Introduction
A platform floor provides a working platform for the builder as the floor is laid before erecting the wall and roof framing. However, this method is not recommended for feature floors because the flooring is exposed to the weather during construction.
The platform floor should be protected from getting wet by rain and/or wet trades, however, as it is difficult to provide adequate protection, degradation due to the effects of sunlight, wetting or work practices may occur.
Plywood panels are laid with the face grain of the plies at right angles to the line of the supporting joists. They must be continuous over at least two spans. Ends of sheets are butted over joists.
Edges of sheets, unless tongued and grooved, are to be joined over noggings between joists. Noggings are timber of not less than 70 x 35 mm sections. They are set flush with the top of the joists.