Attic Ventilation Contractor in Dublin and Leinster

Attic and loft ventilation problems in Ireland are almost always about moisture, not heat. Our damp, mild climate means the roof space is cold and humid for much of the year, so poor attic ventilation shows up as condensation. Look for:

• Water drops or a wet shine on the roof felt, especially on cold mornings.
• Black spots or white fuzz on the rafters and the roof boards: mould growing on timber that stays damp.
• Damp, flattened or stained insulation.
• A musty smell when you open the attic hatch.
• Rust on nails, tanks or metal brackets in the roof space.
• Stains on the bedroom ceilings under the attic.

If you see these, take photos with a flash. They tell us most of what we need to know.

Warm, moist air from the house rises into the cold attic and condenses on the coldest surfaces, the roof felt and timbers. In our surveys of Irish homes the causes of poor attic ventilation are usually one or more of these:

1. Extractor fans that vent into the attic. The bathroom fan works, but its duct ends in the roof space or has come loose. Every shower sends steam into the attic. See our page on roof vents and roof outlets.
2. Insulation pushed into the eaves. When the attic floor is insulated or topped up, insulation often blocks the gaps at the eaves that let outside air in. The attic loses its airflow.
3. No air path through the roof space. Air needs a way in low down and a way out high up. Older roofs and some renovations have neither.
4. Gaps in the ceiling below. Unsealed attic hatches, downlights and pipe openings let warm, wet air from the rooms leak up.
5. Too much moisture in the house. Drying clothes indoors and weak ventilation in the wet rooms put more water into the air than any attic can handle. Our condensation season checklist covers the house side.