Technitherm
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The Client: Liverpool Housing Trust.
The Problem: When gale force
winds ripped the brick cladding from a 1960s tower
block, immediate action was called for. Several more blocks
were
surveyed and it was revealed that up to 70% of the wall
ties were
missing.
The Solution: To minimise
disruption to the tenants, Technitherm structural polyurethane
foam was specified, to glue the inner and outer walls
together.
The foam is mixed and injected with a hand-held gun, through
holes drilled into the mortar joints, on the outside of
the building.
Starting off as a liquid the foam then expands and sets
in the
cavity, to form a continuous structural connection between
the inner
and outer leaves. It has been used successfully in the
past to treat
properties with weak mortar joints, corroded wall ties,
poorly fitted
cavity insulation and hollow block inner leaves, where
previous attempts
at stabilisation with mechanical fixings had failed.
The Outcome: Polyurethane foams
happen to be the most efficient insulating systems,
thickness for thickness, on the market. This means the
walls
were brought up to current Building Regulation standard
and in
so doing, will save up to 25% in energy bills. Because
Technitherm
foams “in situ” it fills cracks and gaps to add to the
draught
proofing and its closed cell nature prevents penetration
from
the driving rain. Recent developments in the foam formulation
now
means Technitherm is CFC and HCFC free, with a zero ODP
(
Ozone Depletion Potential ) rating.
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