Boarshurst Lofts

HomeStructural Conversion 

Truss Roofs and Lofts

Converting "W" Truss Roofs into Fabulous Loft Conversions

A truss roof has W shaped wooden trusses that carry direct loads through diagonal bracing and tie batons that support and tie the loft floor/ceilings and the roof.

The system of prefabricating trusses was introduced during the war years to preserve timber and is still used today.

Their disadvantage is that the timber frame occupies the entire roof space, preventing anything but basic storage use.

During conversion we replace this system and open up the roof for habitable use.

Recent Examples

Trussed Roof Conversion

There are many techniques for converting a trussed roof. The most suitable will depend, for example, on the internal height of the roof.

As many modern trussed roofs are shallow - taking advantage of materials technology - often they need to be raised. As specialists in the field we rarely experience difficulty obtaining Planning Permission for a conversion.

Internal Roof Height

If your internal roof height is 1.9 metres (the distance between loft floor and roof) you may not need to change to the ridge line (height) of your roof.

If not, then you may need to consider raising your roof line. We are experienced truss attic and loft conversion specialists and have the skills and techniques required to plan and design a new loft from an existing trussed roof.

Attic Trusses

Our most favoured conversion technique is to replace the entire roof using A shaped wooden attic trusses. For a fuller explanation and photographed examples we a page about how we achieve the Structural Conversion within a single day.

This method ensures the integrity of the house remains intact and the house is weather tight within a short period of time.

More on Trussed Roofs

Trussed rafters are manufactured from strength graded timber to individual designs.

Their popularity lies in the generally cheaper materials and production cost over traditional roofing methods, they are relatively quick to manufacture, very flexible to designs and are simple to install.

Trussed rafters are generally built to conventional designs from 3-inch timbers are locked together into a strong, load baring truss frame. Rectangular metal nail-plates (helping to identify the prefabricated trusses) secure the timbers.

Many modern (Post 1965) trussed roof designs tend to have shallow pitched styles and do not have the height required for conversion - 1.8 m minimum at the edge of a stair with 1.9 m at the centre line if the ceiling is sloping.

Room in Roof Trusses

The use of RiR or Attic truss in construction is growing. This growth is driven by the price of land, which makes building up more economical than using larger plots for the same number of rooms. Now accounting for over a quarter of all trusses, they are often used in truss loft conversions.

At Truss Form Ltd. (part of Alpine Automation (U.K) Ltd. - a Truss Design Software Company - for example, timbers are locked in positioned with electric vices and connector plates (Gang Nails) are mechanically pressed into them to create the structure.

Prefab Attic Trusses
Attic Trusses

Prefabricated Attic Trusses
Prefab Attic Trusses

Truss Roof Timber Frame
Standard W Truss Frames

Gang Nailed Wood Timbers in Truss Roof Frame
Gang Nails

Top Top Home Structural Conversion

Transform wasted space

A Modern Trussed Roof

↓ into ↓

Converted Roof

2 bedrooms & bathroom