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Seal gaps and prevent draughts by caulking your window frames. This easy D.I.Y. project helps keep your home warm and snug while making it more energy efficient.
Safety tip: Always wear the appropriate safety equipment (safety glasses, gloves, ear muffs and a mask, for example) and always follow the instructions for the product or equipment.
Start by checking for air leaks around the window frame. An easy way to do this is to light a match or candle and hold it near the frame. Any draughts will cause the flame to flicker or go out, indicating there might be a leak.
Select the right type of caulk for your windows. Look for one that’s suitable for both indoor and outdoor use. Exterior caulk is usually durable, flexible and waterproof polyurethane. For interior gaps, you can use interior or exterior caulk.
Before you apply the new caulk, you’ll need a clean, dust-free surface for it to stick to. Remove any old caulk from the window frame, then clean the area thoroughly with sugar soap wipes or a damp microfibre cloth.
Apply masking tape along the edges of the window frame, leaving around a 5mm gap. This helps achieve a clean, straight line when applying the caulk.
Insert the caulk tube into the caulk gun and cut the tip at a 45-degree angle to match the size of the gap. Give it a test on a piece of scrap paper or timber to ensure the gun is ready for a smooth application.
Start on the exterior side of the window. Apply a continuous bead of caulk along the seam where the frame meets the wall. Smooth the caulk with a finishing tool to neaten it up and form a tight seal. If you don’t have a finishing tool, you can use your finger. Moisten your fingertip in warm soapy water and drag it with light pressure along the length of the bead of caulk. When you’re done, remove the masking tape and clean up any excess with a damp cloth.
Once the caulk has dried, inspect the exterior window frame for any gaps. Touch up as needed to ensure you have a complete and tight seal around the entire window frame. Once you’re happy, move inside and repeat the process on the interior window frame.
Learn how to seal a door.
Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.
When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.