Example of a commercial built-up roofing system in cross-section showing various materials including asbestos felt layers. From bottom-to-top: tan-colored fibrous insulation (non-ACM), gypsum insulation with wood fibers (non-ACM), multi-layer asbestos felts with bitumious coating and stone aggregate, brown fibrous insulation (non-ACM), black membrane covering (non-ACM), and plywood (protective walkway).
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