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Author Topic: using Dow Blue extruded polystyrene foam  (Read 1357 times)
RAM

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« on: May 16, 2007, 11:56:25 PM »

I have never used Dow Blue extruded polystyrene foam.  I want to use it for part of my upperl level.  This will be either 12 or 16 inches wide.  I have one sheet of 1 inch and two sheets of 1/2 inch.  I was wondering if it would work to make a fram of 1 by 1s with 1/4 inch plywood. then put the foam in that.  Do you mount the raodbed right on top of the foam or do you need a sub roadbed.
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brad

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« Reply #1 on: May 17, 2007, 12:48:08 AM »

I used 2 inch foam board for my entire layout with only "L" backets every 16-24 inches and have had no problems. I didn't use a sub roadbed, I merely carved roadbed and ditch profiles into the foam and find it no more noisey than my last layout with a  plywood/homosote/cork sub structure.  Your frame of 1X1's and 1/4 inch plywood should be strong enough, although, I would be tempted to make the 1X1 frame out of 3/4 inch plywood as it is more stable than dimentional lumber and less likely to twist, especially with that small of wood.

brad
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I drempt, I planned, I'm building
RAM

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« Reply #2 on: May 17, 2007, 12:29:13 PM »

correct. the foam is 1 1/2 inch and 3/4 inch.  instead of 1 inch and 1/2 inch.
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