Boxspan® Steel Joists for Upper Floor Frames

Boxspan® Upper Floor Frames

Upper Storey Floors – Will take the bounce out of your life
Boxspan upper floor frames are suitable for use in steel or timber framed homes. As well as the same benefits of ground floors, joists for upper floors give the builder or owner builder a strong advantage:

Long-spanning Boxspan reduces the need for structural beams to break spans
200mm and 250mm floor joists used with low profile floor traps will save brick work
Passing up Boxspan joists to upper floors is a lot lighter than timber
Long spans without blocking leave a tidy finish for exposed joists and reduce labour
Easy connections to structural steel columns and beams
Boxspan floor frames are supplied as a complete, fully designed system to strict deflection criteria
Boxspan can reach similar span for less depth than timber, solving head height issues

Boxspan upper floor joists on steel frames	Boxspan upper floor joists on timber frames

Upper floor system
Similar to the two ground floor systems Boxspan upper floor joists can use the ring beam system or alternatively use the CBA (continuous blocking angle). Boxspan joists used for upper floors range from 150mm to 250mm deep however, the most commonly used and efficient joist size is B200x50-16 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 make allowances to minimise bulkheads keeping the overall floor depth the same.

Design Corner

Typical Connection Details

Ring Beam Inline upper floor
Joist connecting into perimeter bearer.

Load-bearing end cap with CBA
Joist over frame 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. Soon the 200mm and 250mm deep joists will be pre-punched with 125mm and 140mm service holes.

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. Cantilevers can also be achieved, see span charts or contact us to determine the right joists for your project.