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Early warning "leaky" signs for home owners and developers in case your builder/architect/supplier has dumped you in it' |
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Some key factors to observe and to get right on any home: • ‘Good boots’ and ground clearance. A well built and
maintained house has all ground-water deflected away and cladding well
clear of wet ground. As a guide, a brick breather-slot should be 250 mm
above wet ground. • If the ‘hat’ fits: roof flashings. A well-built home
has the metal flashings turned out to deflect water into the gutter and
the cladding clear of the flashings. As a guide, cladding should be at
least 30 mm off the roof and the metal flashings turned out, so water
deflects into the gutter. • Deck edges. Water needs to be correctly deflected and plaster
not able to ‘wick’/draw-up water from a deck. As a guide,
water must be turned out. • Cracks and wildlife. Well-maintained homes are dry and it is very
rare for ants to visit and colonise in the walls. Ants look for water.
If they are getting into the cracks and under the cladding, chances are
your house has serious leaks in the walls. • Mouldy curtains and linings. Well-ventilated rooms allow internal
moisture to escape. The Building Code states one air change per hour is
required. Excessive internal moisture allows mould to grow on curtains
and on much of the internal furniture as well. • Window flashings. Well-flashed windows rarely leak or cause damage.
Proper sill flashings, with turned up ends and sealant positioned at the
ends to turn water out, are what’s needed. • Parapet caps. A metal cap turned up at the wall prevents water
getting in behind the cladding. Cracks where the cladding meets the house
probably mean water is getting in and will cause significant damage --
if it has not already happened. • Gutters. Well-fitted outside gutters can safely overflow outside
the building, without doing any damage. Complex shapes inside some gutters
have meant the gutter is cut away, allowing water to overflow onto the
soffit (enclosed gutters) where it often gets into the wall and behind
the cladding, causing the timber to swell and crack the outside plaster
and the interior linings around window openings, as well as rotting the
framing. Timber penetrations through cladding. Correct flashing will deflect water
from getting behind the wall cladding. A big overhang (soffit or eave)
will reduce the chances of rainwater getting in. Timber beams that penetrate
wall claddings need more than expert maintenance -- in all probability
they need to be |
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