Services
Loft Condensation and Mould
Water on the underside of the roof, black spotting on the timbers or damp insulation are signs that moisture is getting into the loft and can’t get out. Treating it means finding why.
- Find the cause first
- Mould treated, damp insulation replaced
- No obligation
- Written quote first
About this service
A look at where the moisture comes from, then the work to stop it: usually ventilation, sealing, and replacing any insulation that has got wet.
What’s included
- A check for leaks, blocked eaves and moisture sources
- Treatment of mould on timbers and boards
- Removal of wet or mouldy insulation
- Ventilation improvements where they are needed
- New insulation once the loft is dry
- A written quotation before work starts
We price the job after looking at your loft. You get a written quotation before any work is agreed.
Condensation or a leak?
The first job is telling the two apart, because the fixes are different. A roof leak tends to leave a patch in one place, often below a slipped tile, a valley, a chimney or a flashing, and gets worse after rain. Condensation is spread more widely, shows up on cold mornings, often across the north-facing slope, and is worse in winter whatever the weather. Many lofts have a bit of both.
Where the moisture comes from
Most loft condensation starts in the house. Cooking, showers, drying clothes and breathing all put water into the air, and warm air rises. It gets into the loft through an unsealed hatch, gaps around pipes, cables and downlights, and extractor fans that end in the roof space instead of outside. If the loft has no way to let that moisture out, because the eaves are blocked or the roof was never ventilated, it condenses on the coldest surfaces.
What the work usually involves
- Fixing any leak first, or advising you to get a roofer if it’s a roofing job
- Treating mould on rafters, purlins and boards
- Lifting insulation that is wet, mouldy or compressed, and disposing of it
- Clearing the eaves and adding ventilation where needed
- Sealing the hatch and gaps where air leaks up from the house
- Re-insulating once everything is dry
Mould in a loft rarely affects the rooms below directly, but damp timber and wet insulation do neither the roof nor your heating bills any good. Wet insulation doesn’t insulate well.
Read more: why lofts get condensation and loft ventilation.
The process
How it works
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Tell us about your home
Send your postcode and a few details about the property and what you have noticed in the loft. It takes a couple of minutes and costs nothing.
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We get in touch
We call or email to talk through what you need and arrange a time to look at the loft.
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We survey and quote
We check the loft, in person where it needs it, and send you a written quotation that sets out the work and the price.
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You decide
There is no obligation. If you go ahead, we agree a date with you and carry out the work.
Loft Condensation and Mould: your questions answered
Is mould in the loft dangerous?
Can I just wipe the mould off?
Does wet insulation need replacing?
Is there a charge for the quote?
Ready for a free loft insulation quote?
Tell us about your home and we’ll give you a written quotation before any work begins.