Exterior doors are the closest transfer from standard window flashing because they interrupt the same wall drainage plane.

At the jambs and head, tie the tape back into the WRB sequence so water moves past the door instead of behind the exterior finish.

OSI Butyl Flashing Tape can support that tie-in where the tape is placed in the drainage sequence and pressed into full contact.

Keep your lap sequence working out and down, and treat the sill or threshold sequencing as a separate transition detail.

A flanged wall vent, utility block, or light block creates another break in the WRB.

Flashing tape can help you tie that flange or trim-block edge back into the wall drainage plane so water sheds past the opening instead of working behind the exterior finish.

Set the tape around the flange with the WRB sequence in mind. Start low, lap the sides into the WRB sequence, and finish the head so water sheds over the face of the detail instead of behind it.

A deck ledger interrupts how water moves at the exterior wall.

On the wall side of the ledger, flashing tape can tie the WRB into the flashing sequence so water moves away from the wall instead of collecting behind the ledger area.

Use deck flashing tape in that wall-side role: a tape layer tied into the wall drainage path. Deck framing still needs the products and details specified for that work.

Use OSI Butyl Flashing Tape where it can bond to the WRB or a compatible wall-side flashing surface and lap into the drainage path.

Metal flashing and required ledger details remain part of the build, and the tape supports the wall-side sequence around them.A deck ledger interrupts how water moves at the exterior wall.

Exterior sheathing joints, seams, and localized cracks are easiest to address while the drainage layer is still open. If you find one before the area is covered with cladding or trim, use flashing tape to bridge the discontinuity where you can press the adhesive into full contact with the surrounding surface.

Place the tape so it carries water over the joint and back into the drainage path. Use it to carry the flashing layer across the area.

If the sheathing is damaged or the gap is larger than a localized discontinuity, correct that condition before you cover it with tape.

Corners and returns change the direction of the water path, so a WRB overlap needs to turn cleanly with the wall.

You can use flashing tape where an overlap, corner, or return needs to carry the drainage path across compatible surfaces. Carry the lap so water sheds onto the next shingled layer instead of behind the turn.

At outside corners, inside returns, and wall-surface transitions, press the tape tight through the plane change. A loose edge or lifted corner can break the drainage path even when the tape is in the right location.

At sills and thresholds, plan the water exit path before setting the tape.

These details move from horizontal to vertical, so flashing tape has to follow the drainage sequence instead of simply covering the transition.

Set your lap sequence so water can move out and down from the sill or threshold.

The same sequencing logic behind window flashing tape still applies here: a tight bond only helps when the lap gives water a way out of the transition.

Across these six uses, the install comes down to three field controls:

• Bond: Start with the surface in front of you. OSI Butyl Flashing Tape works from a clean, dry, compatible contact at the WRB, flange, sheathing face, or wall-side flashing surface. Because WRBs vary, confirm adhesion before using the tape across the project. Then correct anything that breaks contact: remove dust and contamination, clear frost, dry wet areas, and secure loose facer before you set the tape.
• Lap: Once the tape has a sound surface, set your lap sequence shingle-style so water drains out and down. At horizontal-to-vertical transitions, build the tape layout around the exit path instead of asking the adhesive to hold back water.
• Drain: After placing the tape in the drainage path, press it into full contact with a J-roller or equivalent pressure method. Work out any wrinkles, bubbles, fishmouths, and loose edges so the tape stays seated across the detail.

Use the same bond-lap-drain method for details that belong to the wall drainage plane. Wall openings and WRB tie-ins should route back into that drainage plane. Roof penetrations follow the roofing system’s specified boots, flashings, and underlayment details.