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*Links to printable
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Soffits may be made
up of flat boards or cladding profiles in unvented or vented
formats.
Where ventilation is not provided
through the soffit (either directly through the board or by means
of ventilation strips) it must be provided over the top of the
fascia board.
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Certification
BBA Certification
Ventilation
*Ventilation
Requirements
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Range Notes
 Standard
lengths are 5m. Non standard lengths
may be supplied where a commercial requirement exists.
A
full range of matching, purpose-made mouldings is available for
joints, internal and external angles, as well as general purpose
trims.
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Range Information:
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Characteristics
Soffit
boards are 9mm thick.
Cladding
profiles are 6mm thick but are deeper at their interlock (16mm) to
provide for secret fixing.
Cladding
is especially suited as a soffit for large or highly visible
areas, such as porches, where the number of visible
fixings need to be minimised. Cladding also adds
interest, perceived quality and value to the property. |
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Swish Cellular PVC
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Important Design and Installation notes:
Degraded
timber must be replaced and all new timbers should be preservative
treated. Soffit
bearers must be provided to the foot of every rafter and be
securely supported at each end. A preferred method is to employ
robust battens screwed to the rafters (Fig7). An
early decision should be made as to the provision of ventilation,
either over the fascia (Fig24) or through the soffit (Fig6). Where
cladding is used allow for the overall thickness of the
cladding profile when specifying the fascia height. (Fig16). Always
specify the recommended fixing materials and fixing centres. Whilst
the bottom groove in each fascia board accommodates the soffit
board by simple push fit, Fig16 & Fig17 show alternative
relationships for the fascia and soffit. At
the wall, the soffit may be designed to sit on the last course of
bricks (Fig37) or abut to the wall. In new build situations it
is sometimes possible to dispense with several courses of bricks if
the former approach is planned into the design.
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View Images
(Printable pop up screen)
CAD Library
DXF & DWG drawings of
Individual profiles and typical installed
conditions
Important Information
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Installation Sequence
The
bearers should be checked for line and level and suitable packings
applied where required.
Install
soffit boards, nailing to each soffit bearer with 40mm Trimtop
nails (C081) or capped screws (C074).
Soffit
boards can be joined using push-fit trim C041(Fig7), cut to the
desired width and leaving a 4mm expansion gap at each board end.
(Fig3)
Allow
the soffit board to protrude beyond the rafter foot by 10mm in
order to locate into the slot at the rear of the fascia
board.
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