Bauder Building Board

The specification 

In order to establish the exact condition of the current waterproofing system, a flat roof survey was conducted by area technical manager, Adam Marshall, which included taking core samples and a moisture mapping survey.

Core samples help to determine the construction of the roof above the deck and identifies the presence of moisture in the core site, giving guidance to the client on the best course of action. Multiple core samples are taken on each roof area to ensure the construction and condition is consistent. The condition of the existing waterproofing in all areas surveyed was found to be poor with extensive evidence of water ingress due to advanced deterioration.

To further strengthen the information provided within the Bauder CIF condition report a moisture map survey was conducted. Moisture mapping pinpoints moisture in multiple layers of insulation and waterproofing using a Troxler gauge providing the client with objective, scientific data. From this testing method the true condition of Brighouse High School’s original roof was identified and plotted, and a visual data report was produced. This appraisal is an exact scientific survey which provides explicit data on the roof’s actual condition, saving the client time and money by eliminating any doubt or guesswork as to remedial work needed.

Using the core sample results, the gauge readings could be interpreted to show the existing waterproofing on a number of the roofing areas to contain wet insulation.

After conducting the roof survey, it was determined that the existing system was beyond salvage and was therefore removed and replaced. The replacement system, Bauder Total Roof System (BTRS), was also upgraded to comply with current building regulations as the existing levels of insulation were extremely low and did not meet the minimum requirements for Section 5 of the L2B Building regulations. The wet insulation was much less thermally efficient than a dry insulation of equivalent thickness. So, heat loss and ultimately energy usage from the academy was much greater than it should be. Applying a thermal upgrade provided immediate benefits to the academy in terms of heating bills and energy usage and increased CO² emissions.

The client needed waterproofing with longevity. BTRS was specified as it’s one of our most robust systems available. This bituminous system is high quality, heavy duty and extremely tough, giving it a service life in excess of 35 years, as stated in BBA Certificate 10/4744.

Products applied 

BauderPIR FA G16
Foil-faced tapered insulation, incorporated into the specification to help improve the roof falls, overall drainage performance, and to alleviate standing water within the existing gutter channels.
 
BauderDOME rooflights
The existing rooflights also fell below current thermal and light transmittance standards with the performance continuing to decrease with age if left as they were. The service life of the rooflights were also not compatible with the service life of the new waterproofing system and so BauderDOME rooflights were installed meet the thermal performance requirements demanded by the latest Building Regulations, Part L.

System installed

Bauder Total Roof System (BTRS)