Modern J Top Mount Bifold Barn Door Hardware Kit | 4-Door Biparting

The J top mount 4-door biparting bifold kit folds four panels accordion-style along a wall-mounted track, with two panels folding and stacking to each side of the opening — with no hardware visible on either door face. Where a J-strap hanger mounts to the front face of the door, the J top mount roller attaches to the top edge of the panel. Both door faces stay completely clear while the J-style roller arm remains visible above, maintaining the barn door aesthetic from the side. When open, the entire span clears symmetrically with 5 in of folded hardware on each side.

This is a Goldberg Brothers standard duty kit, made to order in Colorado with a limited lifetime warranty. Available in all 17 Goldberg Brothers powder coat finishes. Two 4 in pull handles are included — one per side. Ships in 10–15 business days. Total system weight capacity is 250 lbs across all four panels.

If the J-strap curve across the door face is part of your design intent, the J-strap 4-door biparting kit is the right choice. Biparting requires wall clearance on both sides — for a fully clear opening, only 5 in of clear wall is needed on each side. If clearance only exists on one side, see our 4-door one-way kits instead.