Craft Quantities
Plan & Takeoffs

Materials & Quantities

Windows, glazing & curtain wall

Glass, the units it is made into, and the systems that hold it.

  • 33Calculators
  • 29Work in imperial
  • 33Work in metric

What this covers

Glass weight and lifting limits; insulating glass units — spacer, argon fill, perimeter; structural silicone bite; balustrades and glass fins; rough openings for windows, doors and skylights; unitised systems with their mullion loads, stack joints and condensation checks; and the performance figures a specification asks for, including U-factor, effective shading coefficient, acoustic and blast rating.

What decides which one you need

Whether the glass is carrying anything. A window is an opening problem — size the hole, count the units, allow for the gasket. A balustrade, a fin or a structurally glazed panel is a stress problem, and those calculators want the load and the support condition because the glass is a structural member.

What this does not cover

The flashing that keeps water out of the opening, which is roofing, and the opaque cladding beside the glazing.

Every calculator in this family

33 calculators

Mullion Stack Joint Setting Gap Calculator

Work out the gap to set at a curtain wall stack joint against the thermometer reading on the day of installation, not against the season it happens to be.

Imperial / Metric

Skylight Curb Timber Calculator

The four cut pieces of a skylight curb from the rough opening, and how far the chosen board stands above the finished roof once the covering is on.

Imperial / Metric

All of Materials & Quantities