+100-year-old house remodel: Flanged window installation & wall retrofit
I am remodeling a +100 year old house (located 2 hours south of Chicago, IL) and will be installing Andersen 200 Series Double Hung windows (6’x3’) that have vinyl nailing flanges.
Existing exterior wall construction from inside to out:
Plaster and shiplap (keyed to hold plaster) (both removed to add mineral wool insulation to stud cavity), 2×4 studs (original and new), horizontal lapped board siding, asphalt (or asbestos?) shingles, vinyl horizontal siding (removing to replace).
The original plan was to remove all exterior siding down to studs and retrofit with plywood, foam & new vinyl.
I no longer want to do this.
My plan for the exterior is to: remove the vinyl siding, install windows/doors, replace the vinyl siding.
My plans for the interior are:
A) Install ¼” – 3/8” plywood on interior side of stud wall (tape all joints and edges to air seal), add 1 to 1 ½” polysio (foil facing inward), strap with horizontal 1×4’s, add ½” sheetrock.
B) Install drywall over studs. Use Airfoil electrical boxes. I have also considered using either UltraTouch acoustic strips or Plymouth Foam Sill Seal gasket between the exterior studs and drywall to reduce thermal bridging. Previous experience found the UltraTouch product difficult to work with.
My questions are:
1 Would Dudley Boxes (GBA 01/25/13) work for this application? (Dudley Box flange (approximately 3”) nailed to the 2×4 studs and the flanged windows nailed to the Dudley Box) Would that support the weight of these windows? Or would you suggest another method?
2 How should I flash /seal the vinyl window flanges to the existing asphalt (or asbestos) siding? Siga Wigluv or Grace Vycor Pro or other?
3 Would interior plan A be worth the effort and cost over plan B? Would the ¼ – 3/8” plywood add any structural benefit?
Your thoughts and comments would be greatly appreciated.
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