Final answer:
The installation standard requires that for roof sheathing less than 3/8 inch thick, the fasteners for asphalt shingles must penetrate through the sheathing.
Step-by-step explanation:
The question pertains to the installation standards for asphalt shingles on roofs, specifically the required penetration depth of fasteners relative to the thickness of the roof sheathing. The International Building Code(IBC) and the International Residential Code(IRC) provide specific guidelines on roofing practices, including shingle installation. Although code requirements can vary by region, a common standard is that for roof sheathing less than 3/8 inch thick, the fasteners (nails) must penetrate through the sheathing.
Proper fastener penetration ensures the stability and weather resistance of the shingle roofing. It is generally recommended that for shingles, nails penetrate at least 3/4 inch into the roof sheathing. If the sheathing is less than 3/8 inch thick as mentioned, nails should pass through its entire thickness and potentially extend into the roof structure below to achieve sufficient anchoring.