Insulate! Insulate! Insulate!

I am working on an insulation plan for my brownstone, and would like to compare/contrast with you.

At this point, the most effective and least costly method seems to be fiberglass batts, installed by yours truly. We are thinking 2 layers in the ceiling (to get to R49) with plastic vapor barrier. For the exterior walls, we are debating hard foam between furring strips v. a built-out wall stuffed with R19 pink stuff.

We are also debating insulating party walls. On one hand, why pay to heat your neighbor’s house? On the other, it’s a lot of effort.

The questions we have are about how effective other kinds of insulation are v. their cost. Anyone have experience with sheeps wool or blown foam and want to tell their tale?

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