Mansard Roof Insulation

If the attic space remains uninhabited the air in the under roof space serves as a good thermal insulation along with the insulation of the floor.

Mansard roof insulation.

One of the best ways to protect your mansard roof from the problems of ventilation is to use a vapor barrier on the inside. After having dense pack installed in the building walls the mansard is the next target. In the case of the attic this is not at all the case. I recently purchased a home with a mansard roof i had some roofers come to give quotes to replace the top it is finished and they all recommend adding ventilation known issue with mansard s.

Mansard and gambrel style roofs have always been hard to insulate. 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. To insulate the roof you will need to use a combination of insulation to fully protect the roof. The illustration to the right shows the proper insulation of this style of roof.

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. So now i m thinking about just insulating the little attic which is formed by the low sloped part of the. Step 1 add a vapor barrier. This barrier may not be fitted to an older home and you should consider getting a contractor.

But what materials should be used to save energy on this type of house. Here the insulation is very close to the roofing material and the task is not.