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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