White mold in loft

12 Apr 2009
Reaction score
United Kingdom
During the summer months last year i had my loft insulation topped up from 30mm to 330mm. At the beginning of this month (when putting the Christmas tree back) I noticed condensation on the felt in the loft (which i haven't seen in the loft before) so I decided to purchase a dehumidifier to stop all this condensation from entering the loft. I've now had this dehumidifier for a few days and have noticed a vast improvement in condensation in the house and in the loft. I have however noticed that the loft now has white mould on the felt. I can't imagine it has been there too long (probably a month max) and in total the condensation has been in the loft a maximum of 2 months.

My question is now how do i deal with the mould? Could this turn into dry rot or is it too early for that? I've just put the dehumidifier directly in the loft so it should now dry out pretty quickly. Should i get someone in to spray the loft or is there something i could do myself?

Thanks for any advice.
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Please see an image of the white mould on the felt. I'm not too sure if it's on the actual wood as it's the felt that's wet and obviously i can't see what has happened where the wood has touched the felt. I'll try to have a proper look up there tomorrow - so far i've only looked through the hatch.

Regarding the image i've circled two parts - the bit in the centre is clearly mould but would you say the bit i've circled at the left is mould as well? It's hard to tell if it's some kind of wet dust or not.

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