Construction details
5 Roof for foot traffic
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5.1 Roof edge without overhang • Waterproofing above insulation • Bitumen waterproofing
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A protective membrane over the waterproofing is necessary because of the bedding of angular (i.e. sharp) chippings for the stone flags. A sheet metal skirting protects the bitumen flexible sheeting at the parapet. It is easy to offset the joints in the insulation on the roof surface: simply lay the lower layer of insulation up to the inside face of the concrete parapet and start the upper layer of insulation from the face of the vertical insulation to the inside of the parapet. This method is suggested in the Flat Roof Directive.
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5.2 Roof edge with overhang • Balustrade • Waterproofing below insulation • Synthetic waterproofing
If the thermal insulation is incompatible with the synthetic waterproofing material, then a separating membrane must be laid between the two. The balustrade in this detail consists of laminated safety glass spanning between steel plates connected to the precast concrete coping. The insulated joint between the roof slab and the cantilevering section requires a stable cover to support the materials above. A screed laid to falls is necessary on the roof slab.
5.1
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Stone flags Chippings Protective membrane Bitumen waterproofing, 2-ply Rigid plastic foam board Vapour barrier Primer Reinforced concrete Parapet capping Sheet metal clip Bitumen waterproofing, 2-ply Timber board Rigid plastic foam board Clamping bar Sheet metal skirting Trapezoidal profile metal cladding Facing Mineral fibre board
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Concrete flags Chippings Filter fleece Extruded polystyrene (XPS) board Separating membrane Synthetic waterproofing Protective membrane Screed laid to falls Extruded polystyrene (XPS) board Extruded polystyrene (XPS) board Laminated safety glass Sheet metal sill Precast concrete coping Trapezoidal profile metal cladding Linear fixing Bridging plate
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12 5.2