Choosing the Right Bi Fold Door Threshold

When selecting a bi fold door, you might look at how well it transitions between the floor inside and the level of the outside surface. A significant variation in this can make it tricky to pass through without tripping. Don’t just look at the sample images from the company. Your floor plan at home impacts the final leveling.

Picking the most appropriate threshold means taking a hard look at the aluminium bi fold door. There are various factors to consider and include water tightness. Specific ratings tell you how well the door will resist water penetration. This ability depends upon the function of closing and fastening elements during testing. Since the quality of thresholds varies based on other factors in the home, they are not usually covered under common ratings and standards.


Components impacting the choice for your bi fold door include:

Brush Pile Seals: These will prevent friction and any sticking between the floor and the seal. While EPDM rubber gaskets provide better air seals, you may have an option for the type of seal that best suits the application.

Under Threshold Drain: Should be the same width as the threshold profile. Thresholds don’t usually have a drainage collection system, so an add-on is typically needed to collect and remove rainwater.

Canopies: A canopy system can protect against severe weather, especially if the bi fold door is exposed to the elements.

You might find special requirements depending on the installation. For example, a bi fold door installed in a high rise apartment might require a different water rating or type of threshold. It is important to look into the best cill arrangement. Also, if the weather is wetter and more severe than average where you live, you might want a door with a higher weather rating and lower transition.