Building Construction Handbook, Eighth Edition

Extruded aluminium profiled sections are designed and

manufactured to create lightweight hollow window (and door)

framing members.

Finish † untreated aluminium is prone to surface oxidisation. This

can be controlled by paint application, but most manufacturers

provide a variable colour range of polyester coatings finished

gloss, satin or matt.

Thermal insulation † poor insulation and high conductivity are

characteristics of solid profile metal windows. This is much less

apparent with hollow profile outer members, as they can be

considerably enhanced by a thermal infilling of closed cell foam.

Condensation † a high strength 2-part polyurethane resin thermal

break between internal and external profiles inhibits cold bridging.

This reduces the opportunity for condensation to form on the

surface. The indicative U-values given on the preceding page are

based on a thermal break of 4 mm. If this is increased to 16 mm, the

values can be reduced by up to 0.2 W/m^2 K.

Hollow Core Aluminium Profiled Window Section

Aluminium Hollow Profile Casement Windows