Mansard Roof Insulation

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 roof insulation.

Mansard roof with mansard tiles ensure that a clear ventilation path is maintained from eaves to ridge where insulation is positioned between the rafters. One strategy would be to incorporate the attic into the conditioned space and then use a sandwich of barriers and insulation under a furred vented. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. The mansard roof forms a projection beyond the building wall that creates a concealed space through which fire and products of combustion can travel.

A false mansardis often added to the front of. Lap the roof underlay over the mansard underlay by minmum 150mm. To insulate the roof you will need to use a combination of insulation to fully protect the roof. 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.

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. 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. I have a house with mansard roof in boston. Establish the correct number of courses of mansard tiles to maintain minimum headlap of 65mm.

After having dense pack installed in the building walls the mansard is the next target.