Installing Assured Hollow Composite Joists
Ideal For Solid Foundations
Composite joists need a solid concrete foundation to fix to. We advice creating a decline of 1% - 1.5% running away from a property acting as a drainage slope. Drainage holes or gutters can be placed in the concrete foundations if needed.
Measure and cut joists where required.
Lay joists into position leaving 300mm max intervals between each joist centre to centre. Leave 10mm expansion gaps close to a property and at joist butt joins.
Fix joists into place by drilling holes through the middle groove of each joist and into the foundation. Start at 80mm approx and then at 500mm approx intervals.
Double joist where deck boards meet at butt joins allowing a 3mm gap between joists.