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MDF
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I'm building a 9x17 S scale layout using 3/4" MDF as subroadbed. I have L-girders (1x2 on 1x4) supporting 1x4 joists. The MDF attaches to that. I'm using sheetrock screws for all the assembly and so far have had no problems with anything. <br /> <br />I was concerned with the many negative comments I've read here and in other talk groups about the lack of strength and bowing so I placed my joists on 14" centers when possible rather than the 18" I've used in the past with 1/2 B-C plywood. <br /> <br />Another concern I've heard was with humidity and moisture problems. Just to be sure I coated mine with MinWax polyurethane just to seal it. I live in Scum City (that's Houston to some) and it's much more than humid here. Hopefully that will alleviate any problems with humidity and the plaster and scenery water/glue. <br /> <br />I don't see why it wouldn't be acceptable for cookie cutter layouts. It seems to cut very easily and I've been able to change elevations with little difficulty. I've only lowered and raised some spur tracks but haven't had problems there either. <br /> <br />I can say that it is very heavy, extremely smooth and straight, cuts easily, makes more dust than cutting homasote and is 1/2 the price of plywood. Unless things seriously change in the future with this layout I'll be using it on the next one too and any expansion on this one. <br /> <br />The quality and price of the B-C plywood at the local stores made me decide to use the MDF. I couldn't find any quality plywood here. It was all severely warped, had large voids in the layers showing from the sides and the huge knotholes were either not filled or poorly filled. <br /> <br />Strange about the size being 1" larger in both directions though! <br /> <br />Good luck with your layout. <br />Roger
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