Is Mould Coming from the Loft? – Causes in Crewe Homes
Have you noticed black mould forming on the ceiling or upper walls of your bedrooms in Crewe — especially in corners or above windows?
You might assume it’s just condensation from daily life. But in many cases, the root cause lies above you: a poorly ventilated loft or roof space.
At Weather Wise Solutions, we frequently diagnose loft-related condensation issues in homes throughout Crewe — particularly in older terrace and semi-detached houses with little or no passive ventilation in the roof.
🧱 Why Loft Mould Is a Growing Problem in Crewe Homes
Crewe’s housing stock includes:
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Pre-1950s terraced properties
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Cavity-filled homes with sealed soffits
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Lofts with stored insulation rolls blocking airflow
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No ridge, tile, or eaves vents
These factors cause the roof space to become a moisture trap. And that trapped moisture doesn’t just affect the loft — it migrates downwards, creating high humidity in the bedrooms below.
🔍 Signs Your Loft Is Causing Mould in Bedrooms
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Black mould forming near the ceiling, even if windows are open
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Condensation on ceilings or top corners of walls
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Roof timbers feel damp or show signs of rot
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No visible vents or airflow in the loft
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Wet insulation or mould patches on roofing felt
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Bedrooms below the loft always feel “clammy”
💨 How Poor Loft Ventilation Creates Mould Below
Without airflow, your loft traps moist air from:
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Cooking, bathing, and general humidity
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Gaps around loft hatches and light fittings
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Warm air rising from unventilated living spaces
This moisture condenses on cold surfaces in the roof — and spreads downwards into bedroom ceilings and walls, causing mould and staining even when the rest of the house seems dry.
✅ How We Fix It: DMEVs + Roof Ventilation
At Weather Wise, we take a whole-property approach to loft-related mould. Our solutions often include:
🌀 DMEV Installation (Decentralised Mechanical Extract Ventilation)
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Installed in bathrooms, kitchens or utility rooms
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Pulls humid air directly outside
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Quiet, energy-efficient, and Awaab’s Law compliant
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Reduces indoor moisture before it reaches the loft
🪟 Roof Space Ventilation Improvements
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Ridge, soffit, and tile vent installation
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Eaves ventilation restoration (often blocked by insulation)
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Advice on loft hatch sealing and insulation layout
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Assessment of roofing felt and moisture traps
🛑 Why Mould Paint Alone Won’t Fix It
Anti-mould sprays and paints only treat the symptom, not the source.
Without proper ventilation and moisture control, the mould will always come back.
🧰 Why Crewe Homes Are High Risk
In areas like Wistaston, Haslington, and Coppenhall, many homes have:
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Converted lofts with no added ventilation
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Bathroom fans that vent into the loft, not outside
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Blocked eaves due to over-insulation
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Central heating but no extract systems
We see bedroom mould caused by loft condensation more often than not in these areas.
👷♂️ Why Choose Weather Wise in Crewe?
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✅ We don’t guess — we moisture-map and ventilate
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✅ Level 3 trained damp and condensation specialists
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✅ DMEV and PIV systems tailored to your property
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✅ Members of the Damp Proofing Association
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✅ Approved by the Federation of Damp
📞 Book Your Free Condensation & Ventilation Survey in Crewe
https://weatherwiseuk.co.uk/pages/contact
🧠 FAQs
Can loft condensation cause mould in rooms below?
Yes. Warm, humid air rises and collects in poorly ventilated lofts. Over time, this moisture migrates back down, leading to mould on bedroom ceilings and walls.
Will a DMEV in the bathroom help my bedroom?
Absolutely — DMEVs remove the moisture at the source before it spreads to other rooms or into the loft.
Do I need both loft and internal ventilation?
Often, yes. We assess and balance both to provide long-term protection from mould.