Retrofitting Exterior Insulation, Images 16-20

Vertical trim pieces are rabbeted to allow the siding to move horizontally behind them.

Sawtooth closure strips plug the gaps where the clapboards run behind the trim.

Open-cell spray foam in the attic boosted roof R-value to around 60.

The benefits of the added insulation were apparent as the job progressed.

Ice dams that used to form were gone.

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