What's 1/4" rainwall? Are you talking about rainscreen construction? Both of the products that you mention are durable and light. Neither will be affected by road vibration. Both work well enough. I've read your blog, so my advice would be to go with whichever one you can obtain more cheaply. My impression is that you're buying *way* too much stuff new and at retail prices. Ramp up your scrounging skills. The search for cheap materials does not begin and end with Craig's List. Some advice: First, make a list of materials that you are seeking. Then, get prices for these materials when obtained the conventional way so you'll know whether or not something is a good deal. Enlist your friends and family - not just first-level F&F either, cast a wide net. Distribute your list to them and ask them to keep an eye out for prospects. Every day, you should check not only Craig's List, but also the more old-fashioned classified ads in your newspaper. When you go to look at a prospect, bring a suitable vehicle to carry away the goods and bring cash (small bills). Vendors don't like to store objects that you've bought from them, they don't trust checks, and they don't make change. The most important thing to remember with vendors is that they are more interested in getting rid of what they are selling than the money that they're asking for it. The importance of haggling cannot be overstated. Particularly when dealing with Craig's List vendors, you must never offer the asking price (they will sneer at you behind your back). Become at ease with phrases such as "You're taking the food from the mouths of my children," or "Who do I look like, Rockefeller?" Find something, anything, that is unsatisfactory about the product and use it as a basis for offering a lower price. "Thirty dollars? That toilet is ok, but I don't think that avocado green is coming back. Tell you what, I'll give you ten bucks for it if you help me put it in my car right now." (Hold out a ten dollar bill.) Hint: try this the next time you're in Nordstrom. Don't be afraid to sell out ethically or morally. The people who sell what you want will invariably be right-wing wackos. Smile and play along. Tell them that you are late to meet them because you were caught up while listening to Rush. Laugh at their Hillary jokes-- "Ho, ho, ho, you are soooo funny, Mr. Wacko. Its a pleasure to be doing business with a fellow Nazi." Every lumber yard has a "bone yard." This is the place where the orphans go. Special orders that were wrong or never picked up, scratch & dents, discontinued items, etc. The yard managers are usually willing to negotiate on price. Specialty dealers have similar opportunities -roofing, plumbing, electrical, paint - they all have deals if you bother to ask. Make rounds to these stores regularly, bat your eyes at the manager, get to know him, and he may even hold things for you. Often, you find great deals on things that you don't really need. The obvious solution is to buy the great deal and then work it into your plans. (Enlarge the bathroom floor plan to accommodate that bidet that you just got a great deal on.) Twice a year, in my home town, they have clean-up day. Residents can put anything out on their sidewalks to be collected & taken to the dump. This stuff is free for the taking. Just cruise up and down the streets & load up whatever you want. Doors & windows are common finds. Commercial construction or renovation sites are great resources. Their dumpsters can be rich sources of reusable building materials. You would be amazed at that access that you will be granted for the price of a box of donuts. In fact, if you get to know the construction super (do the eye-batting thing again) and bring donuts regularly, he might even set stuff aside for you so that you don't actually have to climb into the dumpster. Must be a helluva blog. . .