ARCH 3007 Exam 3 - Glass

Glass

A hard brittle substance, either transparent or translucent: heat to liquify and then cool

Plate glass

Molten glass cast into frames

Costly to produce at first

Grinding and polishing improved in the 19th c.

Price drops during the 19th c.

Float glass

Ribbon of molten glass

Floated across a bath of molten tin

Harden before touching a solid surface

Parallel surfaces, superior optical quality

Annealed

Cooled slowly, breaks in shards

Laminated glass

Sandwiched polyvinyl between 2 sheets of glass

Good for skylights and overhead applications

Better sound separations (airports)

Fritted glass

Printed with a silkscreen pattern

Paint made of pigmented glass particles

Glass is dried and fired making print permanent

Tinted or reflective glass

Chemicals added to molten glass or thin films applied

Photo voltaic glass

Some light but not much of a view

Mullions

Dividers between window frames

Muntins

Grids separating individual lites

Lites

Individual panes of glass

Sash

Holds glass within the frame

Insulated glass

2 sheets of glass with airspace between

Cuts heat loss or gain in half

Also gas filled, triple glazed

Curtain wall

Most common exterior glass/skin solution

1. Cripple stud

2. Header

3. 2 top plates

4. Rough sill

5. Stud

6. Sole plate

Storefront (window wall)

Glass skin, one story, doesn’t cover structure

Stick system

All pieces assembled on site

Spider fittings

Double skin / ventilated facade

2 exterior glass skins placed in such a way that air flows in the cavity. Windows or vents open according to weather and building data

Cool climates

Create a buffer of trapped heated air

Hot climates

Ventilate, encourage a buffer of moving air

Glass ingredients

Sand, soda, lime

3 types of glass

Annealed, tempered, chemically tempered

Chemically tempered

from annealed glass - soak in alkali salt solution

tempered

from annealed glass - reheated to 1200 degrees

surfaces cool rapidly with blasts of air

core cools slowly

used in doors, railings. or near moving people

spandrel glass

opaque glass that covers structure

Bite

Amount of glass that sits in the frame