Vinyl super-thick grade siding is 0.05 inches thick and is the best quality available. Builder's grade, which is the least expensive, is 0.04 inches thick. Other thickness include thin residential, which is 0.042 inches thick, standard residential, which is 0.044 inches thick, and thick residential at 0.046 inches thick.
When choosing vinyl siding soffit panels, the pieces should measure at least 0.05 inches thick to prevent sagging after installation.
Only store vinyl siding panels on flat surfaces. Even the thickest siding available can warp if suspended on 2-by-4s like lumber. Heat can also deform the siding, so homeowners should store unused siding in a cool area away from direct sun until installation.