Total system weight capacity: 220 lbs combined across all doors.
Door thickness: 1-3/8 in to 1-3/4 in.
Ceiling clearance above door: 5 in required. Because the straight strap has no curved arm above the roller, it requires 1 in less clearance than J-strap bypass.
Door overlap when closed: Approximately 6 in at center — the same as J-strap bypass. If a flush center closure is required, see our double bypass hardware.
Wall header: A solid header above the opening is required for track mounting. If there is no existing header or backing in the wall, we recommend installing a minimum 1×6 hardwood board (3/4 in thick × 5-1/2 in wide) that extends past the length of the track to the next stud or structural support point on each side. No solid header and cannot install one? See ceiling mount hardware.
Door width: Each door must cover half the opening plus your chosen wall overlap on the outer edge, plus account for the 6 in center overlap. For standard rooms: each door = (opening + 10 in) ÷ 2. Example: 60 in opening → (60 + 10) ÷ 2 = 35 in per door. See our measuring guide for full formulas.
Door height: Measure from finished floor to the top of the rough opening and add 1 in. The extra inch covers the top of the opening while leaving 1/2 to 1 in of clearance at the bottom for the door to slide without dragging. If you have thick carpet, check that clearance is adequate along the full travel path before ordering.
Track length: Depends on whether you need pass-through or fully clear access — see track length section below.