Old house insulation
My husband and I are in the process of renovating our bungalow built in 1955. All the plaster has been removed from the walls, and there was no insulation. We see from the interior that there’s wood sheathing covered with slightly damaged tar paper, and 1” vertical wood straps at every 16”. We want to improve the house’s air tightness and to add insulation, but we can’t loose too much internal space. Removing the bricks and adding exterior insulation is not an option. We are planning to have all windows replaced.
We have watched the following video from Matt Risinger and we are wondering if a similar approach should be followed for house, and if so, to what extent. Link to the video: https://youtu.be/jhoQ_f9ZnzQ
We are in a colder climate (Quebec, Canada); The exterior of the house is brick.
My questions are:
2) Should we replace the old tar paper? If so, what material should we use?
3) What would be insulation strategy to maximize R-value without loosing too much interior space? We were considering closed cell spray foam or rigid foam boards to provide air and thermal barriers, and loosing 3-4” of space, depending if we keep the original wood straps for the air gap or if we remove then.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part