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How to insulate and seal a patio door

Updated February 21, 2017

With energy costs continuing to rise each year, it is important to find ways to conserve the energy that you are using. Although it is difficult to insulate patio doors due to the way they are manufactured and designed, there are simple ways to help decrease the energy loss around these doors. By following these simple step-by-step instructions, you will be able to insulate and seal a patio door and so save a few dollars on your energy bills.

Remove the sliding door from the frame. Lay the door on a flat, stable surface.

Remove the old weatherstripping from the door frame and from the sliding door. Clean the areas well where the old weatherstripping was located so that you have a clean surface to install the new weather- stripping.

Install new weatherstripping to the door frame. Measure the inside of the door frame where the door and the frame meet when the door is in the closed position. Using the utility shears, cut a piece of foam weatherstripping to fit and install it according to the manufacturer's instructions.

Install new weatherstripping to the sliding door. Measure the sliding door where the old weatherstripping was located. Cut the new sliding door weatherstripping and seal to fit your door and install it according to the manufacturer's instructions.

Replace the sliding door back into the frame.

Follow the manufacturer's instructions and caulk around the outside of the sliding door where the trim meets the wall. This will fill any gaps through which air from the outside can enter.

Caulk around the inside of the house where the door frame meets the interior wall. This will decrease the percentage of energy loss in the home.

Things You'll Need

  • Foam weatherstrip
  • Sliding door weatherstripping and seal
  • Utility shears
  • Caulking gun
  • Urethane caulk
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About the Author

Cecilia Harsch has been writing professionally since 2009. She writes mainly home improvement, health and travel articles for various online publications. She has several years of experience in the home-improvement industry, focusing on gardening, and a background in group exercise instruction. Harsch received her Certified Nurses Assistant license in 2004. She attended Tarrant County College and studied English composition.