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on the links to view diagrams.
a)
Strip
footings - suitable for stable sites (Class
A or S sites)
that are flat or sloping.
Timber framed construction with brick
up to floor level may
be constructed onto strip footings in
reactive clay areas
(Class M and H sites)
b)
Pier
and Beam footings - footing beams for brick
and brick
veneer cottages on
reactive clay soils (Class M and H)
generally require piering
to stable ground. Piering is always
required where footings
are influenced by adjacent drainage
or Water Board sewer
mains.
Sites containing extremely reactive ground or uncontrolled
filling require piering
for footings of all types of construction.
c)
Foundation
Slabs (Raft Slabs). Types include the
conventional concrete
slab with perimeter and internal
beams and the (waffle
pod) slab which has internal ribs
110mm wide spaced at
1200mm centres in both directions.
This type of footing is used for all types of construction
on
all site classifications,
however, there usage is generally
restricted to sites
containing less than 2.0m of fall. For
steeply sloping sites
other types of footing construction
should be considered.
d)
Elevated
Construction. Homes on steep sites or
sites
prone to flooding generally
have elevated floors supported
on timber poles, steel
posts, brick piers or concrete
columns. Bracing
is required to control sidesway.
Timber poles can be
of treated pine or hardwood. Treated
pine poles can be set
into concrete filled holes drilled into
the ground while hardwood
poles should be supported by
a concrete plug in
the base of the drilled pier hole which
is filled with gravel.
A TermimeshTM
sock is provided at the base of all hardwood
poles for termite protection.
Steel posts are generally fixed
to concrete footing
pads or piers with bolts.
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