10 Best Caulk For Exterior Windows (2024 Update)

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If you're looking for an effective way to seal your exterior windows and doors, caulking can be a great solution. However, with so many products on the market, it can be overwhelming to choose the right one for your needs. Before making a purchase, there are a few factors to consider.

First, think about the type of material your windows and doors are made of. Some caulks may not adhere well to certain surfaces, so it's important to choose a product that is compatible with the materials you're working with. Next, consider the climate in your area. If you live in an area with extreme temperature fluctuations or frequent precipitation, you'll want a caulk that can withstand those conditions without cracking or deteriorating.

Finally, think about your level of experience with caulking. If you're a beginner, you may want to look for a product that is easy to apply and forgiving if mistakes are made. On the other hand, if you're experienced and looking for a more long-lasting solution, you may want to choose a caulk with a longer curing time and superior durability.

Are you tired of drafty windows and doors? Do you want to save money on your energy bills? Find out how caulking can help and learn about the best products on the market. Are you unsure which type of caulk to choose? Don't know how to apply it correctly? Keep reading for expert tips and tricks.

10 Best Caulk For Exterior Windows

# Product Image Product Name Product Notes Check Price
1
Ideal for sealing and caulking indoor/outdoor surfaces and joints, providing a waterproof and weather-resistant barrier.
2
The product is ideal for caulking and sealing gaps in wood surfaces, such as windows, doors, and siding.
3
This product is ideal for sealing both indoor and outdoor surfaces in a clear finish.
4
Ideal for sealing and protecting windows, doors, siding, and trim.
5
It is ideal for sealing and protecting windows and doors from air and water infiltration.
6
Ideal for sealing windows, doors and siding on buildings, with a strong and durable bond.
7
The product is ideal for sealing siding and windows with an advanced polymer formula in a 10.1 oz cartridge.
8
It is ideal for sealing gaps and joints in high movement areas, such as around windows, doors, and siding.
9
Ideal for filling gaps and cracks in various indoor and outdoor surfaces such as wood, masonry, metal, and concrete.
10
This product is ideal for sealing and waterproofing both interior and exterior surfaces.
Ideal for sealing and caulking indoor/outdoor surfaces and joints, providing a waterproof and weather-resistant barrier.
The product is ideal for caulking and sealing gaps in wood surfaces, such as windows, doors, and siding.
This product is ideal for sealing both indoor and outdoor surfaces in a clear finish.
It is ideal for sealing and protecting windows and doors from air and water infiltration.
Ideal for sealing windows, doors and siding on buildings, with a strong and durable bond.
The product is ideal for sealing siding and windows with an advanced polymer formula in a 10.1 oz cartridge.
It is ideal for sealing gaps and joints in high movement areas, such as around windows, doors, and siding.
Ideal for filling gaps and cracks in various indoor and outdoor surfaces such as wood, masonry, metal, and concrete.

1. 12 Pack Dap 18300 Dynaflex 230 Premium Indoor/outdoor Sealant – White 10.1-Oz Cartridge (18275)

The White DYNAFLEX 230 Premium Elastomeric Sealant 10.1 oz is an innovative product by DAP that boasts advanced latex sealant technology. It is specially designed to provide exceptional adhesion and create a weatherproof seal that is watertight. This cured caulk can be used for both interior and exterior applications, making it a versatile solution for all sealing needs. The product is compliant with Federal Spec. TT-S-00230C, Type II, Class A, ASTM Spec. C 920, Class 25, ensuring that it meets the highest standards of quality and performance.

Pros

  • Advanced latex sealant technology
  • Excellent adhesion
  • Watertight, weatherproof seal
  • Interior/exterior use
  • Compliant with Federal Spec. TT-S-00230C, Type II, Class A, ASTM Spec. C 920, Class 25

2. Sashco 10012 10.5oz Sashco Sealants 10.5-Ounce Redwood Big Stretch Caulk & Seal, 10.5-Ounce

The super-elastic caulk is a versatile product that can be used both indoors and outdoors. It is designed to withstand cracking, tearing or pulling away, ensuring durability and longevity. The product can be painted to match the surrounding area, making it a great option for those looking to achieve a seamless finish. The water-based formula makes it easy to clean-up with just soap and water. With a choice of 13 different colors, customers can easily find the right color to match their specific needs.

