@FixitwithFowler will show you how to cure condensation in your loft using Felt Lap Vents,
This is probably the fastest and cheapest way to DIY ventilate damp or hot roof spaces and at only £3 each they are a bargain!

Amazon Links to the tools and materials used:

Felt lap vents (10 pack) https://amzn.to/3wN1OCv
Felt lap vents (20 pack) https://amzn.to/40ml7Qx
Cheaper felt lap vents https://amzn.to/3SyiOXC
https://www.amazon.co.uk/shop/fixitwi...

The Amazon links above are affiliate links. It doesn't cost you anything to click on them but I do earn a small commission if you do. As an Amazon Associate I earn from qualifying purchases

Lap vents are suitable for any roof with bitumen based under felts or modern breather membranes. Even new roofs fitted with breathable membranes can suffer from a build up of condensation or trapped heat under the right conditions. Often the extra ventilation offered by 10 20 of these simple low profile lap ventilation units can solve most problems.

Disclosure:
As an Amazon affiliate, I may earn from qualifying purchases via the link in this video description
00:00 Introduction
00:30 Where does the moisture come from?
01:16 How to cure the condensation!
02:05 Vented Eves or Sofits
02:19 WATCH THIS !!!!!
02:35 Non breathable Bitumen Felt
02:48 Felt Lap Vents and how to install them
03:29 Summary