Traditional roof design


Traditional roof design


Traditional roof design

Traditional roofs are also called ‘cut’ roofs.  If you need a traditional roof design we can supply all the necessary structural calculations.    Most modern roofs are constructed with trussed rafters. There are different types of trussed rafters but the most common ones are fink trusses and attic trusses.  The main advantage of trussed rafters is they can be made off-site and erected on-site with unskilled labour.  They are not normally much cheaper to build than cut roofs.  However, whilst constructing a traditional cut roof is a much more skilled job, it can also provide much more useable space inside the loft.

Fink trussed rafters use small timber sections to form a series of trusses.  But because of all the truss bracing, the inside of the loft is not very  useable.  Attic trusses don’t have any internal bracing and therefore they leave more useful space, but they are also much heavier and costly as a result.

Sometimes customers want a traditional roof design because they have future plans to convert the roof space.  Sometimes a design is needed for a new roof to an older property.

Traditional roofs normally benefit from internal supporting walls. The roof design is varies depending on whether the roof is ridged or hipped.  Shallow hipped roof pitches also need a different type of design because the hip rafters need to be designed as beams and they also need vertical support at both the top and bottom.

We need the following information to design a traditional roof

architectural layouts and elevations or sketch drawings with dimensions

the position of any internal loadbearing walls

the intended use and possible future use of the loft

the height of the roof

the type of roof covering

the approximate location of the building

Design information

All design work is carried out in accordance with BS5268

The calculations provided will be suitable for Building Regulation approval.