It sounds counter-intuitive, but a well-insulated loft still needs airflow. Insulation keeps the rooms below warm by keeping the loft space cold — and a cold space needs ventilation to carry away moisture, or that moisture condenses on the timbers and felt.
Most pitched roofs are designed to draw air in at the eaves (the low edges where the roof meets the walls). If insulation is packed tight into those corners, it blocks the airflow and traps damp air. We always leave a clear ventilation gap at the eaves, using baffles where needed.
The aim is simple: insulate the loft floor well, keep the roof space ventilated, and stop household moisture getting up there in the first place. Done together, you get a warm home and a dry, healthy roof.
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