Refurbishment of Lanchester School saved £24,500 in heating costs and reduced CO2 emissions by approximately 74 tonnes per year. 
The Bauder Group, has achieved a first in environmental certification for two of its green roof products; ahead of any other roofing company in the UK. 
An innovative housing development by Metropolitan Housing Trust has been awarded a CABE Building for Life Silver Standard... 
There are two options for improving the waterproofing on a current roof; to strip off the failing system or to overlay it. In either case, the first steps are to examine the. 
If we don’t have the skills to do it, common sense tells us that a job is not only going to be difficult but also risky and costly. 
150 Cheapside is a new-build office development in the centre of London, offering 182,740 sq ft of office space with a roof terrace 
York Hospital remains operational during roofing works to refurbish the 2000sq metre failing roof above the Oncology Ward. The roof... 
Tony Russell, Deputy Director of Estates at University Campus Suffolk (UCS) in Ipswich knows all too well about the challenges of making a green building work. 
A unique fastening system enables the support elements to be installed very quickly, easily and securely without any roof penetrations. 
In recent years, changes to various sections of the Building Regulations seem to have conspired to make it very difficult to design and install flat roof waterproofing to upstands 
Applications
Whilst extensive green roofs can be constructed on most structures, the type of build-up will vary dependant upon the slope of the roof.
|
0 DEGREES
TOTALLY FLAT ROOFS |
1 to 5 DEGREESTRADITIONAL FLAT ROOFS |
6 to 15 DEGREES SHALLOW PITCH FLAT ROOFS |
16 to 25 DEGREES |
0° or “Dead Flat” Roofs
Structures of this type present the green roof with the problem that, no matter how much care is taken in it’s construction; some standing water will arise on the roof finish. This, in turn, can have a damaging effect on the vegetation if the substrate becomes saturated where localised ponding occurs and to avoid this it is necessary to use a drainage board with a profile of at least 40mm depth. Whilst Bauder have a number of products that meet this requirement, our DSE40 board is most commonly used, the choice being dependant upon a number of issues including vegetation mix, height of the roof etc.
1°-5° “Traditional” Flat Roofs
This roof slope is ideally suited for green roofing, allowing the use of the most cost-effective components, as drainage is easily achieved down the slope and there will only ever be very minor ponding which will not effect the living roof vegetation. Whilst Bauder have a number of products that meet this requirement, our DSE20 drainage/reservoir board is most commonly used, the choice being dependant upon a number of issues including vegetation mix, foot traffic requirement etc.
6°-15° “Shallow Pitched” Roofs
Roofs above 5° start to represent a challenge with regard to the shear forces that can be generated by the slope both at the waterproofing/drainage board and drainage board/substrate interfaces. In addition, water retention within the substrate mix can prove challenging dependant upon the vegetation selected. Our 75mm deep Reservoir Board allows us to effectively address most of these issues, applying the substrate mix directly into the reservoir boards specially profiled surface to provide the required retention, particularly once the plants rooting has fully established. This product and method can used on slopes from 5° upwards, but is always the prefered method for extensive green roof systems exceeding 10°. Additional anchorage may be necessary at the roof edge, dependant upon the size and length of the roof.
16°-25° “Steep Pitched” Roofs
A roof with this degree of slope presents a significantly more severe test for both the vegetation and the system build-up than a shallow pitch roof. It is also important to recognise the significant problems that this degree of slope creates for the ongoing maintenance of the vegetation, which becomes more important as the slope increases because of its visibility. The use of our 75mm reservoir board allows us to address the principal shear issues and additional cross-battening is required to support the board, as is softwood framing to provide additional restraint to the substrate and a jute ant-erosion mat for additional anchorage for the vegetation.
Whatever the slope of your roof, we would always recommend that you seek advice from the Bauder Technical Services department, to ensure that you achieve the optimum solution for your project, both on a performance and cost basis.
