My 10sqm.Conservatory is cold. The floor is tiled and it is about 8cm below the house floor, which is a bit awkward at my age. I don't think the 2 dwarf walls have cavity insulation as I am getting mould on the inside. I have put a small amount of Insulation on the outside walls covered with Shiplap. I was thinking of putting down 50mm Floor insulation, then 18mm T&G OSB Boards, then sheet Vinyl. For the dwarf walls, 10mm insulation & 12mmm Shiplap, painted. A Carpenter says I should put battens down 1st.for the Floor but I wonder if this is necessary. Any ideas .......or suggestions.. please