Mullions and head
Piece length, splices, the head joint and the head receptor.
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Mullions
- Product lines
- Standard lines, or Every system in the family to see every depth.
- Mullions with tie-backs
- Continuous over the tie-backs (the default: one member over its anchors, deflection and moment taken 15% over the continuous values) or Each span as a simple span.
- Longest mullion piece
- 24'-0" standard, or a custom length up to 30'-0" (confirm it can be extruded, shipped and handled). A taller mullion gets recommended splices where the moment is zero, above a tie-back where it can.
Head joint
The head has to take the structure moving above it and the mullion's own thermal movement.
- Head joint, structure above
- Edge span / 360: give the edge beam or slab span; or Given deflection: the engineer's live-load deflection at the slab edge. With neither, the standard 1/2" is assumed and said.
- Temperature range, tolerance, sealant movement, minimum joint
- The spec's when it gives them; the standard values otherwise, each marked assumed.
- Storefront head receptor takes
- 1/2" standard. The movement either fits in it or it doesn't (then get the structure's deflection, a deeper receptor or a deflection header).
An elevation under a different edge can have its own head deflection, in the elevation's Anchors fields.