Products / Double-Lok
Double-Lok
UL 2218 Class 4Double-Lok is MBCI's mechanically field-seamed, trapezoidal-leg standing seam roof system for industrial, commercial and architectural applications, using 2-inch and 4-inch sliding clips (low and high versions) to accommodate thermal movement. Its data sheet gives 18-inch or 24-inch coverage widths and a 1/4:12 minimum slope, in 22 or 24-gauge steel with Galvalume Plus, Signature 200, Signature 300, or Signature 300 Metallic finishes. The data sheet lists UL 580 Class 90 uplift ratings (multiple construction numbers), FM 4471 approval, and Miami-Dade County NOA #24-1113.01.
Manufacturer
Material
Impact class
UL 2218 Class 4Warranty
20 (paint finish, Signature 200/300); Galvalume/Galvalume Plus substrate warranty (term varies by coating); 1 (fabrication/product warranty) (paint finish, substrate (Galvalume) and fabrication warranties, tiered by coating system selected)
Standards met
UL 2218 Class 4 (Impact Resistance)UL 580 Class 90 (Uplift Resistance, Construction Nos. 165, 180C, 287, 308A, 450, 538, 539, 540)FM 4471 (roof performance, uplift resistance)Miami-Dade County NOAASTM E1680 (air leakage, roof panel joints)ASTM E1646 (water penetration, roof panel joints)ASTM E1592 (structural uplift resistance test)UL 790 (room fire performance; data sheet cross-references a separate Class A Fire Rating document, not itself fetched)
Status
active
Spec sheet