not convinced it is condensation, but have no idea what else it could be.

Oddly, the most exposed wall sounds actually hollow, I wonder if someones solution to cold or damp in the past was to put up some batons and plasterboard?

AGBAGB

chloe99, Let me guess, you've also got double glazing?

The moist air will condense on the coldest thing in the room. In your case the cold bits of wall. In the old days the coldest thing used to be the single glazed windows.

In your case, you need to ventilate.

The damp wall could be feeling colder just because it's damp. Or because it is colder, the insulation properties of the wall might not be consistant. If has been battoned and boarded with insulation behind it, the insulation might have slipped down. If it's rockwool insulation it could be damp (due to no vapour barrier) and have lost its insulating efficiency.

If you cured this however, the damp will form in the next coldest parts.

Think about getting a tumble drier with a vent to the outside, expensive to run but effective.

For a cheap dehumidifier, just to dry out the wall, try an old fridge left running with the door open a bit and the back of it against the wall. (make sure you close the window)

chloe99_2

he he - yes we do have double glazing in there.

Could it really just be a cold patch? I was fairly sure would be structural fault like a disintegrating outside wall or yet another leak in the roof.

The cold patch is on one of the brick walls, the hollow wall is quite warm interestingly.

Ooohh - what a good idea about the fridge - we have just ordered a new one so will have an "old fridge" lying around in a few weeks time. It's a larder fridge, will that do?

AGBAGB

Larder fridge is fine, just keep an eye on it, don't run it overnight or when your out, just in case the thermal cut out on the compressor isn't working. Only leave the door open a fraction 2cm ish. And empty the water the water/ice out regularly.

There's a slim chance it could be an extenal fault but I'd say it was your internal activities that's to blame

This is a case where you need to treat the cause (drying clothes) before the syptoms.

jinnywren

AGBAGB wrote: »

doh... Are you really using the dehumidifier with the window open?

If so your using your electric to dry out the rest Northern Ireland.

I should have made clear, window left open all day & closed at nite.
Dehumidifier only put on all nite when someone sleeping in bedroom.

:rolleyes: