Originally Posted by maccus

The flooring in the 109 is a interesting program. I am in the process of replacing one. Power washing is a good way to clean the inside walls. But I know on my 109 the reason the flooring was toast was due to the fact that it has no way to drain any water the gets into the inside of the box. There are no drains at all in the steel sheeting under the wooden flooring. And it is water tight. So whatever water gets into the box must just dry by evaporation. I do not know maybe they added drains at a later date but as I said my unit has no drains at all. When I removed the under floor metal the top under the wood was a total rusty mess but the underside of the same metal was perfect. You can bet when I lay down the new flooring it will have drains built in. Today I will be laying down the first layer of new flooring. In the first picture you can see the under wood flooring tin that I took out. Notice that the piece to the left with the undercoating on it is in good shape. While the larger piece that it is sitting on is actually a scaly rusty mess as it is the top side of the same under wood tin. The second picture is how the floor area looks now before I add some 3/4 inch marine/green treated plywood today. Then on top of the 3/4 inch ply goes 1 1/2 inch of high density foam (routed out to compensate for the fact that the wheel wells will be about 1/4 inch higher than the 3/4 ply). And on top of that will go a 1/2 inch of regular plywood and carpet on top of that. Yes I live in cold country and want to use the unit in the winter.