How to Insulate and Seal Windows and Doors to Keep Cold Air Out

Posted on November 30th, 2024 by Devine Bros

Are cold drafts sneaking in around your windows and doors? Sky-high heating bills during the winter? If your home feels less cozy and more like a wind tunnel, it might be time to weatherproof your windows and doors. Not only can this save you money on energy costs, but it will also make your home more comfortable and keep winter chills where they belong—outside! 

Here’s how to weatherproof step-by-step from our Devine Bros team using weather stripping, caulking, and insulation.

Step 1: Check for Air Leaks Around Window Frames & Doors

Before you fix a problem, you need to find it. Stand near your windows and doors on a chilly day and feel for drafts. You can also use a lit candle or incense stick—move it along the edges and look for flickering smoke to identify leaks. Once you know where the trouble spots are, it’s easier to address them and winterize your home for maximum heat retention.

Step 2: Install Adhesive Weather Stripping & Foam Tape on Windows and Doors

Weather stripping seals gaps around moveable parts of windows and doors, like where the sash or door meets the frame. Here’s how to apply it:

1. Choose the Right Material – Foam tape is great for small gaps, while V-seal stripping works well for sliding windows. Adhesive-backed rubber is durable for bigger drafts around entry doors.
2. Measure and Cut – Measure the perimeter of the window or door and cut the strip to size.
3. Clean the Surface – Ensure the area is dry and dust-free so the adhesive can stick.
4. Apply the Weather-Stripping – Press it firmly into place to form a tight seal.

The result? No more air leaks around your windows and doors!

Step 3: Use Caulk to Seal Gaps in the Window Frame and Door Edges

Caulking is the go-to solution for non-moveable parts. It seals cracks and gaps around window frames and door edges.

1. Choose the Right Caulk – Silicone caulk is perfect for outdoor use because it’s weather-resistant, while acrylic caulk works indoors and can be painted over.
2. Clean the Area – Remove any old caulk or debris to create a clean surface.
3. Apply the Caulk – Use a caulking gun to run a steady bead along the edges, filling in cracks. For a neat finish, smooth it with a damp finger or caulk tool.

Caulking ensures no sneaky drafts can make their way into your home.

Step 4: Add Window Film and Door Insulation to Reduce Heat Loss

Insulation isn’t just for your attic! Thin areas around windows and doors can benefit from some extra attention, too.

• Use Window Insulation Film – This clear plastic film can be applied over windows, creating an extra barrier to prevent heat loss. Simply secure it with double-sided tape and shrink it tight with a hairdryer for a seamless look.
• Install Door Sweeps – If you have gaps under doors, a door sweep can block cold air from coming in. Attach it to the bottom of the door for instant protection.

Step 5: Maintain Weather Stripping and Caulking for Energy Efficiency

Weatherproofing isn’t a “set it and forget it” task. Inspect the seals and insulation every year before winter. Replace worn weather stripping and reapply caulk as needed. Keeping your home energy-efficient requires a little upkeep!

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Helping Norwalk homeowners improve their lives is something Devine Brothers has been providing to their customers for over 100 years! If you’re interested in learning more about our service or need supplies, make sure to get in contact with us today! For more tips & tricks, make sure to like us on Facebook!

FAQ About How to Weatherproof Your Windows

What is the best way to weatherproof your windows?

The best way to weatherproof your windows is to use a combination of weather stripping, caulk, foam tape, and window insulation film. These methods help seal windows, reduce air leaks, and block cold air from entering your home. For maximum energy efficiency, also consider installing storm windows or insulated curtains to create an airtight seal.

What is the cheapest way to block out heat from windows?

One of the most affordable ways to block out heat is by applying reflective window film or using insulated cellular shades. You can also install foam insulation around the window frame or use tension seal and adhesive weather stripping for better temperature control. These methods are cost-effective and can lower your energy bill.

How can I make my windows waterproof?

To make your windows waterproof, apply silicone caulk around the window frame to seal any gaps or cracks. Then, use rubber or foam weather stripping around the window sashes to block moisture and air leakage. For extra protection, ensure your windows and doors have no visible leak areas and consider spray foam insulation where needed.

What can I put over my windows to keep the cold air out?

To keep the cold air from coming through the window, use window insulation film, insulated curtains, or foam tape. You can also place fabric tubes or draft stoppers at the bottom of the window to trap air and block drafts. These solutions insulate your windows and help maintain a comfortable home during the colder months.

How do I stop rain from coming through my windows?

Stopping rain involves sealing all possible leak points. Use exterior-grade caulk around the outside window frame, and replace any damaged weather stripping. Ensure proper drainage and that your window type, such as casement windows or double-hung windows, closes securely to prevent water coming through the window.

What is best to seal outside windows?

The best way to seal outside windows is with silicone caulk, as it is durable and weather-resistant. Pair it with foam weather stripping or rubber sealants for areas where cold drafts are likely. This weatherproofing method is ideal for reducing heat loss, blocking cold air, and improving overall energy efficiency in your windows for winter.