We recently bought a home with a mansard roof and are looking for ideas to vent the attic. Currently, there is no intake (or maybe its outtake) ventilation as the walls directly meet the top of the roof (that is 10 degree slope- 2:12). We will monitor it this winter (living near Toronto) for condensation but are looking for ideas to improve that attic. We were thinking in the spring, to increase the quality of the insulation.
Would greatly appreciate those who have ideas and have also though through this issue (although I don't think the most homes have no ventilation - eves).
I looked through the garage attic down the side behind the part of the house where the mansard wall flairs out (seen halfway down the house on the outside) and noticed there are spaces along the outside of the walls. Could this be a design for air to travel up and into the attic? There is no visible light in the attic coming up from the side where these may attach.
Have you climbed out to the edge to see if there is a space to come up into the attic. It is strand they build the wall with out a bottom plate sitting on the floor. You wouldn't expect to see insulation in it if it was meant for a space.
You wouldn't want garage air going up there.
Have you climbed out to the edge to see if there is a space to come up into the attic. It is strand they build the wall with out a bottom plate sitting on the floor. You wouldn't expect to see insulation in it if it was meant for a space.
You wouldn't want garage air going up there.
We have few of those houses out here, I have never built one. Many people have trouble with the venting. Making that wall double or 1 1/2 as thick with an airspace would have been easy to to do. You would expect at least air chutes if not 2 plywood sheets with 2x4 on the flat between them. If it is venting you would be able to find it in the attic. On the far side of the top plate of the wall.
This post has been changed as of Nov 9, 2016. In particular the above photo has been replaced to show a mansard roof where there is no inlet roof ventilation in the upper portion of the mansard roof [a defect] and ventilation in the lower portion which is incorrect, because the lower portion of a ma
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