Having watched many of your excellent videos, I decided on a cold roof because of thermal bridging issues. I must disagree with a comment made at the end of this video based on theoretical knowledge only i.e. no access to thermal imaging equipment.
Constructing a warm roof on a new extension with parapet walls, I will have surplus amounts of insulation left over and am considering adding this insulation to the underside between the joists to double up the insulation, would this install have any negatives?
This video shows me testing the vapour barrier when we did a job late last year. A primer for the vapour barrier is recommended if you are going to glue down over the top of a surface that not sound and should also be used if its cold. It sticks very well sometimes too well if you let it touch itself you have to throw it away as you just won’t get it apart.
Without knowing anything about my roof, how do I know if cold or warm? House built in 1920 and previous owners have no clue as to what I am asking. They only know that it was re flashed 10 years ago, and on flat roofs, not much to re flash so not sure what they are saying.
Well this video shows warm and cold roof construction and links to a real re-roof we did in Chiswick, we changed the insulation in the flat roof from between the joists (Cold roof construction) to on top of the joist (warm roof construction) at the same time we stop the roof ventilation from flowing into the now “Warm roof ” and placed more ventilation into the existing cold roof areas.