The Saddle Roof Base is made for installation on the ridge or peak of the roof, straddling the peak of the roof. Weather proof construction that features a large flange and heavy duty galvanized metal . Crimped for top for chimney cap or roof vent application including our globe vents, rain caps, Artis Vacuum Cap, Aero-foil or MVR ventilators. Please email us your roof slope pitch for proper construction.