advice please mould/fungus

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sully

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Hi Lads,
Im new to this forum im a tiler by trade plastering is out of my league.
I have had a conservatory put on at the rear of my house replacing my old one, its alot bigger than the previous on and goes the whole width of the house and attatches to an outside building we have there so it becomes part of the house, the building is suitable for living in etc and is going to be a bedroom for my daughter.
Where the inner walls have been plastered the guy has done a great job i must say, where he has plastered over the wall on the building that was used to the outside elements he has just dot and dabbed the plaster board on then plastered the board this was a week ago , i have just noticed there is mould right at the bottom, can i get rid of this or does it need ripping out and doing again ? My gut instinct is telling me it needs doing again im hoping i can treat it now as the floor is getting screeded next week.

Cheers Sully
 
does the bottom of the board go below the bottom of the door? if so he's dabbed it below the dpc, big no-no, gotta come off and thats what youre problem is, its soaking water straight out of the wall....
get someone who knows what theyre doing...
 
Thanks for the prompt reply Chris.

I have just looked at it again it does just reach below the door on the building but as i recall the ground has come up a big amount from what it was.

Whats the solution rip out start the whole wall again or just rip out abt a foot and start again ?
 
youll be alright ripping off the bottom foot or so, the boards should ideally stop an inch or two above the dpc line...

now then, this wall used to be an external wall yes? and is now covered by a conservatory...
what is to stop water soaking into the bricks above the roofline, penetrating down into the brickwork below the roofline and being drawn out into the conservatory through the plasterboard...
it does happen...
technically something called a cavity tray is supposed to be installed in the brickwork above the roofline, this forces any moisture within the brickwork back outside above the roofline through little plastic 'weep vents' installed in the vertical (perpedicular) joints..
you wont have cavity trays, or if you have ill be gobsmacked..
for this reason the best solution i can recommend would be to render the wall with a sand and cement render with a waterproofing additive before skimming it...

not trying to frighten you though, chances are it wont really become a problem, loads have been dabbed without any serious problems or even hardwalled (porous backing coat).. it all depends on the state of your brickwork above the roofline, how porous it is and whether the pointing is up to scratch, not to mention the quality of the flashing...

for now, just stanley knife a foot off the bottom, hack off the dabs and redab some more board in keeping it 2" above the dpc line... re skim it blending it back into the wall...
 
the floor screed is coming up to abt ban inch and half below the floor level in the outer building which is gonna be below the door
 
Chris,
i have to say that has worried me a bit i like things done to spec, gonna ring the company that has done this tomorrow and get them to look and repair, its cost me 20 grand so want the best, i know its 36sq meters and reasonably big for a conservatory but youd like to think they could do it right,
 
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