London Flat Roofing. 154c Fleet Road, Hampstead, London NW3 2QX
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?
Its that time of year when condensation inside your roof will start to form, the lack of ventilation, insulation and movement of warm moist air from inside the building can all be part of the equation.
This new felt flat roof is about five years old; venting has been added to the roof as it’s a cold roof however it was found that the roofers put the new flat roof insulation on the top and formed a warm flat roof.
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.
I have a cold flat roof, tar and gravel with R13 insulation between the rafters, built in 1960. A 4/12 pitched roof has been added without removing any of the tar and gravel.
This customer in Ealing had a new flat roof and thought all his problems were over until he removed some of the pasteboard from the ceiling and saw this condensation on the underside of the new roof decking.
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.
Last year we bought a barn that was converted in the 1980’s. It already has foil-backed insulation in the roof but only 35mm and we would like to increase this – without taking the roof off, as it’s simply too expensive.