Pros

  • Super-elastic, durable and long-lasting
  • Paintable to match the surrounding area
  • Easy to clean-up with soap and water
  • Suitable for both indoor and outdoor use
  • Available in 13 different colors

3. Dap 18304 12 Pack 10.1-Ounce Dynaflex 230 Premium Indoor/outdoor Sealant, Clear

This clear Latex sealant is an ideal solution for caulking and sealing. It weighs 10.1 ounces and is made in the United States. The sealant combines the superior performance of silicone with the ease of use of latex. The product provides permanent adhesion and flexibility, making it perfect for a variety of applications.

Pros

  • Provides permanent adhesion and flexibility
  • Combines silicone performance with latex ease of use

4. Osi H2u High Performance Window, Door, Siding And Trim Sealant, 10 Ounce Cartridge, White 001, Case Of 12

This product is designed to provide superior durability, making it a reliable choice for a variety of applications. Its permanent flexibility ensures that it can withstand wear and tear without cracking or breaking. It is suitable for both indoor and outdoor use, making it a versatile option for various projects. Additionally, it can be easily cleaned up with water, making it a convenient choice for those who want to avoid harsh chemicals.

Pros

  • Superior durability
  • Permanent flexibility
  • Suitable for indoor and outdoor use
  • Easy water clean-up

5. Ge Sealants & Adhesives Ge5000 Advanced Silicone 2 Window & Door Sealant Clear, 10.1oz, 10 Fl Oz

Protect your home or workplace against water damage with the 100% Waterproof and Weatherproof silicone sealant. Its advanced formula provides a reliable seal in areas that are prone to harsh weather conditions. This sealant is a perfect solution for areas where water damage is a concern.

The cured sealant is resistant to stain-causing mold and mildew growth, ensuring a 10-year Mold-Free Product Protection. It is rain-ready in as little as 30 minutes after application, ensuring durability and resistance to shrinking or cracking due to temperature fluctuations.

This sealant offers 40% more flexibility than Class 25 sealants and 7X stronger adhesion than regular Silicone 1* sealant. It adheres to most metals and woods including aluminum, composites, brick, stone, stucco, masonry, cement board, glass, drywall, ceramic and porcelain tile, making it compatible with most materials.

Ensure a long-lasting, and strong seal with the 100% Waterproof and Weatherproof silicone sealant that provides reliable protection against water damage.

Pros

  • 100% Waterproof and Weatherproof
  • Permanently Flexible with Strong Adhesion
  • Durable and Resistant to Shrinking or Cracking
  • Compatible with Most Materials

6. Osi Quad Voc Window, Door & Siding Sealant – 10 Oz. (12 Tubes Per Carton) – 003 – Black

This pack of 12 all-season formula sealants is a reliable choice for creating a strong and durable air and moisture barrier without the need for a primer. Its superior performance and strong adhesion make it suitable for most materials. The formula is designed to be permanently flexible and has a Class 25 rating for long-term elasticity and durability in any condition. It can withstand harsh weather conditions, including water, UV rays, dust, and dirt, without cracking or yellowing. The self-tooling formula can be applied smoothly with the 4-inch professional spout, even on wet or cold surfaces. It also features easy cut-off and can be painted after curing. Please note that the packaging may vary.

