I have a 1926 cape code style home. It has amazing charm including lath and plaster walls but also some draft, uneven hvac flow and an upstairs that is fridged in the winter and hot in the summer.
Through my own investigation and a few contractors that have come out with IR guns here is what I know to be the situation.
1. We have knee walls and most is insulated with r11 fiberglass batting along the roof. Much of the batting is coming out of the cavities and is dirty and appears wind washed.
2. We have ~3ft of sloped cathedral ceilings which most are insulated using the same batting. The rafters are 2×4 and so there isn’t a lot of space in there. Using the IR gun there are some trouble areas and some bays that appear to have been skipped entirely. There are no soffit vents and there for no vents heading to the attic.
3. The attac has decent space to move and do work. Two large gable vents for ventilation and 3 inches of cellulose probably original or super old.
4, 4here is no insulation in the walls or basement (half of which is finished).
Based on my research I would like to use Mineral-Wool batting followed by rigid foam insulation for the knee walls. Thus keeping the knee wall as part of the conditioned space for the duct work and plumbing. Thoughts?
for the cathedral ceiling one contractor said leave it and the other said they could try and pull out whatever they can and then dense pack cellulose. They mentioned this could damage the walls. How should I proceed on this issue.l? What about loos fill Mineral-Wool?
for the attack I’m thinking adding on top of the cellulose to R50?
any recommendations on the walls?
thanks for any help.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part