Today, Uli and I put in the underfloor insulation and got started on the OSB boards for the floor. The carpenters had put already fixed light boards about 20cm down from the top of the joists. The light boards ran parallel with the joists. The idea was that the 20cm insulation would rest on those boards and so would not fall down into the arches. On the photo you can see the light boards running between the joists. The boards are treated so there should hopefully be no problem with woodworm.
From 09:00 in the morning (of 26th January (2013)) we measured and cut insulation to size. The insulation is 035 20cm fibreglass wool. I opted for the cheaper variety which does not have a foil on either surface (the idea of the foil being that it is easier to press the insulation between rafters and have it stay there). Cutting the insulation was relatively easy and the floor area was done by about 12:30. You can see from the picture that the insulation is (almost) flush with the top of the joists.
Once the insulation was finished (we had only half a roll left over, so the calculation of how much we needed worked out quite well) we started work on the OSB boards. These were on a trailer in the yard and needed to be handed up and lifted across the floor. We decided to start in the back corner (the north west corner, so to speak). The first row (675mm x 2500mm) needed to have three slots cut for roof props. The OSB boards have a tongue and groove cut into them. We glued the top of each tongue, to try to make sure that the entire floor is a vapour proof level. We managed to get in two and half rows by 17:00. The rest of the floor will (hopefully) be faster, as we won't have to do much cutting.
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