Pros

  • Superior performance and strong adhesion without the need for primer
  • Permanently flexible with a Class 25 rating for long-term elasticity and durability
  • Weather-resistant and can withstand water, UV rays, dust, and dirt without cracking or yellowing
  • Easy to apply with a 4-inch professional spout and easy cut-off
  • Can be painted after curing

7. Dap 810 Winder Advanced Polymer Siding And Window Sealant, 10.1 Oz, Cartridge, Tan, Paste

This siding sealant is a high-quality solution for homeowners and contractors looking for a reliable product that can effectively seal siding of various materials. The advanced polymer formula ensures excellent performance on vinyl, fiber cement, aluminum, and wood siding. Its paintable feature makes it easy to match with the color of the siding, resulting in a seamless finish. This product is permanently flexible and can withstand harsh weather conditions, making it an ideal choice for wet weather and low-temperature application. Moreover, it doesn't shrink, and virtually has no VOC's, less than 1%, ensuring a long-lasting and eco-friendly solution for your home. The sealant can be used for both interior and exterior purposes, making it a versatile choice for any construction project.

Pros

  • Advanced polymer formula for excellent performance on various siding materials
  • Permanently flexible for long-lasting results
  • Paintable formula for a seamless finish
  • Suitable for wet weather and low-temperature application
  • No shrink and virtually no VOC's, less than 1%
  • Suitable for both interior and exterior use

8. Sashco Big Stretch Acrylic Latex High Performance Caulking Sealant, 10.5 Ounce Cartridge, Gray (Pack Of 12)

The Flexible Caulk is an excellent solution for homeowners who want to avoid repeated repairs due to the brittleness or cracking of their caulking over time. It is perfect for sealing gaps and cracks in a home while withstanding natural movement. This professional-grade sealant is permanent and waterproof, keeping the weather outside where it belongs. With its powerful adhesion and extreme elasticity, the Big Stretch Caulk can stick, twist, bend, compress, and stretch to more than 500% of its original size, making it an ideal choice for those who want a reliable and long-lasting seal. Moreover, this paintable acrylic caulk allows you to paint it in any color you like, giving you the freedom to match it with your surface's color and keep your sealant looking aesthetically pleasing.

Pros

  • Flexible and won't become brittle or cracked over time
  • Professional-grade sealant that can withstand a home's natural movement
  • Permanent and waterproof, keeping the weather outside where it belongs
  • Paintable and allows you to match it with your surface's color

9. Sashco 10008 Big Stretch Caulk Dark Brown 10.5-Ounce

Introducing the super-elastic, paintable caulk that is perfect for both interior and exterior use. This caulk is designed to withstand cracking, tearing, and pulling away, ensuring a long-lasting and durable seal. It is available in 13 different colors to match any color scheme. Its water-based formula makes clean-up a breeze; just use soap and water. With its versatility and ease of use, this caulk is a must-have for any DIY project.

Pros

  • Super-elastic for lasting durability
  • Paintable, available in 13 colors
  • Easy clean-up with soap and water
  • Versatile for both interior and exterior use

10. Red Devil 0826 100% Silicone Sealant Architectural Grade, Silicone Architectural Grade Rtv Sealant, A Water-Resistant Adhesive For Interior And Exterior Use, 9.8 Oz. Tube, Clear, 1-Pack

The Tough 100% Silicone Rubber is a reliable and high-quality sealing solution for any construction or DIY project. Its architectural grade formula ensures that it stays flexible and long-lasting, providing a secure seal that resists water and other damaging elements. Unlike other sealing solutions, this silicone rubber will not crack, shrink or peel over time, ensuring that it remains effective for years to come. It's also backed up by an impressive 50-year limited warranty, giving you peace of mind that your investment is protected. Additionally, it can be applied at temperatures below freezing, making it a versatile and practical solution for any weather condition.

Pros

  • Flexible and long-lasting sealing solution
  • Resists water and other damaging elements
  • Will not crack, shrink or peel over time
  • 50-year limited warranty for added protection
  • Can be applied at temperatures below freezing

Best Caulk For Exterior Windows FAQs

Are there any specific safety precautions to take when using caulk for exterior windows?

