Ecojoist beams consist of parallel stress timber flanges joined together with engineered V-shaped galvanised steel webs. The webs are fixed to the flanges via nailplated zones top and bottom.

How far can it span?

This will depend on the loads, overall depth and width of the joist and the grade of timber used. As a guide, span tables can be found below and on www.eleco.com.

What is the strongback bridging for?

This is to create a "solid" feel to the floor structure by ensuring good load sharing between joists, thus limiting the effects of vibration.

What about fire?

Like all timber based floor systems Ecojoist relies on the plasterboard fixed to its underside for the majority of its fire resistance. Generally speaking, 12mm plasterboard with a skim coat of plaster or artex will provide the modified 30-minute fire resistance required for domestic first floors.

Why is there an opening in the middle of the beam?

The positions of the webs are calculated from the end (or support point) of the joist towards the centre with any discrepancy being taken up in middle bay.

Can I deck the floor at joisting stage, to provide a safe working platform?

Yes, Ecojoists lend themselves ideally for this application, being open web constructed, services can be installed retrospectively, through the open space. (A 195mm deep beam will accommodate a 100mm plastic pipe).

We recommend the use of Proprieter Weatherproofed Flooring - which can be laid at the joisting time and offers the opportunity to build a safe working platform as well as the finished floor in one operation.

Yes Ecojoists out perform most joist systems and when a 253mm deep joist combined with a 36mm Eleco floor panel laid as a floating floor over standard decking, together with 15mm plasterboard below, have test results of 57db and 58db respectively for airborne and impact sound insulation.

Yes, tests prove that 219mm deep Ecojoists when used with 22mm Chipboard decking screwed or nailed to joists together with 15mm Wallboard plasterboard fixed to the underside, offer a sound reduction of 40dB (Rw=40dB).