How to frame this?


Toot you make it out that I need to build a battleship layout. 3/4 ply is heavy! I suppos it wouldn't warp as badly if at all.
You did say a "sure fire way". Can't get much more sure fire than a Battleship. What makes the real difference in plywoods are the number of plies themselves, i.e. 5 is better than 3 and 7 is better than 5, so on and so on. As is the hardness of the wood the plies are cut from.. Plywood is very much favored in the US as bracing on stick frame houses and is probably more weather and damp proof. Usually doesn't have a really smooth finish, but that's not so important and you can sand it somewhat if you want. Personally, I wouldn't go below 5 ply.
 
Just throwing this out there.....could you eliminate some of the material susceptible to warpage, like the plywood? Open grid bench work supports rigid foam nicely. That was the method I used on my first layout, 2" rigid foam on 1"x4" select pine lumber open grid bench work. Any expansion/contraction issues resulted in the foam joints moving horizontally, didn't have a problem with any vertical movement.
 
I had wanted to purchase all the materials today before the storm hit. With current prices of lumber I was afraid to invest that much for fears of it all warping again. Is there a sure fire way to avoid warping? Is it something I'm going to have to learn to deal with?
Where there is excessive moisture, there is warping, however there can be other contributing factors.

Warping can be minimized with relatively stable temp and humidity.

Dave LASM
 
Just throwing this out there.....could you eliminate some of the material susceptible to warpage, like the plywood? Open grid bench work supports rigid foam nicely. That was the method I used on my first layout, 2" rigid foam on 1"x4" select pine lumber open grid bench work. Any expansion/contraction issues resulted in the foam joints moving horizontally, didn't have a problem with any vertical movement.
I have considered using foam. I wasn't sure of it's advantages over plywood or what the issues would be if I used it.
 
Since you are going to make it 'open grid' benchwork, do you plan on having risers supporting jig sawed sub-roadbed ply attached to it ?
Or are you planning a flat table ? Because, in the end, if you go flat table, you don't need 'busy' open grid style benchwork.
 
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Since you are going to make it 'open grid' benchwork, do you plan on having risers supporting jig sawed sub-roadbed ply attached to it ?
Or are you planning a flat table ? Because, in the end, if you go flat table, you don't need open grid style benchwork...
Ok so out of curiosity if I were to do a flat table what style bench work should I use? L girder? I do have a jigsaw so sub roadbed is an option.
 
No. What I mean is,
if you are reporting that it will be a flat table, open grid and 'L girder' is too busy for that simplicity of bench..You only need simple stringers and cross-members covered with a top like a ping pong table or work bench would have..You don't need all the smaller boxes..just a simple frame and legs..
With that said, 'open grid' is the better way to go about a MRR because it consists of certain needed angles and risers supporting 4" wide sub-roadbed of usually jigsawed 0.5" 5 ply plywood atop risers of same and varied heights for grades, leaving big open spaces to be filled in with scenery..
You can also stand up in the middle of it to do work before, or to do, scenery, preventing your having to reach across a table top to do it...
The advantage of this is, after roads, hills, the track running under it can be reached from below bench to rescue troubled trains or amending track problems in tunnels..A flat table prevents this and also inhibits the scenery from going below track level..
If this appeals to you I'd suggest you YouTube "Open grid model RR benchwork" ... I'm betting members here will post pics of their's as well...
 
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I am not a fan of garages for layouts as my 1st one after college was in one. Boy, in Chicago weather conditions that was a dumb move on my part. However, because you are going to build in one, here is what I would do. For framing buy quality 1x3’s or 1x4’s or cut the same from 1/2 sanded plywood. Either paint or preferably seal coat them with a lacquer. For the top, 2” thick insulating foam either the pink or blue stuff glued with Liquid Nails for Projects. Foam doesn’t expand or contract in hot or cold weather. The framing because it will be sealed should not be affected.

Steel framing might still be a bit higher priced then wood at this time because at least in my area lumber has come down a bit. The problem I am told with steel/aluminum framing is the lack of experience using it. Another issue is tools. Different saw blades, cutting snips Have fun.
 
I find that 48" at my age is ok. My current layout is 36". I work on it just fine. Then again I'm young still as well. Now I use 1/2 plywood as well. That's what I used for my current layout. The previous layout was 3/8. It warped to the point I couldn't run my trains anymore. So I upgraded. I had thought we had a conversation about my current layout in regards to it's location and the conditions it in. My layout resides in my garage. So it falls victim to all sorts of conditions. Even though I have air vents in the garage to help with temperature it's still gets rather cold in the winter and hot in the summer. I blame my current issues on the shoddy 2x4s I used for the sides. I went against my better judgement. Looking at other layout bench work in all the books I have and they all use 1x4s for the framework. After looking at my warp spots. None of them seem to be caused by the 1x4s I used. Then again I may be missing something as well. I re-used 1x4s from the last layout. This go around I plan to use all un-used lumber. Rule out any concerns with my current lumber. So that's where I'm at.
I read your thread a couple times and I think you have fully addressed the warping issue with the foam. However, if your plywood base bowed, it would take an edgewise glued 1 x 4" or similar. Still, if you have humidity issues you might be fighting that perennially.

The 1 x 4's should be straight grained and large knots should not be present.

My new layout is at 48" and I am just starting to lay down the track. I use sheathing as the base, which is set about 1" below grade of my key features. So, I lay out the plywood and build above it for the most part. It makes a good workbase and I can go up a lot.

I do not like foam at all because it feels "weak" to me. A totally personal feeling.

I go about it somewhat backwards in that I start with my surface, which in this case is 7/16" OSB. I cut out the size I need outdoors and reinforce it outside as well, then bring in to the train room and assemble. I just kind of keep reinforcing it until it is strong enough. This doesn't work for everyone.

This layout in progress is 48" in height. The room is 8':

IMG_1907.JPG


To enter you duckunder where I am standing taking the picture. Door is closet, cut out to access. With a more open bottom, access is a breeze for even a 64 year old.

My legs are 2-2x4 screwed together.

I await your progress, Dave LASM
 
I read your thread a couple times and I think you have fully addressed the warping issue with the foam. However, if your plywood base bowed, it would take an edgewise glued 1 x 4" or similar. Still, if you have humidity issues you might be fighting that perennially.

The 1 x 4's should be straight grained and large knots should not be present.

My new layout is at 48" and I am just starting to lay down the track. I use sheathing as the base, which is set about 1" below grade of my key features. So, I lay out the plywood and build above it for the most part. It makes a good workbase and I can go up a lot.

I do not like foam at all because it feels "weak" to me. A totally personal feeling.

I go about it somewhat backwards in that I start with my surface, which in this case is 7/16" OSB. I cut out the size I need outdoors and reinforce it outside as well, then bring in to the train room and assemble. I just kind of keep reinforcing it until it is strong enough. This doesn't work for everyone.

This layout in progress is 48" in height. The room is 8':

View attachment 139082

To enter you duckunder where I am standing taking the picture. Door is closet, cut out to access. With a more open bottom, access is a breeze for even a 64 year old.

My legs are 2-2x4 screwed together.

I await your progress, Dave LASM
You know I've read both good and bad on using osb board for a layout. Most have said that it is prone to obsorbing moisture. Which wouldn't work for me in my current location. Now the fix for it was to seal it. Which has been suggested I do to my next layout. I wish I could have a dedicated room for my trains. The garage is like a dungeon. It's my biggest plague to my layouts.
 



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