Bottom beam or sill shall be structurally capable of supporting the total weight of the finished door and transmitting that weight plus the lateral force due to wind loading through the bottom rollers to the bottom track system.
Top beam or header shall be structurally capable of transmitting wind load forces into the top guide system.
Intermediate horizontal members or girts are normally fabricated from hot rolled structural shapes unless weight is a consideration then cold formed shapes may be substituted. Members are typically spaced so as to provide proper vertical spacing for attaching the customers exterior sheeting.
Intermediate vertical members shall be hot rolled or cold formed structural shapes as required to accommodate imposed loads.
Diagonal bracing shall be of cold formed structural shapes or welded mechanical tubing.
Construction - Except for small door sections which can be transported in one piece, WELL BILT Industries rolling doors are fabricated in sections which can be easily shipped. These sections are then bolted at the job site to clips that are welded to the vertical members.
Bottom roller and track system All bottom rollers used by WELL BILT Industries are equipped with re-lubeable anti-friction bearings. Smaller, light weight doors are supplied with vee groove rollers with caged needle anti-friction bearings for use with inverted angle track systems. Larger doors are furnished with tapered roller bearing bottom rollers designed to be used with rail track systems. All bottom roller systems are serviceable without removing the door section from the track.