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Flash the Jambs and Head — Apply Flashing Tape to Jambs and Head

Beginner2 mins

Part of project

Window Installation · Step 3 of 8

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With the sill flashing in place, proceed to flash the vertical jambs (sides) and the head (top) of the rough opening. Apply flashing tape to each jamb, extending it from the sill flashing upwards, ensuring it overlaps the sill tape. Then, apply flashing tape to the head, ensuring it overlaps the jamb tapes. The top flashing tape should be applied last to create a shingle-lap effect, directing water down and away. Ensure all tape is pressed firmly into place for optimal adhesion and to eliminate air pockets.

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FAQs

What are the most important safety precautions to take during window installation?

Always wear safety glasses and gloves to protect against debris, sharp edges, and sealant. If working above the ground floor, use appropriate ladders or scaffolding safely. Be sure to have help to lift and position the window, as they can be heavy and awkward, preventing injury or damage.

Beyond the listed tools, what other essential supplies might a beginner need for a successful and weatherproof window installation?

You will definitely need shims (wood or plastic) to properly level and plumb the window within the rough opening. A utility knife with extra blades for cutting flashing tape, and a caulking gun for applying sealant are also crucial for a clean, professional finish.

What are common mistakes beginners make when flashing and sealing a new window that could lead to leaks?

A common mistake is not applying flashing tape in the correct shingle-fashion, which can trap water. Another is using too little sealant or not ensuring a continuous bead, leaving gaps for water intrusion. Always overlap flashing layers from bottom to top and apply sealant generously to critical areas.

Is a 2-day estimated time realistic for a beginner installing a window, and what factors could extend it?

The 2-day estimate can be realistic for a beginner with a standard-sized window and a clean rough opening. However, unexpected issues like discovering rot in the rough opening, dealing with an out-of-square frame, or struggling with the weight of the window can easily extend the project time.

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My name's Aaron Jones and today we're at a personal project, new construction on Grand Manan Island in New Brunswick, Canada. We're going to be covering a traditional flanged window install over an integrated WRB. And although this is a high-performance project and we will be adding 4 in of exterior insulation, we're just going to cover the basics today. So the

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