Roofing – Projects and Qualified Teams

Roofing is one of the most demanding construction trades: any defect in the roof skin leads to water damage, mould, and costly remediation. The trade covers pitched roofs with tile, concrete, slate, or metal, flat-roof waterproofing with bitumen, synthetic membranes, or liquid-applied systems, roof window installation, between-rafter or above-rafter insulation, and all junctions, penetrations, and proper drainage. Energy retrofits of existing roofs and on-roof preparation for photovoltaics also belong here. Example Germany: the ZDB rules of the German Roofers' Trade Association apply, alongside DIN 1986 for drainage and DIN 4108 for thermal protection. Fall protection follows DIN 4426.

FAQ

How much does roofing cost per m² as subcontracted work?

Which covering suits which roof?

Which insulation is standard today?

What are the most common defects?

How long does covering a single-family house take?

Which safety rules apply to roofing?

How much does roofing cost per m² as subcontracted work?: Example Germany: pitched roof with clay tiles 50–90 €/m² incl. counter and tile battens, concrete tile 40–75 €/m², slate 100–180 €/m², flat roof with bitumen 35–60 €/m². In Poland typically 30–40 % below German rates.
Which covering suits which roof?: Clay and concrete tiles for standard residential builds from 22° pitch. Slate and shingles from 25°, often heritage. Fibre-cement panels for industrial and agricultural buildings. Flat roofs with bitumen or EPDM/PVC membranes below 7°. Metal (zinc, copper, steel) for modern architecture.
Which insulation is standard today?: Example Germany: above-rafter insulation 18–24 cm PIR or mineral wool in renovations, between-rafter 16–22 cm where the truss is intact. Per GEG 2024, U ≤ 0.20 W/(m²K) is required. Vapour-open assemblies with underlay membrane and vapour brake are preferred.
What are the most common defects?: Leaks at chimney, roof window, and dormer junctions; frost damage to old clay tiles; failures from missing ventilation; blocked gutters and downpipes causing water damage; defective membrane bonding on flat roofs. Inspection interval: every 2–3 years.
How long does covering a single-family house take?: Full pitched roof 150–200 m² with counter battens, underlay, covering, roof windows, and flashing: 5–8 working days for an experienced three-person team. With insulation an additional 2–3 days. Weather-dependent – pauses during rain or frost.
Which safety rules apply to roofing?: Example Germany: from a fall height of 3.00 m fall protection is mandatory (DIN 4426, DGUV 201-001). In practice: safety scaffolding or PPE with anchor points. Collective protection takes precedence over PPE. A roof safety net wall is standard for pitched roofs.

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