Inertia bases consist of structural steel channel perimeter frame, reinforced steel, equipment mounting templates with anchor bolts and spring isolators with height saving brackets or recessed spring pockets upon request. Spring deflections in 1″ to 2″ are available. Inertia base thicknesses of 6″ to 12″ are available. Used together with roof curbs, CT rails are available to accommodate large roof mounted/ground mounted equipment for partial perimeter applications. Spring isolation available with 1” or 2” deflection.