Suspended Timber Joist Floor

Timber joist floors have no thermal mass, for best results with UFH a small amount (25mm thick) of weak sand and cement can be laid between the battens to surround the UFH pipes. The sand and cement should be up flush with the top of the battens to ensure good contact with the underside of the flooring panels. It is essential that a rigid insulation board (not glass wool) be used to insulate hard up the underside of the plywood (see diagram). Using this method the floor is raised by 34mm higher than it would have normally been and adds approximately 25kg/m² in weight.

Make up the floor construction as per the floor section to batten level. Follow the diagram as per the fitting of the battens,(see page 16) please ensure that 25x50 battens are used and not 2"x1"’s.

Clip pipes using the plastic and nail hammer clips provided, following the CAD drawing layout.

Before closing the floor down ensure the pipes are pressure tested and that any remaining moisture has been given time to come out of the weak dry sand and cement mix.

Also ensure that the sand and cement mix is flush with the top of the battens, top up if necessary