Maintenance & Refurbishment
Roofing & Cladding Feature
Recent roof surveys carried out on three separate but identical 600m²
buildings revealed different conditions within the aged waterproofing systems. Moisture mapping was carried out on each of the roofs and a full cost saving analysis provided the client with the following costings for the refurbishments. The savings outlined below were presented to the client who appreciated the proven works required compared to initial recommendations by others for full replacement of all roofs. In addition to these savings, carrying out an overlay with insulation upgrade
or partial strip with overlay will result in a shorter project time. This will in turn reduce associated project costs such as:
▪ Shorter contract periods ▪ Scaffolding & welfare hire ▪ Equipment hire ▪ Labour costs
CASE STUDY At Woolwich Polytechnic, for example, a moisture mapping survey report was commissioned to three roof areas within the main roof with a total area of 500m². Using a Troxler 3216 Roof Reader, project surveyors were able to measure the moisture concentration within the roof structure to determine the source and extent of the water ingress. The moisture mapping report concluded that the existing single ply insulated waterproofing system contained water to several areas with the addition of some
Using a moisture mapping survey report, a surveyor is able to provide clients with the data gained, proving the extent of the works required and proposals for waterproofing options with correct costings
localised small areas of water within the existing original build-up. This was estimated to be in the region of 30-40 per cent on the first roof section and 25- 35 per cent on the second. The third section of roof contained water to one localised area. After completing the roof survey, recommendations were made that only the
upper roof system required stripping, and with some minimal repair the original roof could be left in situ and overlaid in the usual manor with an upgrade of insulation to comply with the current Part ‘L’ building regulations. Using the moisture mapping gave the client an exact scientific brief on the
roof which led to peace of mind and substantial costs savings on the project. Bauder is an international manufacturer of building construction materials.
50 | HMM December/January 2021 |
www.housingmmonline.co.uk
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