Answer:
The most vulnerable areas of the roof with a diagonal frame are:
(i) Through-the-wall pipes around the water fall head.
(ii) Structural cracks in the planar part.
(3) The intersection of the beam itself with the plane (the corner construction seam).
The reason is:
(1) The anti-sloping roof has a staggered groove pattern on the roof surface, which makes it prone to water accumulation.
(2) The drainage holes inside each groove are connected, which makes them easy to clog and affects the accumulation of water in other grooves.
(3) To increase the usable space of the roof, many owners fill the grooves with foamed cement or PC concrete. This causes the floor slab itself to bear a heavier pressure than that of an ordinary roof, resulting in cracking at the intersections of the floor slab and the crossbeams, causing water leakage.
(4) The concave and convex corners are particularly numerous and are particularly difficult to construct, which easily leads to a casual and sloppy attitude among workers, making it difficult to carry out the construction properly.