Triad Timber Components specialise in the design, production and supply of structural timber components which include Trussed Rafters. What we do. What ever your structural timber engineering need here at Triad Timber we're have you covered from Posi Joist & I-joist Roof and Floor System and Timber Frame Structures. We also supply a full range of associated metal fixings, laminated timber beams and roof stability bracing. To complement the design service, our package includes working drawings and design calculations to meet local authority requirements. Specialised erectors can also be arranged in conjunction with our design service to offer a complete 'supply and fix' service. We are based on the Lancing down on the south coast with a sister company based in Canterbury and are part of the Calldene Group.