Have you noticed some gaps around your exterior windows? Or maybe you’ve felt cold air coming through them… Either way, this may be caused by damaged exterior window caulk. If it’s been more than five years since you’ve replaced it, you’ve found the culprit!
We’ve already done the hard work and found all the details you need to know about applying caulk on exterior windows. Keep reading – you’ll be one step closer to getting rid of those drafts!
Key Takeaways
- Applying caulk on the exterior of windows is essential for energy efficiency because it reduces air and water leaks and, therefore, prevents your windows from being damaged.
- It’s important to choose a type of caulk that is suitable for the material it’s applied to and can withstand the weather conditions in your region. The most common window caulks are silicone, polyurethane, acrylic latex, and butyl rubber caulks.
- Before applying the new caulk, you should remove the old caulk. Then, clean the surface thoroughly. You should also avoid applying caulk on weep holes, movable window parts, and around window trim.
Why Should You Apply Exterior Window Caulking?
The significance of exterior window caulking is often overlooked, particularly when it needs to be replaced. However, having your windows properly sealed on the exterior is of utmost importance – not only for energy efficiency and insulation but also for preventing window frame and wall damage. Even interior windows need to be insulated with caulk!
By using caulk to seal small cracks and gaps around windows, you can significantly reduce air leaks and water infiltration. Plus, you’ll rely less on heating and cooling systems and, therefore, spend less on energy bills.
If you’ve just installed new windows, you won’t have to worry about caulking them for the next five years or so – the installers have already done that. However, it won’t hurt to check it once a year, especially if you live in a region with harsh weather conditions that may damage the caulk.
On the other hand, if the caulk hasn’t been replaced in more than five years, it’s definitely time to add this to your to-do home maintenance list to prevent window damage.
Choosing the Right Exterior Window Caulk
There are several types of window caulk, and before choosing one, you should consider the following:
- The material it needs to adhere to.
- The climate and how drastically temperatures fluctuate in your region.
- How much moisture and sunlight the windows will come in contact with.
- The size of the gap that needs to be filled with caulk.
Types of Caulk
Then, based on the answers, you can choose among several types. Silicone caulk, for example, is one of the most popular for windows. It has perfect adhesion properties and is suitable for vinyl, wood, metal, and fiberglass. This caulk type is weather-resistant and durable and can withstand UV exposure. You can also paint over silicone caulk.
Polyurethane caulk is usually used for high-stress areas because it’s more durable than silicone caulk and it doesn’t crack under movement. It is weather-resistant and works on various materials, but it takes more time to cure and is not as flexible as silicone caulking.
Acrylic latex caulk is an excellent interior caulk because it is not as durable as other caulks. However, you can also apply it outdoors around windows only if they’re not exposed to too much moisture and sunlight.
Hybrid caulk is a combination of silicone and polyurethane caulks and is, therefore, durable and weather-resistant. It has excellent adhesion properties, is paintable, and can be used on different materials.
Butyl rubber caulk is the most durable caulk on the market, thus perfect for exterior windows. It is flexible and durable, can withstand UV exposure, and won’t crack in harsh weather conditions.
Preparing Your Windows for Caulking
Before applying exterior window caulk, you have to prepare the surface properly – this is the key to ensuring that the caulk adheres as needed. First things first – remove the old layer of caulk; never apply a new caulk bead over the old one. You can use a utility or putty knife to remove it, as well as apply a commercial caulk softener on stubborn areas.
Once the old caulk is gone, clean the surface thoroughly. Apply rubbing alcohol to remove any dirt; it will leave the area spotless! Check if the window frame is intact and repair what needs to be repaired so that the caulk adheres properly.
You can apply painter’s tape along both edges of the seam where you’ll be caulking. This will help you achieve a neat finish.
We almost forgot to mention the most important tip: apply exterior caulk only on sunny days, preferably in the spring, summer, or fall, when it’s not raining, foggy, or snowing. The caulk should not be exposed to moisture for 12-15 hours after being applied.
That’s it! You’re ready to begin! Grab your caulk gun, and let’s get down to business!
How to Apply Exterior Window Caulk
Before applying the caulk, cut the tip of the caulk tube – make sure to cut it at a 45-degree angle and adjust the opening size based on how large the gap is.
