How to Keep a Draft Out of a Window

Weatherstripping

• 1

  Measure and add up the perimeters of all your windows. Purchase 5 to 10 percent more weatherstripping than the total measurement to make sure you have enough.

• 2

  Prepare the surface by cleaning it and then drying it so your weatherstripping adheres better. Apply weatherstripping only when the surface temperature exceeds 20 degrees Fahrenheit.

• 3

  Measure the window perimeter twice before cutting to prevent errors. Cut the weatherstripping to fit your measurements. Use scissors or a utility knife.

• 4

  Apply and fix the weatherstripping in the window gaps. The exact technique depends upon which of the many available materials you choose. Simply press adhesive-backed tape, adhesive-backed foam or V-strip into position. Staple or tack reinforced felt, tubular vinyl or rubber gaskets into place.

• 5

  Check that the window slides freely with the weatherstripping in place.

Caulking

• 6

  Remove old paint and caulk with a solvent, putty knife or firm brush.

• 7

  Wipe the area clean with a rag. Allow it to air-dry if it is damp.

• 8

  Caulk evenly between the wall and frame and between joints in the window frame using a caulking gun. The best technique is to hold the gun at 45 degrees to the crack and caulk continuously without interruption. Take care to fill each crack completely.

• 9

  Correct any flaws in the seal before the putty dries. Using a putty knife, push in any caulk that comes out. Add another layer with the caulking gun to areas that shrink, making a seamless seal.