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Window Weatherstripping Guide

easyHome Repair1 hr

Stop energy loss and eliminate uncomfortable drafts with this comprehensive window weatherstripping guide. Designed for homeowners and DIY enthusiasts, this tutorial teaches you how to identify air leaks, prep your window frames, and install new seals for a more energy-efficient home.

Safety Warnings

  • Use caution when using utility knives and scissors to avoid cuts.
  • Use a step ladder safely when accessing high windows.

Tools Needed

Measuring tape — Standard
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Utility knife — Retractable
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Putty knife — Standard
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Cleaning cloth — Microfiber or rag
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Materials

Weatherstripping — Foam tape, V-strip, or felt(As needed based on perimeter)
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All-purpose cleaner — Mild detergent or alcohol wipes(1 bottle)
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Steps

1
Inspect all windows for drafts or air leaks. You can identify weak points by feeling for air movement on a windy day or by holding a lit candle or incense stick near the window edges and watching for the flame or smoke to waver.
2
Remove old, crumbling, or peeling weatherstripping. Use a putty knife or flathead screwdriver to gently pry away old strips and clear any remaining adhesive residue from the surfaces.
3
Clean the window sash and frames thoroughly using a mild detergent or alcohol wipes. Ensure the surfaces are completely dry and free of dust or oils to ensure the new weatherstripping adheres properly.
4
Measure the gaps between the sash and the frame. Measure twice before making any cuts to ensure accuracy, and add 5% to 10% extra material to accommodate waste.
Window Frame Sash Tape Measure Measure Gap Check both sides Measure the gap between the sash and frame to determine strip width.
5
Cut the weatherstripping to the required lengths using a utility knife or scissors. Ensure cuts are precise so that the ends meet without leaving gaps.
6
Apply the weatherstripping to the movable parts of the window. For adhesive-backed products, peel the backing and press the material firmly into place along the sash or frame, ensuring it is applied snugly against both surfaces.
Window frame Window sash Foam strip Press firmly Peel backing and press the weatherstripping snugly into the frame.
7
Test the windows by opening and closing them. The material should compress when the window is shut to create a tight seal, but it must not interfere with the normal operation of the window.

Pro Tips

  • Warm up weatherstripping with your hands before applying to make it more flexible.
  • For maximum air sealing, combine weatherstripping on movable parts with caulk on stationary components.

When to Call a Professional

If the window frame is rotted or the sash no longer fits the frame properly, replace the window rather than weatherstripping.

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