Benchwork and roadbed

bridge on a curve
i am nearing the final stages of laying the roadbed on my layout and have become a little stuck.
Masonite hard board for spline
Here we go again. Does anyone know where to get 4 x 8 sheets of masonite in 1/4" thickness near me in Glendora? I just can't believe how hard it is to get some of the materials to work with when ot comes to this construction. Really frustrated! Found two that said they had it. Went over to the one, and of course they didn't. The other is not open until monday, but I hate the place be cause they are unfriendly. But at this point I would buy it from the devil himself.

TO foam or not to foam....this is my question
After going through the track template posting, I have come up with a question. Now I understand that people have a preference and all, but with me on the verge of starting my layout, and only having one bridge, I am left to wonder, should I spend the extra money and put a 1" foam down on top of the plywood, per perhaps, just lay the track plan on the plywood, and just add my cork? My main line will be a 2 layer level of cork, and I will uses sheet cork where possible...but it is this question I am stuck with.
Humidity
I've been thinking--those that know me realize this is probably dangerous.
When does humidity affect track alignment, summer or winter?
The absorption of water by wood for any reason causes the wood to expand. Expansion of the roadbed does not cause kinks. Running the numbers indicate that a 10% increase in the moisture content of wood has a 20 times greater expansion effect on the wood than a 10 degree F change in temperature of the rail.
Is there some other effect in play here?
Terry

Cordless Drills
About six years ago I purchased a Dewalt cordless drill and now the battery will not hold a charge anymore.
I did not use the drill every day and let the battery sit on the charger ( which the instructions stated was ok ) .
Another helix question
Hi
I've enjoyed all the articles so far, especially regarding helixes (helices?) I'm building one in N-scale using 14" ply and Kato Unitrak (double track.) Question regarding feeders (I'm using DCC:) Should I solder the Unitrak sections together or use feeders at the 'joiners?" I'm planning 8 loops with a 2" rise between. Thanks.
Mark

Anyone in the building trades? Need advice please
I have the last coat of blue paint to put on the backdrops tonight and then I begin installing suspended ceiling grid. I am going to install lay-in panel drop ceiling from valance to valance and lay-in light panels from valance to backdrop. My valance uses 15" radius curves at the corners. Herein lay my conundrum.
How do I make curved corners with the wall bracket rail?

Return loop help needed
Hey folks-
need some help-I am doing a return loop, and I am tight on space-I have it in at a 22" radius but wondering if I should make it a min 24" radius, as I will be running 6 axle and the odd 85' car. With the 22" rad I have about 2.5 feet approx to work with, with the 24" I have 2ft give or take a few inches -the 22" is in pink-24 is gray-it is set to go under the main island for storage- any help would be great.
2 days of benchwork, my first attempt at anything bigger than a 4X8 oval with branches
Let me know what you think. We have been working on it two days, and the helix is almost ready to go up.
Trapezoid Helix design
I am planning to build a helix to expand my staging capabilities and am looking for a specific method of cutting the bench work. The design consists of sections of trapezoids that when butted together they make a circle. These sections are made by cutting a strip of plywood to the specified width and then cutting them to lengths at specific angles, By butting the sections a circle is created. With out CAD I am having difficulty in getting the exact measurements of the perimeter of the sections.
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