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David's extension |
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Description: Elements: Bauder expanded polystyrene insulating reservoir boards (£11/m2). 1200g polythene root barrier membrane 50mm extruded polystyrene insulation 2 layers polyester fibre reinforced bituminous roofing felt 18mm external grade plywood laid to 1:40 falls 250 x 50 tanalised FSC softwood joists Single 75mm roof outlet to internal downpipe draining to stone filled soakaway pit. Summer irrigation is by a redirected roof downpipe and bath/shower-water drainage stack Lessons learned included that a 150mm soil layer is too shallow and needs to be watered during extended periods of hot dry weather. Also cutting grass too early in season inhibits the regermination of less hardy flowers, while- cutting grass too late in season leaves roof looking bare through the winter Location: Sheffield, S8
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