Selecting a threshold option is a trade-off between the height of the threshold and the level of weather resistance the bifold doors can offer.
Flush thresholds allow you to fit a continuous floor inside and out without the need for any kind of step. However, they might not be very good at keeping out draughts.
It’s worth considering how exposed the doors will be to the elements, but rest assured most bifold doors come with four threshold options to suit all levels of weather exposure – with the best weather-proofing coming as the threshold gets higher.
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