Glazed Curtain Walls
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 5
to Rev 6
in Glazed Curtain Walls.
---
title: Glazed Curtain Walls
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### A laboratory performance mockup of representative bays is the standard verification for curtain wall and is the appropriate default for any project of consequential height or area. {note}
+### The mockup type and scope required for the curtain wall system shall be specified, with a laboratory performance mockup as the default for projects of consequential height or area.
+
```datasheet
label: Curtain Wall Mockup Required
…269 unchanged lines
### The fundamental system decision is whether the wall is assembled piece-by-piece in the field (stick-built) or shop-assembled into pre-glazed panels that are hung on the building as units (unitized). {note}
+### The curtain wall system type shall be specified, stating whether the wall is stick-built, unitized, or a hybrid of the two.
+
```datasheet
label: Curtain Wall System Type
…36 unchanged lines
### A curtain wall manages water by one of two principles. {note}
+### A face-sealed (barrier) wall relies on a single continuous exterior seal to stop all water at the outer face; it is simpler but unforgiving, because any breach in that single line lets water in with no second line of defense. {note}
+
+### A pressure-equalized rain-screen wall, the modern standard described in AAMA CW-RS-1, accepts that some water will pass the outer screen and instead defeats the forces that drive water inward. The glazing pocket and internal cavities are vented to the exterior so the air pressure inside the cavity equalizes with the wind pressure outside; with no pressure difference across the outer screen, the dominant force pushing water through joints is removed, and the small amount of water that does enter is collected on internal gutters and drained back out through weeps. The interior line is then sealed for air, and the exterior screen sheds the bulk of the water — two lines of defense instead of one. {note}
+
+### Pressure-equalized rain-screen design shall be the appropriate default for curtain wall; face-sealed design shall be limited to low-exposure conditions.
+
```datasheet
label: Water Management Principle
…6 unchanged lines
```
−### A face-sealed (barrier) wall relies on a single continuous exterior seal to stop all water at the outer face; it is simpler but unforgiving, because any breach in that single line lets water in with no second line of defense. {note}
−
−### A pressure-equalized rain-screen wall, the modern standard described in AAMA CW-RS-1, accepts that some water will pass the outer screen and instead defeats the forces that drive water inward. The glazing pocket and internal cavities are vented to the exterior so the air pressure inside the cavity equalizes with the wind pressure outside; with no pressure difference across the outer screen, the dominant force pushing water through joints is removed, and the small amount of water that does enter is collected on internal gutters and drained back out through weeps. The interior line is then sealed for air, and the exterior screen sheds the bulk of the water — two lines of defense instead of one. {note}
−
−### Pressure-equalized rain-screen design shall be the appropriate default for curtain wall; face-sealed design shall be limited to low-exposure conditions.
−
## Mullion Sightline and Depth {toc}
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## Warranties shall be written in the name of the Owner and shall be transferable for the warranty term.