Info

proofing/covering layer)

proofing/covering layer)

Fig. 2: Pitched roof with seamless secondary waterproofing/covering layer

(warm deck)

- Loadbearing layer for roof covering

- Ventilation cavity/counter battens

- Sealing layer (secondary waterproofing/covering layer)

- Loadbearing layer for sealing layer (decking)

- Thermal i nsulatior

- Vapour barrier/airtight membrane

- Loadbearing layer for vapour barrier (in this case decking acts as lining)

- Loadbearing construction

- Roof covering/sealing layer (sheet metal)

- Separating layer (e.g. roofing felt)

- Loadbearing layer for roof covering

- Ventilation cavity/loadbearing ribs

- Thermal i nsulation

- Loadbearing construction

- Vapour barrier/airtight membrane

- Loadbearing layer for vapour barrier (in this case decking acts as lining)

- Loadbearing construction

Fig. 1: Pitched roof with secondary waterproofing/covering layer of overlapping sheets

(cold deck)

Fig. 2: Pitched roof with seamless secondary waterproofing/covering layer

(warm deck)

Fig. 3: Pitched roof without secondary waterproofing/covering layer

(cold deck)

Designation of layer

Roof covering

Supporting layer for roof covering

Ventilation cavity (in counter batten layer)

Sealing layer

(secondary waterproofing/covering layer)

Ventilation cavity

(cold deck only)

Thermal insulation

Loadbearing construction Airtight membrane, vapour barrier

Lining

Function

- Protection against the weather (rain, hail, snow)

- Protection against fire

- Reflection (solar radiation) Arrangement of the roof surface (on plan)

Battens or decking for fixing the roof covering

- Ventilation of roof covering

- Ventilation of timber battens (keeping them dry)

- Dissipation of air heated up by solar radiation in summer (primarily a problem with dark roof coverings)

Protection against soiling (dust, soot, drifting snow, wind)

Protection for layers underneath (thermal insulation)

Draining of water that has penetrated an overlapping roof covering (ponding)

Temporary protection to structural shell during construction until roof is completed

- Dissipation of any external moisture that may have penetrated the secondary waterproofing/covering layer

- Dissipation of warm, moist internal air in winter (prevention of condensation) Dissipation of air heated up by solar radiation in summer

- Protection against or delay of cooling in winter and temperature rise in summer Insulation can be laid above, below or between loadbearing members (problem: sealing of joints with rafters)

Carries dead and imposed loads (snow, wind, etc.)

Protection against uncontrolled ventilation losses in the voids above and the associated condensation

- Protection against warm, moist interior air diffusing into the roof construction Protection against formation of condensation in cooler zones

- Termination of internal space, inner surface to roof voic Protection against surface condensation (moisture buffer)

- Stores internal heat (avoids "stuffy" climate)

Materials, thicknesses

- Clay or concrete roof tiles, slates, fibre-cement, sheet metal (approx. 2-40 mm)

- Roof battens, 24 x 48 mm (primarily for all small-format roof coverings), spacing approx. 15-30 cm, depending on roof covering

- Timber decking, 27 mm (primarily for thin, sheet-like roof coverings)

Counter battens,

24 x 48, 48 x 48 or 60 x 60 mm spacing approx. 60 cm

- Bituminous felt, 3 mm, on 27 mm timber decking

- Special plastic sheeting, vapour-permeable, 0.2 mm, on 27 mm timber decking

- Fibre-cement sheets, approx. 4 mm, laid with overlaps

- Timber boards, 6-24 mm (waterproof hardboard)

min. 40 mm or as calculated

- Mineral wool, foam plastic (PU + PS), min. 120 mm or as calculatec

Timber, steel, reinforced concrete, cross-section according to structural analysis

PE and PVC sheeting, kraft papers, approx. 0.2 mm - PE and PVC sheeting, aluminium foil, approx. 0.2 mm

Timber

Gypsum (plasterboard) Wood-based materials Plastered

Wood-cement boards - Wood panelling

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