What a Draft Stopper Is and Why You Make One

A draft stopper is a fabric tube you fill with sand, rice, or fiberfill and lay along the bottom of a door or window to block cold air from leaking through. You sew it yourself from two pieces of fabric and a needle—no machine required, though a sewing machine makes it faster. The whole project takes two to four hours for a beginner and costs five to fifteen dollars in materials.

Unlike weatherstripping or caulk, a draft stopper is removable, washable, and works on any door shape. You can make one for a standard door in an afternoon and have it working the same day.

Key Takeaways

  • Cut two fabric rectangles the length of your door or window opening, sew three sides closed, fill the tube with sand or rice, then stitch the fourth side shut.
  • Use any sturdy fabric—cotton, canvas, or upholstery fabric all work; avoid thin fabrics like silk that tear easily under the weight of filler.
  • Sand and rice are heavier than fiberfill and block drafts better, but fiberfill is easier to wash and does not clump over time.
  • Hand sewing with a needle and thread works fine; a sewing machine cuts the time in half but is not necessary.
  • Measure your door or window opening first, then add half an inch on all sides for seam allowance.

Measuring and Cutting Your Fabric

Measure the width of your door or window opening from frame to frame. Add one inch to that measurement—half an inch on each side for the seam. For length, measure the height of the opening and add one inch the same way. Write these numbers down.

Cut two rectangles of fabric to these measurements. A rotary cutter and ruler make straight edges easier, but scissors work fine if you go slowly. Lay one rectangle on top of the other so the right sides (the pretty sides) face each other. Pin them together around all four edges so they do not slip while you sew.

Sewing Three Sides Closed

Thread your needle and tie a knot at the end. Starting at one corner, push the needle through both layers of fabric half an inch from the edge. Use a running stitch: push the needle in and out of the fabric in a straight line, making stitches about one-eighth inch long. Keep the stitches as even as you can, but do not worry if they are not perfect—they will not show once the stopper is filled.

Sew along three sides: the two long sides and one short side. Stop when you reach the last corner of the third side. Leave the fourth side completely open—this is where you will pour in the filler. Tie off your thread with a knot on the inside of the fabric and trim the excess.

Turn the tube inside out through the open side so the right sides of the fabric now face outward. Use a pencil or chopstick to poke out the corners so they are sharp and square. Press the tube flat with an iron on low heat if you have one, or just smooth it with your hands.

Choosing and Adding Your Filler

Sand and rice are the best fillers because they are heavy and do not compress over time. Sand is cheaper and heavier; rice is easier to clean up if there is a spill. Fiberfill (the stuffing used in pillows) is lighter, washable, and does not clump, but you will need more of it to block the same amount of air.

For a standard 36-inch-wide door, use about three to four pounds of sand or rice, or a full bag of fiberfill. Measure your filler into a small bowl or cup so you can pour it in without spilling. Lay the open end of the tube over a newspaper or paper towel to catch spills, then pour the filler in slowly. Shake the tube gently as you go so the filler settles evenly.

Stop filling when the tube is firm but still slightly flexible—you should be able to bend it without it feeling like a rock. Leave about half an inch of empty fabric at the open end so you have room to sew it shut without the filler getting in the way.

Closing the Final Seam

Fold the raw edges of the open end inward by half an inch on both sides and pin them together. Thread your needle again and use a ladder stitch to close this seam invisibly. Push the needle through the fold of fabric on one side, then directly across into the fold on the other side. Slide the needle inside the fold for about half an inch, then push it back out and across to the first side again. Keep going back and forth, pulling the thread gently every few stitches so the opening closes. When the opening is fully closed, tie off the thread on the inside and trim.

If the ladder stitch feels too tricky, a regular running stitch works just as well—it will show a bit on the outside, but the stopper will work the same way.

Placing Your Draft Stopper and Checking the Fit

Lay the finished stopper along the bottom of your door on the inside, centered in the opening. It should touch the door frame on both sides and lie flat against the floor. If it is too long, it will bunch up and not seal properly. If it is too short, cold air will leak around the ends.

Close the door gently and check that it does not catch on the stopper or create a gap. The stopper should compress slightly under the weight of the door but not flatten completely. If the door does not close smoothly, the stopper is either too thick or too long—you can trim the length with scissors or remove some filler to make it thinner.

Leave the stopper in place during cold months and remove it in warm weather. You can wash it by hand in cool water with mild soap, then air-dry it flat before refilling if the filler gets wet.

Common Mistakes to Avoid

The most common mistake is making the stopper too long. Measure twice and cut once—an extra inch on the length will bunch up and leave gaps. The second mistake is filling it too full. A stopper that is rock-hard will not compress under the door and may prevent it from closing all the way.

Thin fabrics like cotton sheets or linen tear easily under the weight of sand or rice. Use canvas, upholstery fabric, or heavy cotton instead. If you are hand-sewing and your stitches are loose or uneven, the filler will eventually work its way out through the seams—go back and reinforce any weak spots with a second row of stitches.

Do not use very fine sand (like sandbox sand) because it will work through the fabric over time. Play sand or construction sand is coarser and stays put better.

Frequently Asked Questions

Can I use a sewing machine instead of sewing by hand?

Yes. Set your machine to a straight stitch and sew half an inch from the edge, the same as you would by hand. A machine takes about 20 minutes instead of two hours. Use a medium stitch length (about 2.5 on most machines) so the seams are strong enough to hold the weight of the filler.

What if my door is wider than my fabric?

Sew two pieces of fabric together end-to-end to make one long rectangle, then follow the steps as normal. Sew the seam on the inside so it does not show, and make sure the seam is strong because it will carry half the weight of the filler.

How do I know if my draft stopper is actually blocking air?

Hold your hand near the bottom of the door on the outside and feel for moving air. You should feel a noticeable difference with the stopper in place. If you still feel a lot of air, the stopper may be too short or not filled firmly enough.

Can I make a draft stopper for a window instead of a door?

Yes, but it works best on windows that open from the bottom (double-hung or sliding windows). Measure the width of the window opening and follow the same steps. Lay it on the inside sill where the window slides down to meet it.

What should I do if the filler starts leaking out?

Check the seams for holes or weak spots and reinforce them with a second row of stitches. If the leak is small, you can patch it by sewing a small piece of fabric over the hole on the inside. If the leak is large or the fabric is torn, it is faster to make a new stopper than to repair it.