Rusty Stumps 1:48 corrugated: Appears to be .060" peak-to-peak ... which would be close to 2" spacing in either scale. (1.92" in 1:32 .... or 2.1" in 1:35) I don't have the Builders-in-Scale material for direct comparison. The stuff I got from Rusty Stumps has a slightly triangular look to the corrugations ... not a smooth wave-shape.
Rusty Stumps 1:35 brick sheets: I had Walt Gillespie at Rusty Stumps custom-cut some of these for me recently, and now they're on the web site:
http://www.rustystumps.com/proddetail.asp?prod=L1701 (basic brick)
http://www.rustystumps.com/proddetail.asp?prod=L1702 (aged brick)
The face of each brick measures approx. 3x8" on a 1:35 scale rule. He also has various fancy brick patterns in smaller scales, and may be willing to custom-size those. BUT ... interesting note ... on the "instructions" for the brick sheet, he notes that you should NOT flex the sheet too much, as individual bricks might pop loose. Which, of course, immediately made me think: "Ooh, if I need individual bricks, I can cut off a piece of brick sheet and flex the crap out of it!"
Rusty Stumps 1:35 stair stringers: These are NOT on the site right now, but I asked Walt to "up-size" some of his 1:48 stringers for me. NOTE that these have "ye olde" 1:1 rise/run, which is not suitable for all prototype applications ... but is found on some of the small real-world buildings around town here.
With a 1:35 scale rule, it's 8" rise over 8" run ... the stringers are long enough to do a 1:35 staircase that's around 23-24' scale height. (I'd have to punch out the laser-cut stringer and measure at the proper angle against a square to check that ... and I haven't ... so it's somewhere around there! Anyway, it's the max. length that fits on the standard RC board sheets that he uses.) (I could also measure the hypotenuse and figure it out from there, but I don't feel like it.)

The stringers are NOT on the site, but you can email Walt thru the site ... if you want 1:35 stair stringers, you can tell him you want some like Dallas got, and he'll already have a file set up ... if you want some in 1:32 with the same rise/run, he can customize that easily ...
Real-life demands are insane at the moment, so I don't have snapshots of any of this stuff ... it's all stashed with hopes of making more progress on my 1:35 cafe dio at some point!

Now, back to off-topic bs: I had some lovely jambalaya last night.

Cheers,
Dallas