Next, get the caulking gun and insert the tube into it. Apply the caulk in along the frame edges, don’t stop until you finish one side. If the window is too large or you don’t have too much experience in applying caulk, there’s no need to worry! Just apply it in two beams that meet in the middle.
Then, use a plastic spoon to smooth the caulk so that it’s uniform and fills the gaps perfectly. Remove the tape carefully and let the caulk dry for 12-15 hours (check its label for an exact timeframe) before painting it.
Common Mistakes to Avoid While Caulking Windows
Here are some don’ts when it comes to applying caulk around windows:
- Don’t apply caulk over weep holes. Weep holes are there for the reason, and that is to prevent water from accumulating within the window frame. If you apply caulk on the weep holes, they’ll be completely covered, the water won’t have anywhere to escape through, and your windows can get severely damaged.
- Don’t apply caulk on movable window parts – around the sashes or on the tracks, for example. This can seal them shut, and you won’t be able to open the windows.
- Don’t apply too much caulk or not enough caulk – try to apply just the right amount for a uniform bead.
- Don’t apply caulk around the window trim, as this can actually do more harm than good.
- As mentioned above, don’t apply caulk when it rains or snows or when it’s foggy.
- Don’t use caulk for large gaps.
- Don’t apply caulk above the window frames.
Professional vs. DIY Caulking
You can apply caulk yourself or hire a professional – ultimately, it’s up to you. If you’ve never done this before, you can hire an expert, watch him/her do this, and ask for advice so you can try it yourself next time.
However, bear in mind that applying caulk requires patience and necessary safety equipment (especially when applying it on the outside!). Last but not least, it can be quite time-consuming. Plus, improperly caulked windows can eventually lead to wall and frame damage.
Besides, if you notice that your windows or the surrounding structure show signs of damage, you should definitely contact a professional. It’s best to repair whatever is damaged before applying caulk. Windows that are rotten, for example, should be replaced altogether; unfortunately, simply reapplying caulk won’t improve their insulation and energy efficiency.
Do Your Windows Need to Be Replaced? Contact Magic!
Sometimes, replacing old caulk isn’t enough to keep that cold air out. Are your windows still drafty after you’ve reapplied caulk, are your energy bills unusually high, or have you noticed water leaking through the windows? It may be time to replace them!
Why not get some of the most durable and energy-efficient windows in the GTA that come with a 40-year warranty?! Our experts ensure proper window installation using high-quality caulking that lasts 10 years, so you won’t have to worry about any repairs in the near future.
If you want to discover how Magic has revolutionized the window industry, book a free consultation today!
Frequently Asked Questions
What kind of caulk is best for exterior windows?
You can use silicone and polyurethane caulks for exterior windows. They are durable, weather-resistant, compatible with different materials, and resistant to UV exposure. However, if you live in a region with severe weather conditions, you should choose a more durable caulk like butyl rubber caulk that won’t crack under extreme temperature fluctuations.
Should you caulk around outside windows?
You should apply caulk around windows both on the inside and the outside. It will fill the gaps and cracks that can lead to air and water leaks.
How often do exterior windows need to be caulked?
Windows usually need to be caulked on the exterior every five years, although it’s best to inspect the caulking once or twice a year to check if it’s not damaged. If you notice any cracks, replace the caulk as soon as possible.
Is window caulking important for energy efficiency?
Applying caulking around windows on the exterior is essential for maintaining the windows’ energy efficiency. Caulk seals any gaps, which reduces drafts and energy loss and eventually lowering your heating and cooling expenses.
How do I prepare my windows for caulking?
To prepare your windows for caulking, clean the area thoroughly, remove the old layer of caulk, and repair any damages. This way, you’re making sure that the caulk adheres properly and will last much longer.
Can you caulk over old caulk around windows?
Don’t caulk over old caulk around windows, as the new layer won’t adhere properly, won’t seal the gaps, and won’t last too long. Therefore, always remove the old layer of caulk before applying a new one.
When should I consider hiring a professional for caulking?
Consider hiring a professional for caulking when you need a flawless finish or if your windows show significant damage, as their expertise ensures a superior result.