Constructie en dakopbouw
Dakconstructie
The roof structure is the assembly of wooden or steel elements that supports the roof and transfers the loads — dead weight, snow, wind, insulation, and roofing — to the underlying walls and ultimately the foundation.
Hoofdgids · 15 min lezenDakkapel constructie: complete uitlegMain types
| Type | Characteristic |
|---|---|
| Rafter roof | Rafters run directly from wall plate to ridge; no load-bearing purlins. |
| Purlin roof | Horizontal purlins form the main load-bearing direction; rafters or boarding lean on them. |
| Truss roof | Complete trusses at a fixed distance; purlins and rafters lean on the trusses. |
| Flat roof | Wooden or concrete floor with a slope and roofing. |
With dormers and ridge raisings, the type of roof structure determines how the intervention is supported. A rafter roof behaves differently than a purlin roof, and the trimmer construction is tailored to this.
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Which roof structures are most common in the Netherlands?
In Dutch residential construction, the purlin roof (purlins run horizontally from facade to facade, roof boarding runs vertically) and the rafter roof (rafters run from wall plate to ridge) dominate. In post-war terraced houses, the purlin roof is the most common.What does a dormer mean for the roof structure?
A dormer places additional load on a specific part of the roof structure. The forces are supported by sleepers on the existing purlins or rafters, and for larger spans by additional trimmer constructions. A structural calculation determines whether reinforcement is needed.Is the roof structure always load-bearing?
The main elements (purlins, rafters, wall plate, ridge purlin) are load-bearing. Roof boarding, tile battens, and counter battens belong to the load-transferring layer towards the load-bearing elements, but do not support the roof plane independently. During a renovation, it is crucial to correctly distinguish load-bearing from non-load-bearing.