Using MDF in benchwork??

[Anonymous]

I heave read a lot about Homasote, but it is not available within 30 miles of where I live; I have checked extensively. So -- can I use MDF (medium density fibreboard) instead of plywood on top of the underlying framing?

[mcouvillion]

I've got a friend who is planning to use MDF (actually, has started on the lower levels) although I have cautioned him about several concerns. MDF is very heavy (dense). I am concerned that when ballasting or doing other detailing that the moisture will cause the MDF to swell and distort. This distortion will not be minimized when the MDF dries. Since it is rigid over a good distance, there is less likelyhood to have underlying supports, so the necessary wiring will be hanging down, or otherwise not well supported, from the bottom of the MDF. I think the stuff is great for a countertop, but not so hot for a model railroad. I would not use it in place of Homosote for roadbed.

Mark C.

[Big_Boy_4005]

I wouldn't recommend MDF for use on a model railroad. It has 2 basic problems. It isn't designed for horizontal applications, though if you put enough support under it, you might keep it from sagging. The bigger problem is it's ability to hold fasteners. It doesn't do that very well at all.

[Jetrock]

Really? I use MDF for my benchwork, with a framework of 1x2 lumber underneath, and it is solid as heck. I have been told it is not good for cookie-cutter type benchwork, but for solid-tabletop benchwork it is very solid, absorbs sound, and takes nails and screws very readily.