Vernacular Buildings Roof Pitches and Garage Design:

The quote below from the book “Your House the Outside View” by John Prizeman explains why so many vernacular buildings are characterised by steeply pitched roofs.

“Since roofs are sloped to shed rain, it is quite logical to find that very thin or small sized materials such as thatch have the steepest slopes (up to 75 deg) and the homegeneous materials like metals of roofing felt can be laid practically flat: each material has its own ideal angle. One can easily see how many buildings used to be thatched by the extreme steepness of the roof, although they may now be covered in tiles”.
Oak Framed Garage 4

Vernacular Buildings, Building Spans and Roof Heights:

Historically most vernacular domestic buildings would have spans in the region of 4.5 -5.5 meters. The reason for this was that generally builders were governed by the materials available and that beam lengths in excess of 5.5 meters were rare and reserved for the more expensive properties.

Traditionally pitched roofs with larger span buildings often result in ungainly and out of scale solutions from designers who do not understand the subtleties of traditional design.

The problem faced by designers when designing Garages is that typically a garage should be over 6 meters from front to back. If the designer were to employ a typical steeply pitched vernacular roof the finished height of the roof would become quite excessive.

Our approach to this problem is to maintain the typical span of the main building 4.8m and then employ and cat slide roof providing the extra depth which is necessary to accommodate the full length of the car.

In this way the height and width of the garage sit comfortably within the local environment and tend to relate correctly in massing terms with the existing properties and neighbouring buildings.