Does the proposal integrate Eurocodes?

Yes. The Timber Framing/Roofing sector enriches the proposal with Eurocode 5 (timber) or Eurocode 3 (steel) references and DTU 40 series according to roofing material.

Are different roofing materials covered?

Yes. The proposal adapts to the material specified in the CCTP: tiles, slate, zinc, profiled steel, with corresponding DTU and specific installation rules.

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Updated on 6 October 2026

Timber Framing and Roofing Technical Proposal: Structure and Weatherproofing in Public Contracts

Timber framing and roofing contracts combine structural calculation and roofing craftsmanship. The buyer expects a proposal that proves mastery of both dimensions: the structural resistance of the frame (Eurocodes) and the lasting weatherproofing of the roof covering (DTU 40 series).

The market in figures

French public procurement open data, 12 rolling months as of 2026-08-28. Amounts and durations are medians.

3,628: contracts awarded
1,918: winning companies
1,453: active public buyers
129,162 EUR: median amount
13 months: median duration

What these figures tell you

With 1,918 winning companies for 3,628 contracts, a company wins on average 1.9 contract(s) per year in this segment.

The median amount of 129,162 EUR indicates the size of consultation to target first.

The median duration of 13 months shows how often these contracts return to tender.

The median is used rather than the average: a handful of very large contracts is enough to distort an average.

Timber framing: calculations and material traceability

For timber framing, the evaluator verifies the structural calculation to Eurocode 5: permanent loads, imposed loads (snow by zone, wind), load combinations. The proposal must specify timber species and use class (treatment mandatory in class 2 and above), frame type (traditional or industrial trusses NF EN 14250), and timber certification (PEFC, FSC). For steel framing, NF EN 1090 applies with corresponding execution class and welding qualifications.

Roofing: DTUs and critical details

The roofing material choice must comply with the applicable DTU.

Material choice and layout

Depending on material (tiles DTU 40.21-24, slate DTU 40.11, zinc DTU 40.41, profiled steel DTU 40.44), the proposal must specify: product reference, format, minimum admissible pitch, and fixing method. A layout plan showing element arrangement and singular point positions is highly valued.

Critical details and ventilation

80% of leaks originate from critical details. Detail each type: ridge (ventilated or sealed), valleys (metal, zinc), verges, chimney flashings, ventilation outlets. Sub-roof ventilation (air gap, tile vents, ventilated ridge) is essential to prevent condensation.

Flashings and rainwater drainage

Flashings complete the roofing and must not be neglected. Detail gutters, eaves channels, and downpipes: material (zinc, copper, aluminium, PVC), cross-section sized for roof area and local rainfall intensity, fixing method, joints, and thermal expansion. DTU 40.5 governs rainwater drainage works.