Mansard Roof Insulation Details

So now i m thinking about just insulating the little attic which is formed by the low sloped part of the.

Mansard roof insulation details.

A mansard or mansard roof also called a french roof or curb roof is a four sided gambrel style hip roof characterized by two slopes on each of its sides with the lower slope punctured by dormer windows at a steeper angle than the upper. I ve already lagged the loft but cannot get access to the cavity between the roof and upstairs walls from the loft. Mansard roof with mansard tiles. To insulate the roof you will need to use a combination of insulation to fully protect the roof.

After having dense pack installed in the building walls the mansard is the next target. The steep roof with windows creates an additional floor of habitable space a garret and reduces the overall height of the roof for a given number of. John in my opinion both slopes of a mansard roof the very steep lower roof and the shallow upper roof are roofs not walls. One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside.

Here s a diagram of the house from the side. There s a lot of heat loss from where the roof comes down the sides. I have a house with mansard roof in boston. Establish the correct number of courses of mansard tiles to maintain minimum headlap of 65mm.

Originally i was toying with the idea of closed cell spray foam for the whole mansard floor but i do not want to tear down historic plaster. Does anyone have any advice on how to retrospectively insulate a mansard roof please. Lap the roof underlay over the mansard underlay by minmum 150mm. Ensure that a clear ventilation path is maintained from eaves to ridge where insulation is positioned between the rafters.

This barrier may not be fitted to an older home and you should consider getting a contractor.