RG2016DDC Cast Iron RoofGuard Home » Products » RG2016DDC Cast Iron RoofGuard MIFAB® RoofGuard Model RG2016DDC cast iron replacement roof dome with an 19” diameter, horizontal slotted, free area drainage design. The RoofGuard has a 10 year limited warranty. Specification Sheet Catalog Catalog Current Catalog: MPB-2022 Downloads Downloads Rainfall Rates U.S. Cities Roof Guard FAQs Watch Video! Return to Products