Building Construction Handbook, Eighth Edition

Metal Windows ~ these can be obtained in steel (BS 6510) or in

aluminium alloy (BS 4873). Steel windows are cheaper in initial cost

than aluminium alloy but have higher maintenance costs over their

anticipated life, both can be obtained fitted into timber subframes.

Generally they give a larger glass area for any given opening size

than similar timber windows but they can give rise to condensation

on the metal components. Page 384 shows an example of an

energy efficient improvement.

top hung ventlight

1500

1500

70 x 44 timber subframe head head

121 x 70 timber

subframe sill

25 x 33

o/a metal

sash framing

25 x 33

o/a metal

framing

side hung

casement

sash

fixed

sub-light

70 x 57

transom

glass

putty

BS6510

metal

windows

mastic

seal

top

hung

vent.

4mm glass

factory

glazed

fixed

light

aluminium alloy

framing in mill,

anodised or

acrylic finishes

projecting

or flush

sills

available

STEEL FRAME SECTIONS TYPICAL VERTICAL SECTIONS

TYPICAL ELEVATION

fixed

light

Refs.:

BS 4873: Aluminium alloy windows and doorsets. Specification.

BS 6510: Steel-framed windows and glazed doors.

Metal Casement Windows