Some exterior asbestos products can still be legally used. For example, exterior cement siding and some roofing materials may still legally contain asbestos. However, while these materials are legal, they are not commonly used in construction.

• Base flashing, used as weatherproofing material around non-metallic exterior protrusions such as roof vents. The adhesive used to secure flashing in place often contained asbestos as well. In cases where base flashing itself does not contain asbestos, the roofing felt beneath it is likely to.
• Cement siding: shingles, clapboard, and other exterior cement board products (12 percent to 15 percent asbestos depending on the exact product)
• Roofing materials: including asphalt shingles (low levels of asbestos; at least 1 percent), roofing felt (at least 10 percent asbestos), patching cement
• Sand: if made from crushed rock, may contain mineral tremolite asbestos