Special Works
Brawoliner helps keep college buildings damp free
Marlborough College in Wiltshire, UK is a highly respected independent school for day and boarding pupils. The College was established in 1843 by a group of Church of England clergymen. Today the College is a fully co-educational establishment catering for about 930 pupils with the great majority (98%) being boarders. The Duchess of Cambridge is a former pupil.
Of the full boarding schools across the country, Marlborough was recently ranked 4th with an 82% acceptance rate for pupils to the UK’s top 30 universities, a rating bettered only by Westminster School, St Paul’s School and Winchester College.
As with all buildings that have been in use for some considerable time, Marlborough College’s infrastructure is constantly reviewed and repaired or upgraded as necessary.
Recently part of this ongoing process there was a need for the renovation of a significant part of the College’s North Block including the building’s rainwater drainage system. The system comprises very old and ornate cast iron rain water downpipes that in places are hidden within the fabric of the wall and which take rainwater from the roof to ground level drains. In places these downpipes were leaking causing damp problems within the building. Given their design, location and accessibility they would have been very difficult to replace in keeping with the original building construction so an alternative to full replacement was sought.
RENOVATION OPTION
In looking at the options available with which to bring the rainwater downpipes back up to the standard required, Mark Norton from Architects Gray, Baynes & Shew of Oxford (
www.gbsarchitects.co.uk) contacted CJ Kelly Associates with a view to using lining techniques as the alternative to full replacement. As part of this consultation, John Kelly, Senior Partner at CJ Kelly Associates suggested that Mark as the project
Having established the scope of the problem, Steve Sampson and John Kelly met on site to discuss potential liner options. After looking at the CCTV and after various discussions John advised using a lining system that comprised the DN 100 to 150 Brawoliner 3D liner in association with a Brawo 1 resin.
A detail of the top of one of the ornate cast iron
rainwater downpipes that were in need of repair to
eliminate leakage into the building fabric.
This liner was selected because it is designed to handle cross-sectional changes within a pipe being lined and so could easily accommodate the many and frequent changes of shape, size and bends that had
24 drain TRADER | February 2016 |
www.draintraderltd.com
Marlborough College North
Block showing the scaffold off which some of the rainwater
downpipes were lined using the Brawoliner 3D system.
co-ordinator contact S&D Services of Chard, Somerset, UK, a specialist in drainage repairs and lining. This suggestion was taken up by Mark who then liaised with the College’s main works contractor, construction specialist Stepnell.
After full investigations at the College, a programme of work was established to install CIPP liners to seal some 17 rainwater downpipes. The liners would also help to reduce the potential for any further deterioration in the rainwater handling system.
Given the age of the property it was no surprise to S&D Services’ managing director Steve Sampson and his fellow Director Stephen Wadham who ran the project on site, that there were a few problems regarding the downpipes. The main problem highlighted by the CCTV inspection of the pipes was that over the lengths of these they not only changed shape and size internally but that were also other imperfections within the pipes, some of which had been generated by previous attempts to repair them.
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