The design and engineering of trussed rafter roofs allows cost-effective and rapid construction of almost any roof-scape. A wide variety of truss rafter profile types have evolved to solve almost every building design requirement. Comprehensive roof layout drawings and details are tailored to the exact requirements of individual projects. The wide variety trussed rafter types offer more economic solutions than traditional framing methods. Complex roof structures such as hips can be modelled, tested and manufactured from the minimal material required.
There are a number of truss rafter profiles or configurations which have been adopted as common or standard. For example the most frequently used is the fink roof truss recognised by its distinctive W-shaped internal web pattern. Over a significant range of spans the fink roof truss configuration is the most cost effective.
Other truss rafter profiles can offer greater load bearing capacity, vaulted ceilings and even dual pitched roof lines. Here are a selection of some of our other popular truss configurations:
- King Post Truss
- Queen post Truss
- Fink Roof Truss
- Howe roof Truss
- Fan Truss
- Raised Collar Truss
- Double Pitch Truss
- Cantilever Truss
These common roof truss profiles offer tremendous possibilities; spanning longer than conventional framing without support. This means you have more open space to work with or the freedom to place internal walls. Variations of the fink roof truss and fan truss can span over 80ft.
The Adaptable Roof Truss
Raised collar trusses offer the possibility of vaulted ceilings and can push room space up into the otherwise wasted roof void. You can add roof-lights and dormer style windows. If you are looking for a feature ceiling or to gain extra headroom, you might like to also consider the following:
Information Required By the Trussed Rafter Designer
To begin the roof design process the building designer will need to have considered and provide the following details:
- The height and location of the building, with particular reference to any unusual wind conditions.
- The external external profile of the trussed rafter, including any allowances required for tolerances.
- The span of the trussed rafter.
- The pitch or pitches of the roof.
- Drawings showing fire walls, the position and type of support, roof shapes and special requirements.
- The type and weights of roof tiles or covering, including sarking, insulation and ceiling materials
- Thee size and position of any water tanks to be supported on the trussed rafters
- The overhang of rafters at eaves and other eaves details.
- The position and dimensions of hatches, chimneys and other openings.
- The service use of the building with reference to any unusual environmental conditions and if required, the type of preservative treatment.
- The spacing of the trussed rafters and special timber sizes where these are required to match existing construction.
- The load per square metre to b allowed for services and the proposed support method if applicable.
- The type, position, load and method of support for any plant, fittings, partitions etc suported by the trussed rafters.
The building designer should ensure that the design of the roof as a whole and its compatibility with the supporting structure are satisfactory and meet their requirements.
Melingoed offer a full free design service, so get your project underway today.