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carlbernsen t1_j5pll4u wrote

This sounds like a scam.
How much insulation is in the attic floor?
A cold loft has floor insulation and lots of ventilation to keep the moisture rising from the house below moving outside. There should be a gap along the top of cavity walls and a draught blowing through the loft.
A warm loft is insulated under the rafters with air moving around the timbers above the insulation.
Insulation under the tiles with air blowing around the open loft space defeats the object.
One advantage though, would be to reduce heat transfer through the roof in summer.

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shanedn OP t1_j5pn76o wrote

No insulation in the attic floor, except for a couple inches of 80yr old insulation where they added a second floor on top of the first floor and didn't put in the effort to remove it. Newer parts of the house you'll just see the ceiling drywall from the room below.

There is roughly 2-3" of spray foam under the roof decking/between the joists. Colorado front range for climate reference.

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