Why Do Exterior French Doors Leak at the Bottom?

What this guide helps you decide

Record whether leaks occur during ordinary rain, only in wind-driven storms or after water pools outside the doors. Take photos before the area dries.

Start with the existing conditions

Inspect accessible weatherstripping, astragal seals, bottom sweeps, threshold corners and the exterior landing's drainage. A failed door seal and an exterior grading issue can appear identical from inside.

Plan materials, layout and access

Check whether the active and inactive leaves close fully and whether the threshold has been altered. Avoid sealing designed drainage paths or adding a tall bead of caulk that traps water.

Check the result and plan follow-up

Correct the entry path before repairing swollen flooring or interior trim. Recheck after another rain and document whether the repair stopped the leak.

Common mistakes to avoid

• Caulking over drainage openings
• Replacing interior trim before fixing the leak
• Ignoring the inactive-door seal

Should you DIY or hire help?

Hire a door or exterior-envelope professional if the threshold, flashing, subfloor or framing is damaged or the source remains uncertain.

Keep planning with related guides

• How to Fix a Drafty Exterior Door
• What to Measure Before Ordering Replacement Windows