Max-Lok

Max-Lok is the widest PAC-CLAD wall insulated metal panel. Its 45 inch coverage width covers more area per panel than the 42 inch panels in the same group.

The side joint is arranged so that sealant can be placed accurately and the joint forms a vapor seal.

Max-Lok is listed for partition walls, liner walls and tee-supported ceilings. Unlike Shadow-Lok, Design-Lok and Mesa-Lok HSE, it is not listed for exterior wall use.

• Coverage width: 45 inches.
• Thickness: 3, 4, 5 and 6 inches.
• Made in lengths between 8 feet 0 inches and 53 feet 0 inches.
• Exterior and interior gauge: 26.
• Nominal R-value: R-8 per inch of thickness.

Both skins are Galvalume. Exterior and interior finishes are the same three systems: polyester, siliconized polyester and plastisol (PVC). Both skins can be embossed or smooth.

The core is poured-in-place polyisocyanurate foam applied continuously. The joint is an offset double tongue-and-groove, listed as Green-Lock in the guide specification.

Heat flow meter testing (ASTM C518) gives a K-factor of 0.139 Btu-in/hr-ft2-F at 75 F mean and 0.129 at 35 F mean. Leakage through the panel is 0.0011 cfm/sf at 20 psf (ASTM E283), and water penetration at 20 psf is zero (ASTM E331).

• Shear strength 16 psi, compressive strength 18 psi, tensile strength 21 psi, apparent density 2.25 pcf.
• At least 90% closed cells.
• ASTM E84: flame spread under 25 and smoke developed under 450.
• FM 4880: Class 1 fire rated, technical bulletin ATB-0005.
• ASTM E72 strength results are given in load tables.
• FM 4881 and TAS 201 are listed under impact resistance.

The panel factor of safety is 2.0. For fasteners it is 2.25 with two fasteners into steel, 3.00 with one fastener into steel and 4.00 with one or two fasteners into masonry. Loads are calculated from ASCE 7-16 and deflection is limited to L/180 or the code limit, whichever is greater.

Fatigue testing of 2,000,000 alternating L/180 cycles, twenty-one freeze/heat cycles from -20 F to 180 F, 1,200 hours at 93% humidity and 158 F, and autoclave exposure at 218 F and 2 psig all leave the facer and liner bonded, with no foam fracture or permanent set.

Max-Lok has a 45 inch coverage width and both skins are 26 gauge. The side joint is an offset double tongue-and-groove, and a cross-section drawing and a joint image show the profile.

• Panel uses: partition wall, liner wall and tee-supported ceiling.
• Technical bulletins: Flame Spread Smoke Developed, K-Factor, NFPA 285 and Panel Weights.

Max-Lok details cover horizontal and vertical open framing at door header, door jamb, inside and outside corners, side joint, sill and window header, jamb and sill, with a stack joint detail in the vertical set.

Max-Lok is the one range profile with a 45 inch coverage width. Its sibling Max-Lok HSE is also listed on the manufacturer's navigation. Carlisle Corporation owns Petersen.