Civil Engineering Reference
In-Depth Information
Posi-Strut; this is illustrated in Fig. 6.17 showing a typical joint detail for attic roof con-
struction using the Posi-Strut for floor joist and rafters.
Trimming for openings can be simply done as illustrated in Fig. 6.17. MiTek concentrate
on the production of Posi-Strut with a few of their fabricators who specialise in the
product, investing in the dedicated jigs required, thus making them highly efficient and
improving the cost effectiveness of the component.
One of the initial objections to the use of lattice joists as mentioned above is the spread of
fire through the floor or rafter void. Testing has been done by both Gang-Nail and MiTek
who have developed approved constructions for up to one hour fire resistance for use as
floor joists, thus clearing obstacles from the path of those wishing to specify this relatively
new building product.
