The RoofCo Flat Sub Base (3 inch Tall – No Crimp) or FB34 is designed to give a roof vent three inches of additional clearance for installation on a tile roof. This product features a large flange for easy installation and leak protection. No field trimming is required. The Flat Sub Base (3in. Tall – No Crimp) comes in a range of sizes: 3¾ inch, 7¾ inch, 9¾ inch, and 11¾ inch. The Flat Sub Base (3in. Tall – No Crimp) is manufactured in the United States using quality 28 gauge galvanized steel. The Flat Sub Base (3in. Tall – No Crimp) comes with a 1-year warranty against product and workmanship defects. If you have any questions about this product, feel free to contact us by phone or email.
