For most upper floor framing systems, the critical perimeter structure is left to the end (i.e. blocking and stiffeners). Sure, floor joists go up quickly, which gives the impression that the majority of the floor frame has been completed but it’s just like the old saying; the devil is in the detail. Then come the bits and pieces of blocking, notching, bridging, bracing, trimmers, stiffeners etc. to locate roof and wall loads above and transfer them to lower walls.
Our approach is quite the opposite, because we’ve designed it we know where floor joists need go, where to support and transfer loads from above. We take that information from our CAD software and use it to manufacture the perimeter and internal Smart Bearers. The Boxspan Smart Bearers solve the issues of lateral racking forces on a floor, transfer of wall and roof loads from above by providing an evenly distributed support and therefore not requiring blocking. In most cases it will also do the job of lintels below.
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For plumbing and electrical services, holes up to 114mm in diameter can be cut in Boxspan 200mm and 250mm deep joists using a timber/steel hole saw.
Boxspan upper floor joists range from 150mm to 250mm deep however, the most commonly used and efficient joist size is B200-16 with the same size for perimeter bearers. Where spans are large and structural beams are required to break up the span, Spantec’s design team do all the design work to minimise bulkheads keeping the overall floor depth the same.
With a wide range of beam sizes and brackets, step-downs for balconies are no hassle and you can still enjoy your view. Large cantilevers can also be achieved, see span charts or contact us to determine the right joists for your project.
Nearly all upper floor frames will typically be finished with a ceiling to the underside. It’s common to have some joists running parallel with walls under. In these situations the builder, carpenter, or plasterer will need to add trimmers so the plasterer will have something to fix the ceiling to. Our software highlights these situations and includes simple to use, cut-to-length, ceiling trimmers with each upper floor frame.
With a wide range of beam sizes and brackets, step-downs for balconies are no hassle and you can still enjoy your view. Cantilevers can also be achieved, see span charts or contact us to determine the right joists for your project.