Flat Dormer Roof Insulation

A layer of insulation like kingspan kooltherm k7 pitched roof board would be placed above the rafters and a second layer of kooltherm k7 between the rafters.

Flat dormer roof insulation.

Given below are 3 of the most popular methods by which you can insulate your dormer roof and the best way to tackle this task to achieve the desired results. Unfortunately too many dwellings suffer from this problem. Insulating a roof from inside is technically feasible. The rigid insulation method requires the utilisation of 150mm thick insulation in between the rafters along with a 50mm air gap in order to avert cold bridging.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Tlx silver is a vapour barrier and this structure gives no risk of surface or interstitial condensation. This is called a warm roof as the majority of the insulation is above the timbers of the roof so the roofing timbers are insulated and therefore warm. Insulating a dormer roof to insulate a new dormer the same three methods can be used however there are changes to the construction method that can be used.

There are three types of insulation solution if you have a flat roof. Since the dormer extends 2m outwards i can only imagine the insulation was either put there when the house was built or when if dormer roof was re roofed. It s what s called the cold roof principle. Can a flat roof be insulated from inside from the ceiling of the area below.

Tlx silver can be used to reduce the thickness of additional insulation required between the joists to help ensure a ventilated gap is maintained between the insulation and the deck. However after taking some photos on the flat roof it is apparent there is already some kind of insulation present. In fact it may cause damage in the long term. Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas.

With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. I ve never seen so much black mould and condensation and moisture in a new flat roof. When using the rigid form of insulation it is possible to place counter battens underneath the battens used for the tiles or slates. The traditional cold deck flat roof system is to install the insulation between and under the joists with ventilation below the timber deck.

The photos suggest 25mm of mineral fibre on the underside of the roof. They lose loads of heat and are prone to leaking causing the materials to deteriorate. In this video i look at how this has happened and the way to resolve t.