Adding an Insulated Envelope

The general contractor’s crew strips the existing clapboards off the building.

Removing the existing clapboards reveals a mix of building papers installed at various times throughout the building’s life.

The crew pulls the Pro Clima DA membrane tight over the existing sheathing.

The crew draws layout lines on the fabric at stud locations.

The Pro Clima DA membrane is stapled to the wall. Air-sealing tape is then applied over the staple lines.

Because the existing openings were so out of square, the crew built the window bucks in place using AdvanTech OSB and structural screws.

Each piece has to be carefully shimmed, plumbed, and leveled to make up for the irregular wall framing.

Corners are screwed together to make for a strong box.

After I-joists have been installed against the walls, the crew adds blocking around the bucks to complete the rough window frame.

A sill dam nailed to the front edge of the windowsill is flashed with 3M All Weather Flashing Tape 8067.

The Intus window is set in place.

The window's edge is sealed to the taped sill dam using Pro Clima Tescon Vana tape to form an inner airtight and watertight seal.

Finally, the Pro Clima Solitex Mento Plus drainage plane membrane is sealed to the window with Vana tape.

To preserve the air barrier at the windows, the crew applies Tescon Vana tape to the corners of the window bucks.

While taping the staple lines in the membrane, the crew also tapes the joints where the window bucks meet the membrane on the wall.

Pressing the tape down with a plastic tool activates the adhesive in the vapor-open tape.

The crew cut the existing roof eaves back flush to the wall, using a circular saw to cut through the roofing and sheathing.

A recip saw is used to cut the rafters flush with the wall sheathing.

To connect the roof and wall air control layers, the open rafter bays are sheathed over and the DA membrane is extended up past the roof edge.

At the newly defined roof edge, the shingles are lifted so the DA fabric can be tucked underneath.

The DA fabric is tucked underneath the shingles. Later, the roofing crew would seal the DA membrane to the roof while applying Grace Ice & Water Shield self-adhering membrane to the roof.

The crew uses a radial arm saw to cut wood I-joists to match the roof angle.

The crew screwa the I-joists to the wall at stud locations.

I-joists are screwed to the wall at the studs.

After rolling out Pro Clima Solitex Mento membrane directly over the I-joists, the crew stretches the fabric tight.

The Pro Clima membrane is stapled to the I-joists.

Laps and staple lines are sealed with Pro Clima Tescon Vana tape.

The crew applies horizontal strapping over the Solitex Mento fabric.

Vertical strapping is applied over horizontal strapping to provide nailing for clapboard siding.

The strapping secures the fabric to the wall, enabling the crew to blow the I-joist cavities with dense-blown cellulose insulation.

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