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Extensions

Green mould on mdf skirting

Anonymous user 23/02/2024 - 3.25 PM

I have recently had a new extension built. I keep getting green mould on mdf skirting. The floor was screeded months ago and the walls plastered back in April (2019). My builder re-dug around the extension and has double checked the damp course. My builder kindly replaced the mdf skirting free of charge and after a couple of weeks of no mound I painted the skirting and had the carpet laid about a month ago. The mould returned a couple of weeks ago. I’m wiping it down every couple of days with mould and mildew spray but it keeps returning. There is also a sweet smelling ‘odour’ In the room. The extension is my bedroom and I noticed today that mould has spread to the back of my bed and started on bottom of the legs of my bedside lockers. Can anyone offer any help and advice? Thank you.

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7 Answers

ULLYSES LTD

Rating: 5 out of 5
Newport, Gwent
Was the builder a member of the FMB. Who recommended him ?? Is the A damp proof membrane under the screed ( black polythene ). That might be pierced or cut short. You can employ a company like rainbow polygon to search for damp with there meters. Regards. Howard
Answered28 July 2019
1

Anonymous user

There are a few reasons why this would happen. Was a 1200 gauge DPM installed and lapped up onto the DPC and inspected by the Building Inspector. Is the internal DPC above floor level? Silly I know but it can happen! Has a radon gas cavity tray been installed? A lot of builders install this incorrectly which leads to damp. What insulation has been has been used within the cavity? If it’s full fill, some bricklayers allow mortar to fall within the cavity which bridges the cavity walls. Damp can then penetrate across. I would suggest employing a local Building Surveyor.
Answered28 July 2019
1

Anonymous user

Check the roof. Any leeks can seep down behind wall (especially if it’s dot and dab plasterboard)
Answered28 July 2019
1

Jw carpentry and build

Rating: 5 out of 5
Bristol
So sorry to hear this problem I personally think it's two things, your extension could be below doc, or there could not be any polythene membrane when they did your oversight which would draw moisture up through the floor screed. May be best to get another contractor to to check these works are correct.
Answered28 July 2019
0

Abbey House Building Ltd

Rating: 5 out of 5
Burnley
Hi, Put a dehumidifier in the room and extract all moisture from walls, could take up to a month. Has the cavity been insulated? Has black 1200 gauge DPM been installed along with 100mm kingspan or equivalent below slab? Wipe the skirtings with neat bleach on rag this should keep at bay for longer. Employ Independant surveyor to carry out full survey and report, if he finds issues you can then make a claim in the original builders insurance to rectify the issue is work is found at fault. Also speak to building inspector asking he’s signed off at each stage and as him to provide any pictures he may have, also ask for his opinion may save on paying for independant surveyor.
Answered28 July 2019
0

Cannon Builders

Rating: 4.9 out of 5
Redruth
It could be damp bridging from the outer skin to the inner floor. maybe the membrane under the concrete was not taken far enough up the foundation blockwork, and the cavity is not clear. If the membrane is not under the DPC or the cavity is full of muck, damp could bridge across, and suck up. put a damp meter on the floor , start where you don't have a problem and see what the difference is. If it is the above, the easiest way rectify is remove floor screed about two feet all around, remove plaster back to blockwork two feet high, TANK the walls two coats tanking slurry, put it back together
Answered28 July 2019
0

AM Hall Builders

Rating: 5 out of 5
Cheltenham
You need to ask whether the dam proof membrane to the floor was laid on to damp course to inside block work otherwise you get a gap all the way round where potential damp can rise up, also the ground outside needs to be 150mm lower than damp course as this can cause bridging another potential problem
Answered28 July 2019
0