Why is there fungus on my new ply roof (pics included)?

TonyLikeDIY · 21 Feb 2009

Hi,

I have'nt finished my roof yet as I still have to put the insulation and plasterboard up but this morning I just noticed some fungus or mold or something. I am not sure what it is but it doesnt look good.

I am building a gym so I dont think this would be good if i breathe it in.

I can't get the builders to redo the top as it already as 2 layers of torch on felt. (see pic) But is there anything I can do to fix this such as paint or some treatment?

I dont think rain is getting in but could it be due to the parafin blow torch being on to heat the gym whilst working?

Cheers

Tony

big-all · 21 Feb 2009

for every pint off parafin you burn you get a pint off water into the air

just wipe the mould off with weak bleach solution

TonyLikeDIY · 21 Feb 2009

Will this come back? Are you sure its not damaged?

Also, I was thinking about getting parafin heaters when my gym is complete (as ive been told its cheaper than electric) but i am thinking this is a bad idea!!!

TonyLikeDIY · 21 Feb 2009

Anybody else have an input?

kevindgas · 21 Feb 2009

if you are going to use parafin
buy a dehumidifier as the damp will keep coming back

are you not putting a ceiling in?

TonyLikeDIY · 21 Feb 2009

I am going to put space blankets in and then plasterboard for the ceiling. If i clean the mold will this problem get worse if I dont treat or paint the shuttering ply first and just seal it in?

Cheers,

Tony

^woody^ · 21 Feb 2009

The mould is cause by moist air hitting the cold roof deck - condensation.

You will get condensation whatever heating you use

Remove the cold surface, and you remove the possibility of condensation forming on it and subsequent mould .

TonyLikeDIY · 21 Feb 2009

So if i insulalate and put up plaster board it should be warmer and so i shouldnt get condensation?

Also, should i clean the mold and paint it with something first to protect the shuttering ply?

Alastairreid · 21 Feb 2009

wipe the mould off, insulate,fit a vapour control barrier and plasterboard over.
the mould will not return!.

TonyLikeDIY · 21 Feb 2009

Thanks for that? Is the vapaour barrier a paint or a sheet material?

Tony

big-all · 22 Feb 2009

builders breathable membrane

http://www.chesterfelt.co.uk/proddisp.asp?category=1&subcat=5

TonyLikeDIY · 27 Feb 2009

Hi,

Can anyone advise me if the above advise is still valid. My problem is getting worse and i feel if i just wipe it that it will still be there. See pics below of it getting worse.

Cheers,

Tony

-

Alastairreid · 27 Feb 2009

Have you been using the parafin heater again?

the above points are all still valid........removing the cold surface removes the condensation!.

TonyLikeDIY · 27 Feb 2009

No,

I the parafin heater hasnt been used since but the door has been shut and there was condensation in there even after a whole week or so of not been in there.

So putting in insulation does this remove the cold surface?

Alastairreid · 27 Feb 2009

^woody^ said:
The mould is cause by moist air hitting the cold roof deck - condensation.

You will get condensation whatever heating you use

Remove the cold surface, and you remove the possibility of condensation forming on it and subsequent mould .

courtesy of woody.

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Why is there fungus on my new ply roof (pics included)?

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