Truss Design

Murdock Roof Truss Design – Newry, Northern Ireland & UK

Trussed rafters remain one of today’s preferred choices of roof construction for domestic housing and are increasingly favoured for commercial and industrial developments such as offices, shops, hotels and leisure centres.

Their popularity is partly thanks to their compatibility with a variety of construction methods including timber frame, masonry, and steel frame. They also benefit from superior flexibility and cost-effectiveness over many other methods of roof construction.

Furthermore, strict design and fabrication standards ensure that trussed rafters are consistently highly-engineered.

Our trussed rafters are manufactured from softwoods strength-graded in accordance with either BS4978, BSEN518, BSEN519 or as recommended in BS5268 : Part 2 and Alpinepunched metal plate timber fasteners which have been fully tested and certified by UK Accreditation Authorities. All trussed rafter designs are prepared in full accord with the relevant British Standard Codes of Practice, notably BS5268 Parts 2 and 3 in the UK and NSAI Standard IS193 in the Republic of Ireland. Designs also fully meet the requirements of the current statutory Building Regulations. Timber for trussed rafters may be protected against biological degradation and insect attack by the use of preservative pre-treatment which Murdock Trusses can offer.

State of the art Software

At Murdocks, we use state of the art Gangnail software by ITW Industry to computer design and engineer our roof trusses for optimal cost effectiveness and turnaround time.

Once trusses are designed and engineered, drawings are sent directly to our saws for fast, accurate cutting to get production underway.

Our use of the Gangnail Software, an ITW Instinct Residential Design System component, makes us “Instinct enabled”. The ITW Instinct suite of compatible construction software eliminates the laborious practice of redrawing the building envelope – typically 5 to 7 times per building design. Architects, designers, engineers, estimators and managers collaborate data to a shared hsbCAD Building Information Model (BIM), keeping all parties up to date with latest revisions. Endorsed by the UK Government, BIM massively improves project coordination, reduces errors, identifies construction safety hazards at the design stage and ultimately saves money!


Roof trusses are compatible with a variety of construction methods including timber frame, masonry and steel frame. The well-established construction method continues to offer superior flexibility and cost effectiveness over many other contemporaries. Strict design and fabrication standards ensure that trussed rafters are consistently highly-engineered.

Offsite manufactured roof structures are erected quickly

Trusses are generally spaced at either 400mm or 600mm centres providing an economic use of timber
Erection procedure is simple and repetitive, requiring a minimum of skilled labour
Architects and developers have a free rein in forming economic roofscapes
Standard designs require only external walls to be load-bearing, eliminating intermediate supports
Waste and pilferage are minimized
Deliveries to suit construction schedules reduce handling and storage costs.

The timber construction of trussed rafters is ideal for the environmentally conscious as timber is the only truly renewable building resource. Timber construction also benefits from higher thermal efficiency than alternative materials such as aluminium, steel, or concrete.