Caulking Basics Every Homeowner Should Know

Caulk is one of the cheapest materials in home maintenance, but it prevents some of the most expensive problems — water damage, air leaks, and pest entry. Here's what every homeowner should understand.

Where Caulk Matters Most

Around windows, doors, tubs, showers, sinks, and where siding meets trim. Any gap where water, air, or insects can enter needs a proper seal. Check these areas at least once a year.

Types of Caulk

Silicone caulk is best for wet areas like bathrooms. Paintable acrylic latex works for interior trim and baseboards. Polyurethane caulk handles exterior joints that need flexibility. Using the wrong type for the surface leads to failure within months.

Remove Before Reapplying

Applying new caulk over old caulk doesn't work — it won't bond properly. Old caulk needs to be fully removed, the surface cleaned, and then new caulk applied in a smooth, consistent bead.