Curtain Walling ~ this is a form of lightweight non-load bearing external
cladding which forms a complete envelope or sheath around the
structural frame. In low rise structures the curtain wall framing could
be of timber or patent glazing but in the usual high rise context, box or
solid members of steel or aluminium alloy are normally employed.
Basic Requirements for Curtain Walls ~
- Provide the necessary resistance to penetration by the
elements. - Have sufficient strength to carry own self weight and provide
resistance to both positive and negative wind pressures. - Provide required degree of fire resistance † glazed areas are
classified in the Building Regulations as unprotected areas
therefore any required fire resistance must be obtained from
the infill or undersill panels and any backing wall or beam. - Be easy to assemble, fix and maintain.
- Provide the required degree of sound and thermal insulation.
- Provide for thermal and structural movements.
head member roof slab
transoms as required
double glazing
window board
upstand edge beam
floor slab
upstand edge beam
floor slab
load of curtain walling
transferred to floor slab
or edge beam by means
of fixing bracket
one or two storey
spanning mullions
transom
infill panel
column
transom
infill or undersill panels
composed of a combination
of materials fulfilling the
fire resistance, sound and
thermal insulation and
aesthetic requirements
Curtain Walling