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How to Seal a Window from the Inside: A Simple Guide

Guide on how to seal a window from inside

Drafty windows can make your home cold, uncomfortable, and less energy-efficient. The good news is you can fix this by sealing your windows from the inside. It’s an easy way to keep the warmth in and the cold out! Follow this step-by-step guide to get the job done quickly.

Why Seal Your Windows?

Sealing your windows helps:

  • Stop cold air from sneaking in.
  • Save money on heating bills.
  • Protect your home from moisture and mold.

What You’ll Need

Before you start, gather these items:

  • Caulk (choose paintable caulk for best results).
  • A caulk gun.
  • Utility knife or putty knife.
  • Damp cloth or sponge.
  • Gloves (to keep your hands clean).

Step-by-Step Guide

1. Find the Drafts

  • On a windy day, feel around the edges of your window for cool air.
  • Use a candle or stick of incense—if the flame flickers or smoke moves, there’s a draft.

2. Clean the Window Frame

  • Remove any dust, dirt, or old caulk.
  • Use a putty knife to scrape off loose material.
  • Wipe the area with a damp cloth and let it dry completely.

3. Choose the Right Caulk

  • Acrylic Latex Caulk: Easy to apply and paint over—great for indoor use.
  • Silicone Caulk: Perfect for moisture-prone areas but not paintable.

Tip: Paintable caulk works best for indoor projects.

4. Apply the New Caulk

  • Cut the tip of the caulk tube at an angle. Make the hole small for thin gaps or larger for wide ones.
  • Load the tube into the caulk gun.
  • Slowly squeeze the gun and run a steady bead of caulk along the gap.
  • Smooth it out with your finger or a damp cloth.

5. Let It Dry

  • Check the caulk instructions for drying time. Usually, it takes about 24 hours to set fully.

Extra Tips

  • Check Every Year: Look at your windows once a year to see if they need resealing.
  • Stay Safe: Work in a well-ventilated area when using caulk.

Call the Experts

Need help sealing your windows or tackling a bigger job? Kettle Contracting is here for homeowners in Oshawa, Ajax, Pickering, Whitby City, and Toronto, Ontario. We make homes comfortable and energy-efficient. Contact us today for expert help with your renovation projects!

This simple, practical guide should make sealing your windows easy and stress-free!

Get Started

Leave your contact info for a free quote. We’re looking forward to hearing from you.