Mansard Roof Insulation Details

Mansard roof with mansard tiles.

Mansard roof insulation details.

Establish the correct number of courses of mansard tiles to maintain minimum headlap of 65mm. To insulate the roof you will need to use a combination of insulation to fully protect the roof. Lap the roof underlay over the mansard underlay by minmum 150mm. There s a lot of heat loss from where the roof comes down the sides.

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. John in my opinion both slopes of a mansard roof the very steep lower roof and the shallow upper roof are roofs not walls. I have a house with mansard roof in boston. Step 1 add a vapor barrier.

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. If you insulate a roof with cellulose you either need a a ventilation channel between the top of the insulation layer and the underside of the roof sheathing or b an adequately thick layer of rigid foam on the exterior side of the sheathing hard to do with. Here s the house from the front.

Does anyone have any advice on how to retrospectively insulate a mansard roof please. 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. So now i m thinking about just insulating the little attic which is formed by the low sloped part of the. 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.