Doug Murphy 'We few, we happy few, we band of brothers...' Henry V.
My around-the-walls layout is in sections bolted together with back-to-back corner braces under the table. The PVC-pipe legs come off with a single nut each. The wiring connects through Molex connectors. All the detail is in the corner sections--The side sections are straight track, which can be shortened or lengthened to fit other room sizes.
When we moved into our present house, I had the layout fully assembled before we discovered a problem with the floor in the train room. I was able to get the whole thing stacked on its edges in the adjacent living room in a couple of hours, and back together just as easily after the repairs.
The table is just half-inch (15/32) BC plywood, with steel angles bolted to the bottom, and legs where needed, but strong enough for me (250 pounds) to climb on.
Bob Nelson
If it were me, I would protect the carpet by laying treated firring strips down on the concrete slab and lay subfloor over them (1/2" OSB plywood works fine if the firring strips are 12" on center) followed by carpet. Home centers carry an alternative to firring strips and plywood. They are panels that look like egg crates under neath. Either way, water drains to a sump or floor drain without wetting the carpet. It's not a good idea to lay carpet over a basement slab anyway. It gets damp and mildewed.
chuck wrote:I am considering taking this one step further for the layout. Use a lightweight but rigid assembly for the table top (possibly a extruded foam and luan sandwhich).
I made a Christmas layout (4ft x 5ft) to serve as layout and tree base. Wanted it light for a change. As an experiment, built a frame of 1x3 lumber, then glued 1.5" blue foam inside the frame, flush with the frame bottom. The latter step was taken in case the foam wasn't strong enough to support the weight of the tree - this way the weight was transferred to the floor. I then glued 1/4" luaun plywood on top of the foam so the track and accessory screws had something to bite into. Note that the scale train guys usually put the plywood (if they use plywood) under the foam. Painted the frame and plywood a Christmas green. Used pillow stuffing polyfoam for snow. Modified the track design several times over a 3 year period for different accessories, a trolley, etc.
This benchwork and layout design was far more successful than I ever dreamed. I could easily carry it and transport the thing myself. Only difficulty with handling it by myself was in a strong wind. I expected limited holding of screws because of the thin plywood, but nothing ever fell off or came loose when the layout was stood against the wall in the basement when the layout was not in use. Loaded the thing in my Explorer (had to ride on its edges on the wheel humps), and set it up at work on top of cabinets in my cube as a Christmas display - it was the hit of the engineering dept. The layout didn't care where it was supported - under the foam, under the frame. It just worked and stayed rigid without any sags. Will definitely use this construction again.
When you start construction of a permanent layout also remember to "look up". Keep in mind that you may need to access something over the layout at some future data (like a cut off valve).
Very good advice!
my thoughts, your choices
Fred W
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