Manthorpe Felt Lap Vents Attic Roof Loft Ventilation Cures Condensation 50 Pack

The Manthorpe G630 Felt Lap Ventilator is a refurbishment product that is designed to increase the amount of ventilation into existing roof spaces with a lapped felt/ membrane construction. The product is intended to be fitted retrospectively to properties that have had additional loft insulation recently installed. The vent will help to combat the problem of condensation build up caused by the extra insulation by adding additional ventilation into the roof space. The product will not meet the requirement for roof space ventilation solely on its own it will only provide airflow through the felt laps into the batten void. The product has been designed as a remedial solution to help overcome the build-up of condensation in the roof space, however like all products that open the felt lap to provide ventilation it does not meet the code of practice BS 5534:2014+A2:2018 6.2.1.1 The specifier or user should be aware that the opening of felt laps on the roof may adversely affect the driving rain resistance of the slates, tiles or shingles, as well as increase the wind uplift forces acting on them., Manufacturer: Manthorpe