Flat Rooflights
Perfect for intoducing natural light.
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This is effectively the bottom track of the door. We offer the option of weathered and non-weathered thresholds. For external bi folding doors, we recommend our weathered threshold. This consists of a sunken floor track and a small upstand lip that in turn creates a weather-tight seal. The non-weathered thresholds are flush and have no lip. They ought to be used in internal or sheltered areas.