Best Caulk for Exterior of House

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The exterior of a house is constantly exposed to sunlight, rain, wind, and extreme temperatures. Over time, gaps and cracks can form in the wood, brick, or concrete, leading to drafts, leaks, and insect infestations. Caulking is a simple and cost-effective solution to seal these gaps and prevent further damage. However, not all caulks are created equal. In this blog post, we will explore the best caulk for exterior of house, based on durability, flexibility, weather resistance, and ease of use.

Silicone Caulk

Silicone caulk is a popular choice for sealing exterior gaps and cracks, due to its long-lasting and waterproof properties. Silicone is resistant to UV rays, temperature changes, and moisture, making it ideal for use in areas exposed to direct sunlight, rain, and snow. Silicone caulk is also flexible and can expand and contract with the movement of the surfaces, preventing cracking and splitting. However, silicone caulk is difficult to paint over, and it requires a solvent-based cleaner for removal and reapplication.

Polyurethane Caulk

Polyurethane caulk is another high-performance option for sealing exterior gaps and joints. Polyurethane is known for its strong adhesion, elasticity, and resistance to weather and chemicals. Polyurethane caulk is also paintable and can be used on a wide range of surfaces, including wood, metal, and masonry. Polyurethane caulk can be applied in wet conditions and can cure quickly, allowing for faster completion of the project. However, polyurethane caulk can be more expensive than other types of caulks and requires proper ventilation during application.

Acrylic Latex Caulk

Acrylic latex caulk is a versatile and affordable option for sealing exterior gaps and cracks. Acrylic latex is easy to apply, dries quickly, and can be cleaned up with water. Acrylic latex caulk is also paintable and can be used on most surfaces, including wood, metal, and vinyl. Acrylic latex caulk is less durable than silicone or polyurethane and may shrink or crack over time, especially in areas exposed to extreme temperatures or moisture. Therefore, acrylic latex caulk may need to be reapplied more frequently than other types of caulks.


Choosing the best caulk for the exterior of your house depends on various factors, such as the type of surface, the size of the gap, and the level of exposure to weather and sun. Silicone caulk, polyurethane caulk, and acrylic latex caulk are three popular options for sealing exterior gaps and joints, each with its own advantages and disadvantages. By selecting the right caulk for your specific needs and following the manufacturer’s instructions, you can ensure a tight and long-lasting seal that protects your home from water damage, air leaks, and pests.

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