[Greenbuilding] innovative solution sought

[Sacie Lambertson]

All, We have an old house in which we want a well insulated unvented
attic.  We are replacing the existing roof (with metal) and installing a
minimal layer of XPS on top of the sheathing. We plan to use closed cell
spray underneath followed by dense pack cellulose between the rafters.  The
problem is the rafters, which are only 2x4s in this old house.  I am
looking for a creative least expensive way to provide more rafter depth for
the insulation.

(We do not want to build up the insulation on the top of the roof
 sheathing because doing so requires the added cost of completely
rebuilding the existing soffits, which are in good condition).

Will appreciate all your useful suggestions.

Sacie
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