and foundations on lower storeys. However, if load bearing walls already exist or can be added easily, they can provide additional sup- port to the trusses. In order to be most effective, the room space should be placed within the cen- tre 20 per cent of the truss span and near the mid-span of the truss, which allows for greater room sizes. One of the biggest advantages of using attic
trusses to create room in the roof is the speed of build, as the trusses are factory-built and deliv- ered to site ready for swift erection. Roofing a house using attic trusses can be up to five times faster than using a cut roof method. Plus, as the trusses are manufactured off-site in a controlled environment, high quality is guaranteed. In terms of transporting the trusses from factory to site, an overall truss height of 4m is generally accepted as easy to transport. If the height of the truss must be greater than 4m, it can be constructed in two parts and simply joined on site. The increased speed of build offers not only reduced labour costs, but also creates a weather-tight shell around the build area faster. And, because a complete structure is available sooner, roof finishes, plaster board and floor- boarding can be installed immediately, further reducing build time and costs on site. There is also scope to incorporate further ben-
efits to the attic truss system. By combining the trusses with another engineered wood compo- nent, open web joists (Posi joists), electrical and plumbing service are easily accommodated or modified, which gives the homeowner the ability
to easily change internal wall positions along with plugs, sockets and radiators at any point in the future. Attic trusses can be supplied with an open web joist bottom chord, which allows serv- ices to be run through the floor joists without the need for costly cutting and drilling, and also give the option to incorporate modern ventilation and heat recycling systems.
Leaving the option for room-in-the-roof is a valuable solution and one that ensures a lasting legacy for new houses. For a little extra initial outlay, the option of more room in the roof adds extra value to the building. Its practicality, flexi- bility and ease of installation make it an attrac- tive prospect and one that will only continue to grow in popularity.
Enq. 195
Handmade furniture using stunning redundant railway sleepers from around the world
Enq. 196 Enq. 197
selfbuilder & homemaker
www.sbhonline.co.uk
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