Super Insulation:
My adventures in Extreme Insulation
Here is how I've been super insulating my old house (doubling + typical R's- Click Here for why THIS is super insulation) with it's endless challanges, uniquness, variability, and really really tiny attics! Click here for the how's and why's.
The nitty gritty, dusty, sweaty, details:
Eave Baffles
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Links to:
Summary
Before
Eaves
Baffles
Air Sealing
After
Rube Goldbergs' s exisiting attic Super Insulation / Deep Energy Retrofit.
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Phase 1: Two layers 2 inch foam 2 feet wide as walkway to work from, allow inspection and work without crushing insulation in years to come. Cover with old celotex to keep insulation unharmed.
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Phase 2: Layer of Tyvek, accept no substitute, really, is it worth the risk? Over the entire attic floor, over the 12 inches of existing insulation. This will stop air movement up from below, via wind pressure and stack effect, the main mover of moisture. Moisture should not condense on it (as a cold condensing surface), since 22 inches of insulation will be installed over it, keeping it on the 'warm side'.
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Phase 3: Retro - fitting the air / vapor barrier: RAM batt insulation, rated for vapor barrier (it's a theory), between all rafters, at eaves, over exterior wall. Yes, this will block air flow up from the eaves, such is life. It's this or what? Recall, I'm tapped out, can't hire someone to blow in insulation or rip everything out, apply spray poly U over top of ceiling. Now take sheet of 1 inch foam, cut to size between roof rafters, spray foam around edges, and RAM down ontop of that matted batt insulation, push up against nails to lock in place (leave air gap between panel and roof sheathing. Not done, now, foam up fold of Tyvek, lay against foam sheeting, RAMish batt insulation under to hold against bottom of foam. Ta Da, air vapor barrier sealed from ext. wall to ext wall.
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Phase 4: Two layers 11 inch R22 batt insulation, unfaced, and rated for vapor barrier (as I said, it's a theory). Lay seams off center. Yeah, there might be some compacting, but I prefer two layers with off center joints to retard air flow.
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Phase 5: Loose laid plastic tarp to protect insulation from odd leak.
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Phase 6: Decon. mold then use fan fold foundation foam over bottom of rafters, foil side up, to retard summer heat, protect from nails, channel heat up to peak for venting, keep roof cooler in winter, cutting back melting snow and ice damming.
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Phase 7: Install new end gable vents as high up as possible.
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