Boxspan Upper Floor Frames

On Steel Frames

On Timber Frames

On Steel Beams

Traditional approach

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.

Boxspan approach

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.

Dealing with services

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.

Connecting to Structural Beams

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.

Balconies & Cantilevers

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.

Don’t forget the small stuff

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.

CEILING TRIMMERS