How to Install Window Flashing

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Window flashing is installed around each window in order to prevent water from entering into the various gaps around the edges. If it is windy when it is raining, water could enter the casing which could cause even more damage. If window flashing is not installed correctly, water will enter into the small spaces allowing wood to rot which could possibly lead to structural damage. In order to prevent damage, install correctly.

Things You'll Need

  • Hammer
  • Nail Set
  • Tin Snips
  • Gloves
  • Tape Measure
  • Bleach Solution
  • Rubber Gloves
  • Work Gloves
  • Towel
  • Safety Goggles
  • Spray Bottle
  • Pry Bar
  • Putty Knife
  • Nail Puller
  • Aluminum Flashing
  • Use the nail puller to remove all of the nails along the upper window edge.

  • Loosen the siding a little by prying on it so you can insert the flashing beneath the siding.

  • Use a putty knife to scrape out existing caulking.

  • Mix water and bleach solution together and pour into a spray bottle.

  • Wear rubber gloves and safety goggles to apply the solution to the casing which will remove any debris.

  • Apply silicone sealant along the edge of the window in a thin line. The sealant will prevent water from entering the casing and the siding.

  • Measure the new flashing to fit the window accurately making sure the flashing overhangs about half an inch on each end.

  • Wear gloves while you cut the flashing according to the previous measurements.

  • Slide the flashing under the siding and then nail the flashing through the existing holes.

  • Sink the nails under the surface of the siding using a nail set.

  • Fill all nail holes with wood putty and sand when the application is dry.

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