Beams and floor joists

Today work started on the ground floor. A central beam made in three parts spans the centre of the house and joists span from the beam to the front and back walls of the house. The only problem was that the central beam was too short, the company supplying it made a mistake. They also did not deliver the joist hangers that allow the joists to attach to the beam. So at the moment we have five guys working on the job for as long as they can and hopefully the correct beam will be delivered soon. Once the beam and joists are assembled we can put down the plywood to make the sub-floor, and then we will cover it over with a tarpaulin and leave everything until Spring. The race is on to get the floor done as there is another 20cm of snow forecast for this Sunday (today is Friday). All of this work is being done with an outside temperature of -18C!