Window Sealing

Examine the entire perimeter of the window, both inside and out. Pay close attention to the meeting rails of a double-hung window, the areas where the sash meets the frame, and around any trim or molding. Look for gaps, cracks, peeling paint, or any signs of poor sealing. You can use a smoke pencil or incense stick to help visualize drafts by observing the direction of smoke.

Using a clean cloth, wipe down all surfaces that will come into contact with the sealant. Remove any dust, dirt, cobwebs, grease, or old caulk. For stubborn debris, you may need a putty knife or scraper. Ensure the areas are completely dry before proceeding.

Load a caulk gun with paintable acrylic latex caulk. Cut the tip of the caulk tube at a 45-degree angle to create a small opening. Apply a continuous bead of caulk along the identified gaps, ensuring it fills the entire crevice. Smooth the bead with a damp cloth or your finger to create a neat finish and ensure good contact with both surfaces. Wipe away any excess caulk immediately.

Measure and cut the weatherstripping to fit the length of the channels where the sash slides. Peel back the adhesive backing a few inches at a time and press the weatherstripping firmly into place along the edges of the sash where it contacts the frame when closed. Ensure it creates a snug fit without obstructing the window's operation.

Clean the interior window frame thoroughly. Cut a piece of window insulation film large enough to cover the entire window opening, plus a few extra inches on each side. Use double-sided tape to attach the film to the interior frame, ensuring it is taut. Use a hairdryer on a low setting to gently heat and shrink the film, creating a smooth, wrinkle-free surface. Be careful not to overheat the film.

Open and close the window several times to ensure the weatherstripping and caulk have not obstructed its movement. Allow the caulk to cure according to the manufacturer's instructions. Once cured, perform another draft inspection, using the smoke pencil or by feeling for air movement, to confirm the effectiveness of your sealing efforts.