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 Post subject: Foam scenery
PostPosted: Fri Oct 02, 2015 6:54 am 
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I've been wanting to put a hill/tunnel at the far end of the layout for a long time...finally decided to take a crack at it this year. In the past I've used the framework/screenwire/plaster or the cardboard/crumpled-newspaper/plaster-soaked-papertowel method for building hills...this time I'm going to try using foam insulation board. I've noticed that a lot of folks use it, and read a few articles on how to do it. There are also a number of useful YouTube videos on construction/painting. Still, this is new to me so don't think I'm an expert or that this is the optimal method. I'll show my progress here.

One thing to know is that there are two types of foam board - "extruded" and "expanded". "Extruded" is the pink or green sheets you can find at the local building supply store, typically sold in 4X8 sheets in varying thicknesses. This stuff is pretty rigid, relatively strong, and is what you want to use for foam scenery. "Expanded" is the white sheet/block stuff you frequently find used as packing material, comprised of billions of small white pellets bonded together by a heat process. "Expanded" is brittle, relatively weak, and doesn't handle chemical bonding agents well...for these reasons I am told one should not use "expanded" foam for scenery projects. I'm going to buck that advice and use a bit of it underneath as a backer, but the face and top of the hill will be built exclusively of "extruded".

The first thing I did was make a couple of tunnel portals out of pine lumber. I painted them with some textured spray-paint, then oversprayed that with various colors to give them a concrete-look. Then I printed some brick paper from the Building Textures section of the website and used that to make a few panels that I cemented inside the portals to give the illusion of a lining. Here's a few pic's:

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One critical thing to do before going any further is to make sure your trains will negotiate the portals without hitting the sides. I had to move them around a bit to be sure my largest locomotives would safely pass through with enough clearance. It turns out that I have some scale passenger cars that are much too big to handle the curves and the position of the portals...they rarely get run so no big deal. Everything else clears.

With the portals anchored to the table I started boxing in the hill. I used four blocks of "expanded" foam as supports. and made a top out of 1-1/2 inch "extruded" foam. I used Gorilla Glue as a bonding agent...it seems to work okay with the foam when I tested it on some scraps.

I'm going to build the front slope/face separately, sculpt/paint it, then mount it to the front of the hill. The front slope will be built by piling up multiple layers of 1-1/2 inch foam, like rock strata. I think I'm going to use bits of foam and some HydroCal plaster to fill in any gaps...we'll see, this is a bit of an experiment. Across the back I'm going to attach a 2X4 1/4-inch section of masonite as a back-drop.

Here's where I am:

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The pic is a bit dark...need some more light. I'll post more pic's as I proceed.

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Sat Oct 03, 2015 8:49 pm 
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I finished the rough-in for the lower-front of the hill:

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I built it up but left it detachable so I can work on sculpting it remotely, paint it, than put it back in place:

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I think I'll work on the top of the hill before I start sculpting. Need to practice a bit.

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Sun Oct 04, 2015 6:28 pm 
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Looks like a great start. Love the brick tunnel linings. :-)


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 Post subject: Re: Foam scenery
PostPosted: Wed Oct 07, 2015 11:05 am 
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I built it up a little further, and then tried a bit of carving/experimentation:

Image

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We'll see how this goes...I need to figure out how I want to finish the upper-half where it slopes to the top. I think I may use foam contours/partitions and then go back to the HydroCal/paper-towel method.

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Sat Oct 17, 2015 2:20 pm 
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Continuing across the upper tier of the rock face, carving and painting as I go:

Image

Image

On one of the other forums it was recommended that the foam be base-painted with flat latex paint. I looked around at Lowes and Home Depot, but the price of a quart of paint seemed high. Picked up a quart of Glidden at Walmart for $8.52...seemed like a deal. Got some gray with just a hint of green in it. It's alot easier to evaluate the look of the carving after being painted.

Hoping to finish the top half of the rock-face today and then start the removable section that stretches between the portals. Then I think I'll build the plaster top before I start weathering the rock.

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Mon Oct 19, 2015 9:27 pm 
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The Smothers Brothers' "Boil That Cabbage Down" routine included Tommy talking about the pioneers "cursing and hacking" their way through the wilderness. I see you've got the hacking part down. Looking great. Thanks for keeping us posted!

- Paul


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 Post subject: Re: Foam scenery
PostPosted: Thu Oct 22, 2015 7:06 am 
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Okay, jump ahead a bit:

Image

Long ways to go...

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Fri Oct 23, 2015 9:38 am 
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Looking good! And I agree, the carving is easier to evaluate with a coat of paint on it.


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 Post subject: Re: Foam scenery
PostPosted: Sat Oct 24, 2015 4:45 pm 
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Still need to finish the sides and decide what to do about foliage (if anything):

Image

Last thing to do will be attach a partition across the back...hoping to wrap this up tomorrow.

Paul II


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 Post subject: Re: Foam scenery
PostPosted: Sun Oct 25, 2015 2:29 am 
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Looking VERY nice.


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