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apc
noticed in the cold weather this past week, after going up in the loft to get the xmas decorations, that the roof felt had condensation on one side of the roof.
any experience/opinions on these, which started popping up in youtube ads after some cursory googling?
https://www.manthorpebp.co.uk/roofing/roof-ventilation-–-solutions-modern-day-problem/felt-lap-vent