Whether your sliding door needs to sit on an aluminium cill is established at the time of the survey.
Sliding door drainage.
The track where the screen sits has weep holes.
It looks like the previous owners had the same problem because there is some damage to the floor there.
The openings often become clogged with dirt and debris.
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Small slots in the exterior section of track provide drainage when water comes in contact with the glass door.
The flush drainage system ensures a cohesive design with the contemporary architectural sliding glass doors.
Face drained aluminium doors and windows have the drainage holes for any water to escape on the front face of the frame.
Windows and patio doors are designed with a weep drainage system on the exterior bottom of the frames to help protect the inside of your home.
Face drained is where the water that is designed to enter the frame through the gaskets travels down the frame at set points draining outwards and away from the building.
Use a crevice tool to clear them or spray compressed air from a can into the opening.
The innovative technology enables a large capacity for rainwater with anti corrosive properties.
I ve checked them and they drain properly.