I have found the best way to lay this flooring is as follows: 1. As well as screwing the batens (7cm x 7cm) to the floor also place some Sikaflex under the batens before screwing down, this will ensure that they do not move. Place the batens at 40cm intervals.(http://www.castorama.fr/store/CatalogueIndirecte/construction-et-renovation-etancheite-joint--professionnel/p-categorie_7004-casto_product-PRDm931535.htm) 2. When you lay the boards place a couple of blobs of sikaflex on the batten so that the boards rest on this - this acts as a cushion and stops the boards squecking 3. Lay the first row of boards and I have found it is best to screw these in place and fill the screw-holes. 4. For the next row of boards, put the board in position and then knock a chisel into the corner of the baten next to the board, and pull the chisel so that the board is pulled into place and there are no gaps, at the same time bang a nail into the tounge - do this for each baten. This will ensure that the boards are nice and tight - I also use the twisted nails - not sure of name but these are the ones that are difficult to pull out. 5. For finishing them we used a coloured "Lasure" - V3V make and then used two coats of Bondex Professional Vitfricateur - this gives and excellant finish. We also sanded the boards before treating them - I suggest that you get an off cut of boarding and stain one that you have sanded and one that you have not and see which one you prefer. Our floors have been down 2 years and have not shrunk Good luck