How to avoid problems in flat roof and hybrid roof where you have a height restriction. Here’s a step by step illustrated guide show you the mistakes that Builders make with hybrid roofs, using an OSB deck and foil insulation, why they make them, how you can avoid your interior becoming too hot in the summer, and make your roof last for as long as you’re going to live in it.
I’ll look at warm roof, cold roof, and that one that’s in between, with the insulation between the joists.
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Build a Warm Flat Roof the Right Way
https://youtu.be/xWRLCWmqT50
How to choose PIR insulation : Size & Cut the fast way
https://youtu.be/R9UTUWh1uac
Insulation - Warm roof v cold roof v hybrid - and why should you care
https://youtu.be/_UGNgGcwhjs
0:00 intro - Height Restriction for Permitted development
0:27 Hybrid Roof Problem 1 - Roof deck is going to rot
1:14 Should you use Foil faced insulation in a flat roof?
2:01 Hybrid Roof Problem 2 - Thermal bridge - winter is cold, summer is unbearable
2:39 Greenhouse effect in your extension - created by poor insulation design
3:53 Solar gain in garden room and integrated window blinds
4:14 Air conditioning and mechanical cooling for garden rooms and house extensions
4:46 Vapour barrier for Hybrid Roof is useless
5:36 Height Rules for Permitted Development - 2.5 metres - sloping land
6:30 Comparison - Hybrid roof v warm flat roof
6:42 My Solution for correct Hybrid roof construction - avoid condensation, avoid thermal bridging & overheating
8:13 Tissue faced insulation or foil faced insulation?
8:52 Advantages of EPDM Rubber membrane
9:06 Fascia, soffit, gutters, trims and edge profile for flat roof design