Sub Flooring and Levelling Work Books

Today we stayed in the class throughout the duration of the day as it was quite hot outside, and it was better to get some paper work out of the way. During the morning we started on the setting out and levelling work book, basically filling in missing words. The book talked about different types of levelling devices such as the spirit level, dumpy level and laser levels.
Next we moved onto Australian building standards for sub floors. This talked about the different types of joining bearers over the top of studs, such as butt joints and vertical scarf joints. Also i learnt about cantilevering with the studs where a stud can be placed 25% of the maximum stud span, in from the edge of the structure. Joists that sit ontop of the bearers, running perpendicular, can also be housed out but only a quarter of the entire width of the joist.
I learnt that floors have to have 10mm spacings around the edge next to the wall, to allow for expansion of the wooden floor in different weather conditions. Two joists must be placed directly underneath where a wall will placed, to make it stronger, but the inside joist must have at least 12mm of overhang so that the floor can sit on the joist around the entire edge of the room.
I found the excersise when we were set three problems solving the lengths of timber we would need to adequately make a small room, quite fun as we could just sit down and nut it out ourselves but also be able to talk to each other about how we figured the problem out and what answers we came up with. Most of this time was quiet and just cruised along nicely.