The siding looks like composition shingles (like regular asphalt-type roofing shingles, but are brown and gray color). Any idea how much a lab would charge to test a piece of the siding? Reasonable to have the seller pay for this test, or should it be on me since I'm the buyer and the "concerned party?" I know I can ask the seller to do all sorts of things, just need some guidance on what "the norm" is in this type situation (obviously, I'm new to all this). Thanks for any advice!!