The J-strap 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. When open, the entire span clears symmetrically — both sides of the opening are occupied by stacked panels, giving a naturally balanced look without extra sizing effort. J-strap hangers mount to the front face of the outer panel on each side, carrying the familiar J-strap aesthetic across the full installation.

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 for each side. Ships in 10–15 business days. Total system weight capacity is 250 lbs across all four panels.

Biparting requires wall clearance on both sides of the opening. For a fully clear opening, only 5 in of clear wall is needed on each side — Goldberg Brothers hardware stacks two panels to just 5 in of depth. If clearance only exists on one side, see our 2-door one-way or 4-door one-way kits instead.

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