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MasterLock-90 is a trapezoidal standing seam system designed for projects with slopes as low as 1/4":12". MasterLok-90 is best suited for simple sloped roofs with out dormers, hips, valleys, or other special conditions. ML-90 can be installed over solid decking or substructural members.

MasterLok-90 Structural Standing Seam Roof Systems from McElroy Metal represent the finest in a structural standing seam system. Proven by stringent UL-90 wind uplift testing, MasterLok-90 systems offer the ultimate in strength, weather ability and wind resistance. Designed for simplicity of installation, MasterLok-90's proven snap-together locking system allows panels to be installed on either side of the roof simultaneously, from one end of the building to the other. To ensure total weather tight integrity for slopes as low as 1/4:12, MasterLok-90 panels incorporate full 3" high standing seams complete with factory-applied sealant. In addition, all penetrations are made outside the building envelope. Endlaps, when required, are tightly sealed using a compression connection.

McElroy Metal's Medallion-Lok Structural Standing Seam Roof System combines the style and beauty of an architectural product with the load handling characteristics of a structural roof system. Medaliion-Lok's design and structural capabilities, including UL -90 classification, make it equally well-suited for residential, commercial and industrial applications. Medallion-Lok is also an excellent choice for mansard or fascia. Panels are joined by an integral locking system and held in place by concealed metal clips. A bead of sealant is factory applied in Medallion-Lok's seam upon request. The Medallion-Lok System may be installed over solid decking. For installation over sub-framing, McElroy manufactures a complete line of substructural components. The Medallion-Lok System utilizes 24 gauge GALVALUME panels, available in McElroy Premium Kynar 500 colors. Standard panel width is 16". Other widths are available upon request. Medallion-Lok has been tested for air and water infiltration in accordance with ASTM E283 and ASTM E331-86 procedures. The use of a proper moisture barrier or adequate ventilation is required to prevent condensation. Minimum slope of 3:12 is recommended.

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Testing
UL 90- Uplift Best
Class A  -Fire Rating
ASTM E 1680 - Air Infiltration
ASTM E 1646 - Water Infiltration
UL 2218 - Class 4 Impact Resistance


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MasterLok-90 Panel Options
Panel Width: 24"

Standard Panel Length: Up to 40'
Please inquire for longer lengths.

Minimum Slope: 1/4":12"

Substrate: Glavalume®

Paint System Kynar 500®

Gauge: 22 and 24

Factory applied sealant in seam to improve weather tightness.

Oil canning is a natural occurrence in metal panels and is not a cause for panel rejection.

 
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MasterLok-90- Section Properties
Better Built Metal Sales Top In Compression Bottom In Compression 
Panel Gauge Weight
PSF
FY
KSI
Ix
IN.4
Se
IN.3
Ma
KIP IN.
Ix
IN.4
Se
IN.3
Ma
KIP IN.
24 1.24 50 .3202 .1291 3.97 .1722 .0994 2.98
22 160 50 .4136 .1666 4.99 .2385 .1391 4.16
 1) Section Properties are calculated in accordance with the 1986 Edition of Cold Formed Steel Design Manual.
 2) Ix is for deflection determination.
 3) Se is for bending
 4) Ma is the allowable bending moment.
 5) All values are for one foot of panel width.
ALLOWABLE LOADS ( PSF)*
LIVE LOAD DEFLECTION (IN)
Panel Gauge 3' 3.5' 4' 1.5' 5' 5.5' 3 3.5 4 4.5'' 5' 5.5'
24 257 189 145 114 93 77 .20 .23 .27 .30 .33 .37
22 360 264 202 160 130 107 .20 .23 .27 .30 .33 .37
 1) Allowable loads are based on uniform span lengths and Fy of 50 KSI.
 2) LL is allowable gravity load.
 3) Deflection resulting from the load LL and is limited to L/180 of span.
 4) Weight of the panel has not been deducted from the allowable load.

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