Yes, there are specific safety precautions to take when using caulk for exterior windows. First, it is important to wear protective gear such as gloves, safety glasses, and a dust mask to avoid inhaling any harmful chemicals or fumes. It is also important to ensure proper ventilation in the area where the caulk is being used.

When working with caulk, it is essential to read and follow the manufacturer's instructions carefully. This includes using the recommended tools and materials for the job and applying the caulk in the appropriate amount and thickness. Over-applying caulk can lead to cracks and gaps, which can compromise the window's seal and cause further damage.

Additionally, it is important to properly dispose of any unused or expired caulk, as it can be hazardous to the environment. This can be done by following local regulations for chemical disposal or contacting a hazardous waste disposal service.

By taking these safety precautions and following proper caulk application techniques, you can ensure the longevity and effectiveness of your exterior windows while keeping yourself and the environment safe.

Can caulk for exterior windows be painted over?

Yes, caulk for exterior windows can be painted over. In fact, it is recommended to paint over the caulk to provide a protective layer against the elements and to enhance the overall appearance of the windows. However, it is important to wait until the caulk is completely dry before painting over it. This can take anywhere from 24 to 48 hours depending on the type of caulk used and the weather conditions. Additionally, it is important to use a paint that is compatible with the type of caulk used to ensure proper adhesion and durability. It is also recommended to apply a primer before painting over the caulk to ensure a smooth and even finish. By following these guidelines, you can ensure that your windows are not only well-sealed but also aesthetically pleasing.

Can caulk for exterior windows be used to fill gaps or cracks in siding or other exterior surfaces?

No, caulk for exterior windows should not be used to fill gaps or cracks in siding or other exterior surfaces. This is because caulk for exterior windows is specifically designed to withstand weather and temperature changes that occur around windows. It is formulated to adhere to the materials used in window frames and to remain flexible, allowing for expansion and contraction. However, siding and other exterior surfaces are often made of different materials and require different types of sealants. Using the wrong type of caulk can result in poor adhesion, cracking, and ultimately, water damage. It is important to carefully choose the right type of caulk for each specific application. In general, silicone caulk is a good choice for filling gaps and cracks in siding and other exterior surfaces because of its durability and flexibility. It is also important to properly prepare the surface before applying the caulk to ensure a good seal.

Does caulk for exterior windows come in different colors to match the window frame or surrounding trim?

Yes, caulk for exterior windows comes in different colors to match the window frame or surrounding trim. This is because the color of the caulk can have a significant impact on the appearance of the windows and the overall look of the building. Matching the color of the caulk to the color of the window frame or surrounding trim can help to create a seamless and cohesive look that enhances the overall aesthetic appeal of the property. In addition, choosing the right color of caulk can also help to increase the durability and longevity of the windows by preventing moisture and air leaks. So, it is important to consider the color of the caulk when selecting exterior window caulk for your home or building.

How long does caulk for exterior windows typically last?

Caulk for exterior windows is an essential component of any building that helps seal gaps between the window frame and the wall, preventing water and air from entering the house. The longevity of caulk depends on the type of caulk used, the quality of the application, and the weather conditions it is exposed to. Generally, caulk for exterior windows can last between five to ten years, depending on the material and environmental factors.

Silicone and polyurethane caulk are the most durable and long-lasting options for exterior windows, lasting up to ten years or more. However, the downside is that these types of caulks are more expensive than other options. Acrylic caulk is an affordable option, but it is not as durable and may need to be replaced after five years.

In addition to the type of caulk, the quality of the application plays a significant role in determining the longevity of the caulk. Proper surface preparation and thorough cleaning before applying the caulk can improve its adhesion and lifespan. Also, exposure to harsh weather conditions such as extreme temperatures, humidity, and sunlight can affect the caulk's lifespan.

In conclusion, the lifespan of caulk for exterior windows varies depending on several factors. However, regular maintenance and inspection can help identify any cracks or gaps and ensure timely repair or replacement of the caulk, prolonging its lifespan.

How should old caulk be removed before applying new caulk for exterior windows?

