In modern architecture, an attic is an upstand of the edge of the roof, which is particularly common in flat roofs. The parapet must be raised to such an extent that the minimum heights specified in the technical rule for waterproofing can be complied with for raising the waterproofing above the surface of the decking. These are:
- for roof pitches up to 5° (flat roof): at least 10 cm
- for roof pitches over 5° (pitched roof): at least 5 cm
For a roof with a circumferential parapet, at least one emergency overflow or drain must be provided in order to be able to rule out a backflow of surface water up to the height of the parapet, for which neither the roof structure (static) nor the waterproofing (pressure case pressing water) is usually designed.
The respective designs of the connections are described in the flat roof guidelines.
Source: bauwion
The most important regulations according to the Flat Roof Directive (point 4.6) and the technical rules for metalwork in the roofing trade:
- The height of roof edgeclosures should be approx. 10 cm above the upper edge of the pavement or gravel fill for roof pitches of up to 5°, and approx. 5 cm for roof pitches of up to 5°. Roof edge closures must be inclined to the roof side so that rainwater can drain inwards.
- The outer leg of covers or edge profiles should overlap the upper edge of plaster or cladding, depending on the height of the building, i.e. up to 8 m > 5 cm. About 8-20m ->8cm. About 20m -> 10cm.
- The protrusion of covers or edge profiles must have a drip edge of at least 2 cm distance from the building parts to be protected.
- Roof edge end profiles and roof edge covers, including their parts and fastenings, must withstand the expected stresses from wind loads. The occurring loads and their calculations are regulated in DIN 1055: Effects on Structures, Sheet 4 .
- Roof edge covers should also have a clear slope to the roof side so that rainwater can drain off with the impurities deposited on the top of the panel.
