if a universal version is purchased, the excess part is cut off;
then the penetration is put on the pipe and pressed against the roof. If the roof is ribbed, the waterproofing should take the shape of the ribs of the covering;
then a sealant is used, which is applied to the edges of the flange and pressed firmly against the roof;
The final stage is fixing the flange penetration to the roof using self-tapping screws or rivets.
The photos provided clearly show the process of installing waterproofing.
Metal passage
Another option for waterproofing a metal pipe can be a uae mobile database penetration, which is also sold ready-made. It has excellent characteristics, but can only be installed on a roof that does not have a relief pattern, for example, a soft one. Another condition necessary for a tight installation of the flange to the coating is a perfectly matched angle of the element to the roof slope.
There are different models of metal penetrations. On some of them, the pipe is fixed and soldered from the inside, and the upper chimney head is put on and welded from the outside.
Metal flange for round pipe
when the pipe passes through the passage and a detachable metal part is fixed on top of it, preventing moisture from penetrating inside.
The flange is glued to the roof using sealant and then screwed in place with self-tapping screws.
Square, rectangular pipe
A brick chimney is almost always square or rectangular. Passing through the attic, it is brought to the roof. Then, a hole is made in the roof, which should be decorated from the inside with a metal sheet with a hole made in the middle in the shape of the pipe. Through this window, the head is brought out to the roof surface. This option is convenient when bringing the chimney out through frequent sheathing in the roof, for example, when a soft roof is installed.
If the lathing is installed at a certain distance (for example, slate roofing), it is good if the pipe passes between the rafters. But it also happens that the pipe rests against one of the beams supporting the roof or they are too far from the walls of the pipe. In this case, it is necessary to arrange additional parts of the rafter-beam system, which will allow you to fix heat-resistant insulation and waterproofing around the chimney.