Attempting chainsaw/PERSIST retrofit… Help?
In June, I will be attempting a chainsaw retrofit of a 50-year old country cabin that faces ESE.
On the roof, we have vinyl shingles nailed into (I believe) tar papered 1×6 sheathing over 2 x 4 framing, and a chimney protrusion for boiler venting from the basement; that roof is on top of an unconditioned attic with about about 4-6″ of blown-in cellulose on top of fiberglass batting on the attic floor. Hangover for eaves and rakes is approximately 18″. There’s also a dormer on the front for two fo our bedroom window.
On the walls, there’s log cabin clapboard siding nailed directly into 2×4 framing, with carpenter bee infiltration in the clapboard, blown-in cellulose in 2/3rds of the walls and ancient fiberglass batting in the other third.
The basement is unfinished and uninsulated, but at least it’s dry – a cement slab and cinder block walls with probably a 1/2″ of stucco inside and out; there are holes in the wall for a water, septic and dryer out, and oil, phone, and data in; and a pipe in the slab for water from the well. The mechanicals (oil burner, hot water heater, water pump, electric) and the washer/dryer are all in the unfinished basement.
The first and second floors are t+g pine over uninsulated 2×4 framing. We have a pellet stove on the first floor. There are also hot-water baseboards throughout the house which we don’t want to use (oil is expensive).
There’s also a would-be solarium/actual drafty porch that is currently outside of what passes for the envelope of the house; however, it is under uninsulated roof framing on the front of the house and above uninsulated 2×4 framing joined to the front of the house; it is supported by 4×4 beams sunk into concrete in the earth. Ideally, I’d like to bring it into the envelope.
20 of the 23 windows are double-hung, single-pane and wood.
Anyway a lot of issues…
I’d like to do an energy audit. Then: tear off the siding and vinyl roofing, and cut the eaves and rakes; then I’d like to cover the house with OSB, Ice & Water, 4″ inches of polyiso, housewrap, furring and cedar t+g on the walls; for the roof I’d like to keep the 1×6 sheathing and then cover with Ice and Water, 6″ of polyiso, furring, OSB, roofwrap, and zinc panels. I’d like to spray foam the attic rafters, and put HRV ventilation in the attic. I’d also like to spray the basement rafters and put rigid foam or drywall on the ceiling, but I don’t have much height to work with. Then I’d like to do another energy audit. Ideally I’d replace the boiler and hot water heater with an oil buring on-demand water heater. I’d like to replace all the windows with Marvin Integrity.
Does that sound like a good plan? Where can I do less? Where do I need to do more. Can I do this in a month or two with a couple carpenter friends and a spray foam guy or do I need to plan for a longer build time using more paid labor?
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