Water Coming In At The Bottom Of A Door Or Patio Door

What's happening?

Everest explains that uPVC doors and windows are made to let water run off into the frame and drain out of it through holes, and that if the holes are blocked, the frame appears to leak. Water at the bottom of the door or on the sill from the frame is the typical sign. The drainage holes are on the inside of a door frame, in the left and right corners, and the test is to pour water into each hole and see whether it comes out on the outside of the frame. Other causes are separate: DoorsDirect2U lists worn weather seals and a frame that has moved among the common faults on sliding doors, and says the drainage slots in the outer track need to be kept clear so rainwater does not pool against the seals.

What usually causes it?

• Drainage holes in the frame blocked with dirt
• Drainage slots in the outer track of a sliding door blocked
• Weather seals or brush seals that are worn
• A frame that has moved, so the door no longer sits square
• Condensation on the glass or sill, mistaken for a leak

Is it dangerous?

Not in itself. Water on a threshold can rot a timber floor and make a hard floor slippery, so mop up and keep the area dry.

Can I fix it myself?

Find the drainage holes on the inside of the frame in the lower corners. Pour a little water into each and check it flows out on the outside. If it does not, clear the hole with a screwdriver or other long thin object, working it side to side, and test again until the water runs out freely. On a sliding door, clean the track and clear the drainage slots in the outer track. Do not seal the holes or the frame with silicone: that stops the frame draining.

When should you call a window fitter?

Call a window and door fitter if the drainage holes run freely and the door still leaks, if the seals are worn or the door has dropped, or if the water comes from above or the sides. They can replace the seals, adjust the door and check the frame.

What will the window fitter actually do?

• Test the drainage holes and slots and clear any blockage
• Inspect and replace worn weather seals or brush seals
• Adjust the door and its seals so it closes tightly
• Check the frame and the junction with the wall or sill for movement or gaps
• Say whether the door needs replacing

Who fixes this

• Window repair and adjustment
• Replacement doors
• Bifold and patio doors

Questions people ask

Sources & References

1. Everest: why is my uPVC door or window frame leaking?
2. DoorsDirect2U: common sliding patio door problems
3. Everest: condensation on windows