Continuous Insulation Retrofit: Innie Window Detail

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I removed the clapboard siding to reveal 1x6 T&G sheathing. The windows had been replaced from the inside and the original 1957 brick molding was intact.

Removing it revealed a lucky break. 1x3 sub casing circumscribed the window and acted as the window stops for the tilt-in replacement windows installed recently.

They also provide a continuous surface for flashing tape to seal off that window opening.

I cut off the sill flush with the wall sheathing and sealed the sides and top with DuPont flashing tape.

At the bottom, I installed a wide strip of [Flexi flash] tight to the replacement window and leaving the release sheet on the outer section.

Now I installed Tyvek over the wall, cutting out at the windows.

Sealing the edges to the flashing tape that seals the 1x3s around the opening.

In this assembly, the Tyvek is really mostly for air control. The outer face of the Styrofoam will shed any water that gets behind the siding.

Now, the foam goes on.

And the sill flashing tape can be folded down and stuck to the fact of the styrofoam.

At the bottom of the wall is site-bent coil stock to keep the bugs out. The whole thing is covered with a rainscreen product called DrainVent.

Finally, I added new exterior trim and siding from TrueExterior.
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