A: Leakage comes from unreasonable joint of panels
Locking screw roofing system uses a large number of attacks since the screw, with the increase
in life span, sealing washers will eventually aging¡£
Expansion and contraction will lead to the self-tapping screws loose and tearing the roof slab¡£
Kok Chi series of plates is not entirely occlusion, and no preset stickers, can stop capillarity¡£
Since many manufacturers to produce 475 plate (Pittsburgh-old), although 360 ¡ã occlusion
But no preset stickers, still unable to prevent capillarity¡£
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