(1) Longitudinal lap joints: (existing in the roof due to the lack of lap joints caused by the unit length of the sheet) Treatment method: The OFAN waterproof system of 25cm wide is used to cover the plate joints, and the original waterproof layer of the old roof needs to be removed.

(2), horizontal lap joint: (old plate type roof and new roof plate in the edge position of the lock is not good there are such problems) treatment method: the use of 10cm wide waterproof layer cover.

(3) Roofing screws and fasteners: Treatment method: covered with waterproof layer of 10cm×10cm width.

(4) Special attention to the root of the fan base, exhaust outlet, ventilation window and other equipment on the roof:

First of all, we must ensure that the parts that need waterproof treatment are unobstructed, such as easy to retain water, and then waterproof the roof panel after modification. Usually many construction units in the treatment of these parts, will add some water baffle (flooding), but we found that many are unreasonable design, counterproductive, and even after the rain stops for a long period of time, the rain will remain inside, thereby corroding the facilities and roof panels. Usually produce water leakage of these roof facilities, some because the root of the water face between the two peaks of the rain, drainage is not smooth, coupled with some of the use of complex waterproof materials there are some microholes, joints, cracks and other reasons. We propose to reduce the crest of the roof panel within 20cm of the root of the water facing facilities.

(5) The OFAN waterproof system through the root of the roof pipe mouth has absolute advantages in dealing with various sizes of complex pipe mouths on the roof. Usually the large pipe mouth treated with rubber cover sheet, in the upper mouth, lower mouth and side sealing of the rubber layer, there is no doubt that three joints are naturally formed (that is, three waterproof hazards). The OFAN waterproofing system we use is constructed in a liquid state, and forms an integral jointless flexible waterproofing layer tightly combined with pipes and roof panels after drying.

(6) The roof ridge cover plate on both sides of the water leakage is usually caused by the roof plate rolled up height is not enough, the cover cover is not in place, and the cover plate is not fixed well.

(7), the height of the collapse, the root of the parapet wall these parts are the installation of the flood plate is unreasonable or there is a horizontal horizontal joint in this area.

(8) The joint between the roof lighting window and the metal roof plate.