This element of drainage system serves for overflow of rainwater in case of clogging of roof drains to prevent flooding of the roof surface and consequent possible damage. Overflows are available in two sizes, DN 70 and DN 100mm.
Overflows F are suitable, due to the flange, for mechanical attachment to any waterproofing.
Overflows inserted through the wall are anchored by suitable screws, preferably with a round or oval head, to prevent damage to the waterproof membrane. It is recommended to use low-expansion adhesive foam from the external side at the space between the wall and overflow pipe. Then fasten the cover plate by screws and install the elbow in the required direction. Then connect the elbow with a pipe by coating contact surfaces with polyurethane sealant. For fixing the decorative cover plate use only stainless steel fasteners to prevent cosmetic damage to facade surface.