Stopping Drafts Around New Aluminum Doors: A Practical Guide

Why Drafts Appear Around New Doors

Even a well-made door can let air through if the gap between the frame and the surrounding wall is not sealed properly. Installation is the most common cause: foam, mortar or sealant may be missing in places, or the frame may have shifted slightly while it was fixed in place.

Temperature changes also matter. Metal expands and contracts, and the surrounding masonry settles over time. A gap that was invisible on installation day can become noticeable after a few seasons.

Check the Common Leak Points

Before sealing anything, find where the air is actually moving. A simple test works well on a windy day: hold a lit incense stick or a thin strip of tissue near the edges and watch for movement.

• The bottom threshold and the floor contact line
• The hinge side and the latch side of the frame
• The top corners where the frame meets the wall
• The lock cylinder and handle openings

How Perimeter Sealing Works

Good sealing has layers. The gap behind the frame should be filled with a compatible foam or insulating material, and the visible joint should then be finished with a flexible exterior or interior sealant. The sealant must bond to both the metal and the wall surface, so the surfaces should be clean and dry before application.

Avoid filling a large gap with sealant alone, since it can crack and does not insulate well. Foam first, then a finishing bead, is the usual approach.

Weatherstripping and Threshold Adjustment

Weatherstripping is the flexible seal on the door leaf that presses against the frame when closed. Over time it compresses, hardens or tears, and it is one of the easiest parts to replace. Check that it sits evenly along the full height and width of the door.

The threshold deserves special attention. If the bottom seal does not touch the floor evenly, a small adjustment of the threshold or the seal height can make a noticeable difference. Exact tolerances depend on the door and the floor, so these adjustments are best checked on site.

When the Door Itself Needs Adjustment

If the door rubs at the top or bottom, or the latch does not engage smoothly, the leaf may be out of square. Hinge screws can loosen or the frame may be slightly twisted. Adjusting hinges or re-fixing the frame often solves both the draft and the sticking at the same time.

Do not force a door shut to close a gap. This stresses the hinges and lock and can damage the frame over time.

Getting a Lasting Result with Professional Help

Techno Kol Uzi has manufactured iron, aluminum and steel doors and windows at our Rival Street workshop in Tel Aviv since 1945. We measure the opening on site, check how the frame sits, and recommend the right sealing method and seals for your door. A written specification lets you approve the work before anything is changed.

If you are still feeling a draft after a careful check, send us photos of the gaps and the door edges and we will advise whether a simple seal replacement or a frame adjustment is needed.

Frequently asked questions

Can I seal a drafty aluminum door myself?

Yes, for simple cases such as replacing worn weatherstripping or applying a finishing sealant to a visible joint. If the frame has shifted or the gap behind it is large, a professional check is the safer choice.

Why does my new door leak air when it was just installed?

Installation gaps, incomplete foam filling, or slight frame movement can all cause this. A proper on-site check usually identifies the cause quickly.

What is the best sealant for the gap around a door?

Use a flexible, weather-resistant sealant suited to metal and masonry, applied over a foam fill rather than alone. Ask for a product recommendation based on your wall and exposure.

How often should door seals be checked?

A visual check once or twice a year is a good habit, especially before winter and after strong heat seasons. Replace seals as soon as they flatten, crack or tear.

Common mistakes to avoid

The most common mistake is filling a large gap with sealant alone, which cracks and lets air through. Another is forcing a misaligned door shut, which damages hinges and locks.

Our recommendation

Seal the gap behind the frame with foam first, finish the visible joint with a flexible sealant, and replace worn weatherstripping before adjusting anything else. If the door still rubs or sits unevenly, have the hinges and frame checked on site.

Summary

Drafts around aluminum doors are usually caused by gaps, worn seals or a door out of square, and most can be fixed with layered sealing and simple adjustments. A professional check ensures the fix lasts.

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• Protecting Floors and Walls During Door Installation Work
• Replacing Glass Inserts in Aluminum Entrance Doors
• Removing and Disposing of an Old Iron Door During Replacement
• Safety Glass Options for Aluminum and Iron Door Panels
• Installation Process for Iron Doors in Existing Walls
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