Metal Over Metal Retrofit
ABC’s 238T Symmetrical Panel System is an excellent option for retrofitting, recovering, and new construction on slopes down to 1/4:12. The 238T’s symmetrical shape not only provides for a clean and efficient installation, but also allows for easy individual panel removal or replacement.
Metal over Metal Framing Options:
The Retro-Z and the Clip & Purlin System provide a rigid attachment directly into the original structure. Both solutions create a sub-frame used to install new panels over an existing metal roof.
Retro-Z
(Shown Above) A Retro-Z is a 16 gauge zee purlin that is notched out to fit over the ribs of an existing metal roof panel which is then attached through the old roof into the structure below. It provides a surface to install a new metal roof. The biggest benefit of using a Retro-Z is that it adds strength to the existing purlin.
Clip & Purlin System: Economical Alternative
ABC’s Clip and Purlin System incorporates a variable height 12 gauge L clip that is attached through the existing roof into the structure. The Clip is then connected by a 1 3/4” tall, 16 gauge zee purlin, providing the new roof structure. This is an economical retrofit alternative that allows up to a 6” space between the old and new roof to add insulation.
