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Answering member
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To ask the Secretary of State for the Environment, Transport and the Regions, if he is now in a position to report on the further research his Department commissioned on galvanised steel wall ties. - Includes ref to 19 January 1998 at 304 c374-5W and fact that copies of results...
To ask the Secretary of State for the Environment, Transport and the Regions, if he is now in a position to report on the further research his Department commissioned on galvanised steel wall ties. - Includes ref to 19 January 1998 at 304 c374-5W and fact that copies of results...
Asked by
Melanie Johnson
(Labour)
Answered by
Nick Raynsford
(Labour)
Answering body
Department of the Environment, Transport and the Regions
Type
Written questions
Status
Answered
Tabled on
26 July 1999
For answer on
27 July 1999
Answered on
27 July 1999
Miss Melanie Johnson: To ask the Secretary of State for the Environment, Transport and the Regions if he is now in a position to
report on the further research his Department commissioned on galvanised steel wall ties. [93805]
Mr. Raynsford: The then Energy Efficiency Minister announced on 19 January 1998, Official Report, column 374, that as part of my
Department's ongoing programme of research into rain penetration of cavity walls, she had asked for precautionary checks to be
carried out on the condition of galvanised steel wire wall ties in a sample of houses with cavity walls filled with insulation. This
followed the preliminary results of research at the BRE which indicated that there was a possibility that the life expectancy of
green coloured galvanised steel wire wall ties might be shortened when used in conjunction with urea formaldehyde from cavity fill.
These checks have now been completed along with further experimental research and an independent review of the findings.
In the houses examined, there was no premature deterioration of galvanised ties with or without the green identification film in
contact with urea formaldehyde form cavity insulation.
The further experimental research was carried out on galvanised ties with and without the green identification film. The research
comprised accelerated corrosion tests and chemical interactive tests with urea formaldehyde foam. Neither of these experiments
indicated any discernible loss of galvanising.
With these results to hand and with the benefit of an independent review undertaken by consultants WS Atkins, BRE re-examined their
earlier experimental findings. They have concluded that the accelerated corrosion observed under the experimental conditions could
have been caused by vapour from the urea formaldehyde which under certain conditions of very high humidity can lead to very high
rates of corrosion of galvanising. The conditions under which this could happen were present in the preliminary experimental
research, but were unlikely to occur in houses.
The work concludes that there is no evidence that urea formaldehyde foam cavity wall insulation shortens the lifetime of galvanised
wall ties.
Copies of these results have been placed in the House Library.
Subjects
Buildings; Insulation; Iron and steel; Research; Rain; Construction methods; Corrosion; Urea formaldehyde
Date
27 July 1999
Reference
336 c357W; 93805
House
House of Commons