If your aluminum windows are letting air in or out of your home, you can easily fix this problem by sealing the joints. Silicone caulk is ideal for sealing around metal and glass, so this is the preferred type of caulk for sealing gaps 1/4 inch wide or less on aluminum windows. This sealant is flexible, which allows joints to contract and expand as the temperature changes. Ideally, caulk should be applied when the temperature outside is above 45 degrees Fahrenheit.
Scrape off all old glass silicone on the outside of the windows with a putty knife. Use a ladder to reach windows that are out of reach. Clean the windows’ joints with all-purpose cleaner and a cloth to remove dirt. Allow all joints to dry.
Cut the nozzle of a tube of transparent silicone caulk at a 45-degree angle with a utility knife. Insert a nail into the end of the nozzle to puncture the seal.
Put the tube of caulk into a caulking gun. Push the plunger up until it is snug against the end of the tube. Squeeze the gun’s trigger until caulk appears in the end of the nozzle.
Place the tip of the nozzle on the edge of the window joint, and squeeze the gun’s trigger to apply the caulk to the joint. Continue squeezing the trigger and sliding the tip along the joint until caulk is applied to the entire joint. Place the end of a plastic spoon in a bowl of water, and use the wet spoon to smooth out the bead of caulk. Repeat to seal all joints on the windows.
Open the windows and clean the tracks with all-purpose cleaner and a rag. Measure the length of the track with a tape measure and use a utility knife to cut rope caulking to fit in the tracks of all windows.
Place a piece of rope caulking in the window track and press it into the track with your fingers. Repeat to seal the tracks on all windows.
Close the windows. Measure the lengths of the tops of the sashes on the windows and cut rope caulking to the length of all sashes. Press the rope caulking into the top of the sashes on all windows.
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