Cut the nozzle tip at a 45-degree angle to match the size of your gap (start small—you can always cut more). Load the caulk gun and squeeze a steady bead ahead of the tip, pushing it into the joint. Don't overdo it—a ¼-inch bead is plenty for most cracks.
But here’s the good news: sealing those cracks is one of the easiest, cheapest, and most satisfying DIY projects you can tackle. No power tools required. No engineering degree needed. Just a Saturday morning, a few basic supplies, and the knowledge of where and how to look. Before you grab a caulk gun, you need to understand the battlefield. You are fighting a war on two fronts: sealing cracks around windows
This is where the wooden window casing meets your drywall. Over time, house settling and seasonal humidity changes cause these joints to open up. These cracks don’t leak wind , but they leak conditioned air —warm air in winter, cool air in summer—through the wall cavity. Cut the nozzle tip at a 45-degree angle