The junction of color steel plate roof, facade wall and protruding roof structure shall be treated with flashing, and the height of flashing shall not be less than 300 mm. The flashing and the top of the wall shall be lapped along the water, and the longitudinal lap width along the water direction shall not be less than one wave peak, and the full length sealant shall be set between the two plates for sealing; after the bolts are tightened, the lap shall be fixed on the supporting member with self tapping screws with waterproof sealant pad; the transverse lap width shall not be less than 200 mm, and the formed rubber waterproof pad (KL plate top seal) shall be used between the flashing and the roof color steel plate Fill in.

Gable flashing joint 4 out of roof component

1) Tubular penetrations: firstly, take holes on the color steel plate according to the design position and size, fix the cylindrical sleeve with flange produced by a manufacturer on the color steel plate, the middle point of the sleeve shall coincide with the component through the roof, the sleeve flange shall completely cover the opening, and then fix the separate steel plate flange on the sleeve flange with blind rivets, the flange and sleeve flange Special sealant shall be used to seal the joint of the color steel plate, and then the seal of the conical shield shall be fixed on the components through the roof with the fastening hoop, and a gap shall be left between the shield and the sleeve to facilitate the thermal expansion displacement of the roof structure.

2) Outlet of roof fan: as the outlet of roof components will cut off the steel plate drainage channel and hinder the drainage direction, special flashing shall be installed at the protruding roof components for drainage. First, install the color steel plate terminal framework of gutter roof, and then fix the drainage chassis. The gap between the color steel plate rib and the drainage chassis shall be filled with special shaped rubber plug, and the outside shall be sealed with special sealant, and then install the flashing. The above methods are used to seal the joint of flashing plate, drainage chassis and color steel plate. The height of flashing plate and the overlapping width of flashing plate and color steel plate are the same as that of gable.

The length of steel plate between two expansion joints of concealed color steel plate roof shall not exceed 35m. The method is as follows: raise all purlins of color steel plate on the lap joint and the support of color steel plate on the roof to form a height difference of 15mm higher than the depth of color steel plate. At the height difference, the lap length of color steel plate on the roof shall not be less than 250mm and shall be sealed. Auxiliary purlin or support shall be set at the drop. After the installation of the roof color steel plate with sealant applied to the expansion joint, the joint between the flashing plate, roof ridge edge, etc. and the color steel plate shall be sealed with weather resistant sealant; all exposed self tapping screws shall be protected by applying sealing materials. When the pop rivets are used, the sealant shall be filled in the middle hollow part.