Mechanical-Lock Standing Seam

What This Service Involves

Mechanical-lock standing seam is the strongest concealed-fastener metal system we install, and it is the right call for low-pitch or heavily exposed Puget Sound roofs. The seams are folded and crimped in the field with a power seamer, creating a double-locked joint that resists wind-driven rain and standing water far better than snap-together panels. This makes it ideal for the shallow-slope additions, coastal bluff homes, and wind-battered ridgelines found throughout Western Washington. When correctly sealed at the seam, these roofs shrug off decades of Northwest storms with minimal upkeep.

Benefits

Double-locked seams offer the highest resistance to wind-driven rain in our region; suitable for lower pitches where other metal systems cannot go; concealed fasteners avoid corrosion and leak points; handles thermal expansion without stressing the deck; extremely long service life in a saturated climate

Our Process

1) Assess low-slope suitability and confirm seam and sealant specifications; 2) Install high-temp underlayment and full ice-and-water membrane; 3) Set panels and mechanically crimp seams with a powered seamer; 4) Seal terminations, flash penetrations, and perform a water-tightness inspection

What Affects the Cost

Low-slope engineering and seam sealant requirements; panel gauge and premium coating; field-seaming labor and equipment; valley, curb, and penetration detailing; underlayment and decking upgrades

Best Time of Year

We prioritize the driest summer stretch for mechanical-lock seaming and sealant curing in the Puget Sound area, while planning shoulder-season work under protected conditions.