How to inspect and caulk windows and doors

A cozy, efficient home doesn’t just happen—it’s maintained. One of the most overlooked yet crucial parts of that maintenance? The humble seal around your windows and doors. Over time, caulk dries out, cracks, or even peels away entirely, opening tiny gaps that let in cold drafts, unwanted moisture, and even insects. Luckily, keeping these troublemakers out is easier than you think. With a careful inspection and a fresh bead of caulk, you can instantly boost your home’s comfort, efficiency, and curb appeal. Let’s break down how to do it right.

Step 1: Examine Every Seal with Care

Start by walking around your home, inside and out. Look closely where the window or door frame meets the wall or siding. Do you see cracks? Gaps? Flaking or missing caulk? Those are clear red flags. Corners and lower edges usually show the first signs of wear—water likes to settle there.

Step 2: Remove the Old Caulk—Completely

Before you can seal again, you need a clean slate. Use a utility knife or a caulk removal tool to scrape off all the old material. Take your time—being gentle prevents damage to the frame or siding. Once everything’s cleared away, wash the area with mild soap and water to remove any grime, mildew, or dust. Let it dry fully. Remember: moisture is the enemy of adhesion.

Step 3: Pick the Right Type of Caulk

Not all caulks are created equal. For exterior use, go with something strong and weatherproof—silicone, polyurethane, or a high-quality paintable latex-silicone hybrid. Silicone offers unbeatable durability and waterproofing for outdoor conditions. Indoors, latex caulk is your best friend: easy to apply, simple to clean, and ready for paint once dry.

Step 4: Apply Like a Pro

Cut the tip of your caulk tube at a 45-degree angle—small enough to match the gap width. Load it into your caulking gun and apply steady pressure as you glide along the joint. Keep the motion smooth and continuous; avoid stopping mid-line.

Once applied, smooth the bead immediately using your finger or a finishing tool. This helps the caulk settle evenly into the seam and creates a clean, polished finish. Wipe away any extra before it starts to dry.

Step 5: Let It Cure

Patience pays off here. Most caulks need about 24 hours to fully cure, though it’s best to check the product label. Avoid exposing the area to moisture during that time. When it’s set, inspect your handiwork—no gaps, no bubbles, just a neat, watertight seal.

Inspect and re-caulk your windows and doors once a year, ideally before cold weather or heavy rains arrive. It’s a simple task that prevents expensive damage, saves energy, and keeps your home looking sharp.

A few hours of effort today can spare you a world of discomfort tomorrow—no drafts, no leaks, just peace of mind and a cozier, more efficient home.

Thanks for reading! I’m Jeff Hendricks, your trusted Realtor, here to share practical home care and real estate insights that make a difference.