Window & Door Caulk

Window & Door Caulk is your go-to for sealing gaps around frames, trim, and siding to stop drafts, block water intrusion, and boost energy efficiency. By closing hairline cracks and larger joints, the right caulk reduces noise, prevents mold-causing moisture, and enhances curb appeal with cleaner lines. Whether you’re sealing exterior siding-to-frame joints or interior trim, choosing the proper formula and applying it correctly delivers a long-lasting, weatherproof seal.

Popular types include:
- Silicone window and door caulk: Superior flexibility, strong adhesion to glass, metal, and tile, excellent for exterior joints and wet areas; typically not paintable.
- Acrylic latex caulk: Easy to apply and clean up, paintable, great for interior trim and small gaps; look for premium elastomeric grades for movement.
- Polyurethane caulk: Tough, durable, excellent adhesion to wood, masonry, and concrete; ideal for high-movement exterior joints; longer cure time.
- Hybrid/polyether/MS polymer caulks: Paintable, low-odor, UV- and weather-resistant; a high-performance choice for mixed materials like wood to vinyl or aluminum.

Key features to consider: paintability, flexibility (joint movement rating), UV and mildew resistance, temperature application range, VOC/odor for indoor use, and cure time. Match the caulk to substrates such as wood, vinyl, aluminum, fiber cement, brick, and stucco, and pick exterior window caulk that withstands sun and rain. For bathrooms or coastal climates, choose a mildew-resistant formula.

Pro tips for clean, durable results:
- Remove old caulk, clean, and dry the surface.
- Use backer rod for gaps wider than 1/4 inch to control joint depth.
- Cut the nozzle small, apply with a steady caulk gun, and tool the bead for full contact.
- Observe temperature and cure-time guidelines before painting or exposure to rain.

With the right window caulk or door caulk, you’ll seal efficiently, save energy, and protect your home year-round.