Removing old caulk before applying new caulk is essential for achieving a proper seal and improving the appearance of exterior windows. To remove old caulk, first, use a utility knife or caulk removal tool to cut along the edges of the caulk. Then, use a putty knife or scraper to pry the old caulk away from the window frame. Be careful not to damage the window or surrounding surfaces. After removing the old caulk, clean the area thoroughly with soap and water or a solvent recommended by the caulk manufacturer to remove any remaining residue. Allow the area to dry completely before applying new caulk. It is important to select a caulk that is specifically designed for exterior use and is compatible with the window frame material. Apply the new caulk in a continuous, smooth bead, and use a caulk smoothing tool or finger to smooth and shape the caulk. Allow the new caulk to dry completely before painting or exposing it to water or extreme temperature changes.

Is it necessary to use a specific type of caulk for different types of window frames (wood, vinyl, aluminum, etc.)?

Yes, it is necessary to use a specific type of caulk for different types of window frames. This is because different materials require different types of caulk to ensure proper adhesion and sealing. For instance, wood frames require a caulk that is compatible with wood and can expand and contract with changes in temperature and humidity. Vinyl frames, on the other hand, require a caulk that is designed to adhere to plastic surfaces and can withstand UV rays without breaking down. Aluminum frames require a caulk that can withstand exposure to weather, extreme temperatures, and chemicals. Using the wrong type of caulk can result in poor adhesion, cracking, and ultimately, water damage. Therefore, it is important to choose the right type of caulk based on the material of your window frame to ensure a proper seal and prevent any potential issues.

What is the drying time for caulk for exterior windows and can the windows be opened during this time?

The drying time for caulk for exterior windows can vary depending on the type of caulk being used and the weather conditions. Typically, most caulks will dry and cure within 24 hours, but it is always best to check the manufacturer's instructions for specific details. It's important to note that drying time can be affected by humidity levels, temperature, and the amount of caulk applied.

If you're wondering whether you can open your windows during the drying process, it's best to wait until the caulk is completely dry before doing so. Some types of caulk can take longer to dry than others, and opening the windows too soon could cause the caulk to crack or break apart. It's always best to err on the side of caution and give the caulk ample time to dry before opening the windows or engaging in any other activities that could potentially damage the caulk. Overall, it's important to follow the manufacturer's instructions and use caution when handling caulk for exterior windows to ensure the best results.

What is the recommended temperature range for applying caulk for exterior windows?

The recommended temperature range for applying caulk for exterior windows is between 40°F and 80°F (4°C and 27°C). This is because caulk needs to be applied on a dry surface and in a temperature range that allows it to cure properly. If the surface is wet or the temperature is too low, the caulk may not adhere properly, leading to gaps and leaks. If the temperature is too high, the caulk may dry too quickly, making it difficult to work with and achieve a smooth finish. It is also important to choose the right type of caulk for the job, as some are better suited for exterior applications and can withstand harsh weather conditions. When applying caulk, make sure to follow the manufacturer's instructions and use the appropriate tools to ensure a clean and professional-looking finish.

What type of caulk is best for exterior windows?

When it comes to caulking exterior windows, it's essential to choose the right type of caulk to ensure a long-lasting, weather-resistant seal. The best caulk for exterior windows is silicone caulk. It is durable, flexible, and can withstand extreme weather conditions, including high heat, cold temperatures, and heavy rain.

Silicone caulk also adheres well to various surfaces, including wood, vinyl, and metal, making it an excellent choice for different types of windows. Another advantage of silicone caulk is that it can resist mold and mildew growth, which is crucial in damp or humid environments.

When selecting silicone caulk for your exterior windows, ensure that it is specifically designed for outdoor use and can withstand UV rays. Choose a high-quality product and follow the manufacturer's instructions for application and curing time to ensure the best results.

In summary, silicone caulk is the best option for exterior windows due to its durability, flexibility, weather resistance, and ability to resist mold and mildew growth.

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