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Threshold
A threshold is the bottom piece of a doorway that you step over.
Why it matters
It is a common leak point. It also affects accessibility and durability.
Where people get this wrong
A low threshold improves accessibility but must still manage water. A threshold can be installed wrong and create hidden leaks.
Real-world example
A heavy rain hits and water shows up by the door. The threshold detail is often the first place to inspect because water loves the bottom edge.
Where this hits your build
This comes up during selections and installation. Performance depends on the product and the install. A good window installed poorly still leaks.
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