How to seal a gap under a glass door
Gaps under glass doors let in pests like spiders and leave openings vulnerable to leaks. Standard fixes like caulk are difficult to line up neatly, making it hard to seal the opening without ruining the appearance.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Using caulk along the bottom
- 2Replacing the door sweep at the bottom of the door
- 3Caulk it
- 4installing a quarter round
- 5using a cove molding
- 6adding a transition strip
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Freshly installed doors left a 0,5 cm gap between the threshold and building stairwell. How do i fill the gap so it doesnt leak and look somewhat acceptable?”source ↗
“There are a ton of gaps under our outer glass door, and with the fall time, we’ve been seeing more spiders than ever.”source ↗
“I tried using caulk some years back but I couldn’t easily get it to line up perfectly.”source ↗
“Thanks so much i need to google that. Might go with a quarter round as another person stated”source ↗
“this area where the French doors are located is driving me crazy, idk if maybe it’s the flooring cuts or does there need to be one of those transition strips here?”source ↗
“Just bought a new exterior door to replace a bad one and when I got it home and looked it over I noticed that the sill / threshold had this gap, same on other side just not as bad is this normal and should it be siliconed after door is installed?”source ↗
Where this came up
People with this problem also raised
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