Pack 20 Roofing Felt Lap Vent Stops Loft Roof Condensation / Attic Space Ventilation Airflow by Manthorpe

Arrived in time. Always had trouble with damp in the roof since extra loft insulation fitted, thought about getting roofers in to fit breather tiles installed, then I saw these advertised and thought to give them a try, so I brought 2 packs and found them easy to install, and so far the few times i have been in the loft since, I have found it to be dry, job done.

Product does the job to be able to save damp in the loft space, what a great product.

Delivery was delayed because of Covid 19, but the supplier communicated this information to me.4 bed detached property built around 2006, loft space boarded out with additional insulation about 18 months ago, not long after that I started noticing condensation on the roofing felt which then dripped onto the boarding and items stored in the loft.I looked at various causes / remedies and eventually settled on these.They slide onto the edge of the roofing felt, which then creates a small air space - easy to fit takes seconds. I fitted as low down to the eaves as possible, one in every other rafter bay, each side of the loft. As soon as I fitted just a few I could feel airflow coming into the loft space and removing that vile mouldy stale smell, I also fitted a few at high level just to be absolutely certain.After a few hours and with driving January rain outside, the interior became bone dry, the roof timbers have lost that damp feel and the temperature in the loft space has dropped. These are excellent buy them.Only 4 stars because you can buy much cheaper alternatives, so I’ll assume these are superior in some way?

I wanted to improve the airflow through my loft and reduce the risk of condensation. They seem to work! They are easy to install.

Very poor product for any roof with 400 wide rafters. Won’t even go in 1 inch. Far too thick to fit between felt laps. Impossible to fit. I imagine many thousands of roofs exist where this product is useless for what it claims it can do. Beware. You will seriously damage the felt if you try to fit this product in very many situations!!!

Had a issue with roof condensation read a few options but all seemed to be expensive and hassle. Came across these and oh my gosh easy to pop in and problem instantly solved. You can feel the air moving so much better

Dead easy to fit and they work. Extra insulation tend to block eaves ventilation and these devices bring back the airflow to prevent damp and mould.

Purchased these to help with loft condensation issues.Within a couple of days, no more condensation.Really pleased with cost effective product that works like it advertised.