Xtend Mull Details and Assembly Drawings
Assembly-level detail for joining two Xtend units. Shows how Unit B's flange positions over Unit A's mull post, where the flanges notch to align, and the fastening sequence — a companion to the Mull Profile cross-sections.
What this document covers
This drawing details the mulled-frame connection between two Xtend units, including an exterior view of how the units align and overlap.
- Integrated mull post on the right side of Unit A
- How Unit B's vertical side overlaps the Unit A mull post
- Flange notching that allows top and bottom flanges to butt up to Unit A
- Screw locations and fastening sequence
- Screen spline channel and spline detail
Installation notes
Alignment: position Unit B's flange over the mull post of Unit A, aligning the top and bottom flanges at the notches; the bottom sill flange of Unit B has the same notch for proper alignment. Fastening: install flat-head screws at the top and bottom of the Unit A mull flanges using the pre-drilled holes; self-tapping screws are provided. Aluminum framing: notify Porch Windows Direct if using aluminum framing — color-matched self-tapping hex-head screws will be provided.
