Dnk Posted May 25, 2015 Share Posted May 25, 2015 I had a ventilation problem in a flat i own, its an old building with no cavity in the walls. I think i have cured the ventilation but after moving a large wardrobe i've found a patch of Black mould behind it. From what i'm reading its down to moisture in the air inside and cold temps on the exterior wall thus leaving the wall inside with condensation on it and then the mould grows. I've cleaned the wall with bleach but is the only option to remove the plaster and re plaster it or is there another solution Quote Link to comment Share on other sites More sharing options...
Kev.O Posted May 25, 2015 Share Posted May 25, 2015 Dunk, isn't there special mould paint which you can use to undercoat the wall before applying the desired finished colour? Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 I don't know Kev, i'm just trawling the web now for solutions. The mould has come off the skirting board but the plaster is still discoloured, i've just given it another scrub with neat bleach and left it on there to kill any bacteria. Quote Link to comment Share on other sites More sharing options...
Kev.O Posted May 25, 2015 Share Posted May 25, 2015 What about something like this. Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 I'm not sure painting over it is the best solution, i need to 100% kill the mould first, the guaranteed solution is remove the plaster and treat the brickwork then re plaster i guess Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 Just been over it again with neat bleach and a scouring pad sponge, its definitely getting there. I shall keep attacking it with the bleach, hopefully it should be pretty much gone with a bit more elbow grease It doesn't appear to have gone into the plaster and is just stuck on top of it Quote Link to comment Share on other sites More sharing options...
David P Posted May 25, 2015 Share Posted May 25, 2015 A good soaking and scrubbing with neat bleach will get rid of it and improving the ventilation will prevent it returning. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 25, 2015 Share Posted May 25, 2015 If you are anywhere near a farmer's store get some Dairy Hypoclorite. Farmer's use it very diluted for washing down dairies. used neat it;'s a VERY strong bleach, great for what you want, and FAR stronger than the likes of Domestos. Comes in 25 litre drums, about 12 quid. If you paper the walls you can stick aluminium foil on before the paper. Sounds like the tenants are not ventilating the place, and probably drying clothes in there. Sometimes a dehumidifier is needed, then they'll whine about running costs.... Blocked chimneys, double glazing and tumble dryers etcetera mean older properties never get properly ventilated. I like enough ventilation bricks sub floor, (assuming a cavity ground floor) to lift the carpets On upper floors that becomes a problem... Damp is never a tenant's lifestyle issue, always the poor old landlord's Here's a link to some on line, but dearer than you need pay: http://www.gloves4less.co.uk/sodium-hypochlorite-25-litre-1887-p.asp?gclid=CPG6g7Pw3MUCFWbKtAodRzUA9w Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 The inside of the main window in this room was full of condensation but since fitting trickle vents thats gone now but i noticed this when i moved the warddrobe, the house hold bleach is getting there slowly but surely. The warddrobe has also been moved to an internal wall face now as well so that will help Thanks for the info guys, i'll save that link for future use, cheers Chris Quote Link to comment Share on other sites More sharing options...
Kev.O Posted May 25, 2015 Share Posted May 25, 2015 Glad to see you're getting there Dunk. Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 Glad to see you're getting there Dunk. Thanks Kev, i need to have another go at it tomorrow but its nearly all gone now, once its dried out thoroughly i'll get something like the paint you linked to and the job should be done Just got to fix the car now Quote Link to comment Share on other sites More sharing options...
Kev.O Posted May 25, 2015 Share Posted May 25, 2015 I seen it on the other halves Facebook, idiots! Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 25, 2015 Author Share Posted May 25, 2015 I seen it on the other halves Facebook, idiots! Apparently they did a whole row of cars on the same night, reminded me of when my first mkiv was keyed down both sides Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted May 25, 2015 Share Posted May 25, 2015 Dnk, I wouldn't advise just cleaning it and painting it mate. Damp can be relentless, if it's in the wall it will need chopping out and replastering. Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted May 25, 2015 Share Posted May 25, 2015 Bleach don't actually get rid of the mould. You need vinegar Otherside of the wall is it outside? or does it lead to a room? Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 26, 2015 Author Share Posted May 26, 2015 This has been caused by a high moisture content in the air inside the flat, add to that no ventilation in this room or any of the other rooms and you end up with condensation on the inside of the wall as the other side is outside so you get a temp difference. Just like you see on windows. The large wardrobe that was in this corner also added to the problem. The ventilation has been sorted and there appears that the mould is only on the surface of the painted plaster which has pretty much all come off, i shall be having another go at it today after i buy a new scouring pad as the one i hadhas died I've had a good read up on this and quite a few places recommend cleaning with bleach or white vinegar and several other things. The bleach appears to have worked from what i can see Quote Link to comment Share on other sites More sharing options...
Kev.O Posted May 26, 2015 Share Posted May 26, 2015 How did today's efforts go Dunk? Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 26, 2015 Author Share Posted May 26, 2015 How did today's efforts go Dunk? Been busy doing other things but will finish this off tomorrow i hope Quote Link to comment Share on other sites More sharing options...
ChrisH Posted May 26, 2015 Share Posted May 26, 2015 Most buildings with solid walls were built pre war when there was open fireplaces, drafty windows and were cooler with no central heating, this all helped to keep them dry. The mold is caused by the damp that forms on the inside surface of a relatively cold wall, especially if unventilated. A permanent cure would be to line the walls with insulated plasterboard - this can be bonded in place with dabs of adhesive, however, you have to remove and replace skirtings, it would add a couple of inches to the wall thickness and you have to work around any windows. Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted May 26, 2015 Share Posted May 26, 2015 You could install a PIV? Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 27, 2015 Author Share Posted May 27, 2015 I was looking at fitting a PIV last night, they look like they do the job nicely and very cheap to run The Nuaire Drimaster is around £230 and pretty easy to fit by the look of it Quote Link to comment Share on other sites More sharing options...
The Raven Posted May 27, 2015 Share Posted May 27, 2015 First question do you dry stuff on rads? Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 27, 2015 Author Share Posted May 27, 2015 One last scrub and its all gone I've wiped the wall down with neat disinfectant and will keep all the windows open to dry it out then re decorate that corner I used a red bodyshop scotch brite pad for the last stubborn bit which worked a treat, way better than the household stuff. I shall be fitting trickle vents in all the windows and also contemplating getting the Nuaire PIV to finally fix the problem which can go in the loft Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted May 27, 2015 Share Posted May 27, 2015 I was looking at fitting a PIV last night, they look like they do the job nicely and very cheap to run The Nuaire Drimaster is around £230 and pretty easy to fit by the look of it We are currently looking at one for ourselves. We had the property cavity wall insulated last year. Winter gone we suffered terribly with moisture for the first time. It would seem whilst the house is markedly better at retaining heat it has also prevented the free movement of air. Seems like these are a good idea and relatively cheap. I've read somewhere that new builds have to include some form of internal ventilation now to prevent moisture problems associated with higher energy efficency homes. Any input from any builders on this (Sorry for the thread hijack Dunk but we might both benefit from a little knowledge here). Quote Link to comment Share on other sites More sharing options...
Dnk Posted May 27, 2015 Author Share Posted May 27, 2015 I ordered one from a seller on ebay today, £225 inc free delivery, £280 if you go to Nuaire direct ! No problem mate highjack away its all part of the fix for the problem Quote Link to comment Share on other sites More sharing options...
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