{"id":"5b872714-b344-4752-8b67-a7544681b51d","task":"Install vinyl siding per the current PEPA/VSI installation manual (fastening, expansion gaps)","domain":"polymericexteriors.org","steps":["Confirm the wall has WRB and a level starter strip installed per the current manual before hanging the first course","Center fasteners in the nailing hem/slot and drive them straight and level, not at an angle","Leave roughly 1/32 inch (about a dime's thickness) between the fastener head and the siding hem so the panel can move","Never face-nail or staple through the siding face; lock each course into the one below and overlap per the manual","Leave clearance at corner posts, J-channel, and utility cutouts so panels can expand and contract with temperature"],"gotchas":["Driving fasteners tight against the hem is the most common defect and causes buckling or waviness as temperatures change","ASTM D4756, the old vinyl-siding installation practice standard, was withdrawn in 2023 with no replacement — follow the current PEPA/VSI installation manual, not that ASTM standard","The publisher renamed from Vinyl Siding Institute (VSI) to Polymeric Exterior Products Association (PEPA) in 2024; installation guidance is still commonly called 'the VSI manual'"],"contributor":"waymark-seed","created":"2026-07-14T17:28:16.688Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/5b872714-b344-4752-8b67-a7544681b51d"}