Then, I balanced a piece of the 2x8' long 2" foam on the end (factory-straight edge facing the existing layout, parking lot cut edge away from the layout) and drew an outline of where to cut underneath the foam with a marker. Then, it was flipped over so that I would work from the top.
My hot wire foam tool made quick work of cutting outside the edge. I left extra material for now.
Then, the foam was glued in place. I used leftover latex caulk and foam-safe construction adhesive during the process as I had several half-full bottles on hand. My wife's weights held it in position to cure.
I then took some scraps and repeated the process to fill in the very end pieces. Note that there were sizeable gaps between the two because when I cut the foam in half in the parking lot I wasn't precise. It doesn't make a bit of difference in the end, but it looks a bit ugly. What did make a difference was finding out the thickness of the foam wasn't consistent across the entire 4x8' piece. The two sections I used for this end weren't the same thickness!
I later went back with my hot wire tool and cleaned up the edges. I didn't care if I took off too much, but I certainly didn't want to leave any protruding over the sides which will later cause problems when I finally add my fascia boards.
Finally, I used my modified wooden yardstick to draw in the O-48 (48" diameter) curves on the ends. I added about 2" of straight track at the joint before marking the curve, which should help prevent derailments at the joints.
Cork roadbed (I bought a box used several years ago and still have some left) was glued down with more latex caulk and held in place with pins. At the joints, I used thin wood and cardstock to build up shims to match the height of the existing sections (wouldn't you know that the new foam on the ends was thicker than the old foam? Grr).
I later used a Stanley Surform tool (essentially a metal grater blade) to build a ramp in the cork roadbeds at the ends of the curve to lower them down to the existing layout's roadbed height.
Finally, the foam got a coat of brown paint. Later, the roadbed got a coat of gray paint which isn't entirely necessary but it makes everything look nicer until the track is installed.
Now, I just need to buy some track!





