Home Applications Lattice Floor Joists

Lattice Floor Joists

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The lattice truss is a cost effective way of spanning larger areas and the truss depth can be varied to achieve different spans.

Howick’s Truss System offers a floor truss with greater spans and lighter weight than the timber alternatives and can be produced on a just in time basis.

The H400 system allows for greater spans with thinner material than the equivalent joist made using a standard framing profile.

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Indicative Truss Spans

 

Depth (mm)

Centres (mm)

Section
Thickness (mm)

Total Load

Span (m)

 

225

400

1mm

2KN

7.09

250

400

1mm

2KN

7.47

300

400

1mm

2KN

8.19

 

225

600

1mm

2KN

5.79

250

600

1mm

2KN

6.10

300

600

1mm

2KN

6.46

Advantages of Lattice Joist System

  • Light Weight.
  • Dimensionally accurate.
  • Fits standard Brackets and ties.
  • Can be doubled up for longer spans.
  • Riveted Joint allows for bolted attachments.
  • Howick's Rivet is equivalent to 5 standard screws.
  • The triple section connection (right) reduces the number of fixings and also increases the capacity of the joist
  • Very efficient use of Steel*
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*The amount of Steel used to construct a Lattice Floor Joist only marginally increases as the joist depth becomes greater.
Generally only the extra height of the joist (x2) is the actual extra steel used and the number of fastenings actually reduce as less diagonal webs are used.

This means very large gains in strength can be made with no increase in weight or cost.

 
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