Answer :
Final answer:
Siding is not typically used as counter flashing on dormers, as it serves a different purpose. A valley refers to an angle created by intersecting roof planes, which may not be part of a dormer, and a gable dormer should indeed have step (base) flashings for proper waterproofing. The points of shingles or roofing materials may need to be properly trimmed to fit around the flashings.
Explanation:
The question pertains to the appropriate installation of flashings for a dormer, which is an architectural structure that protrudes from a sloping roof surface. Regarding whether siding can be used as counter flashing, typically, siding is not used for this purpose. Flashing is a material such as metal, designed to prevent water from penetrating the junction of a roof with another surface; siding serves a different purpose, which is to cover the exterior walls and is not meant to replace roofing materials.
A valley refers to the internal angle formed by the intersection of two sloping roof planes. Valleys generally require their own specialized valley flashing and are not part of a dormer if the latter runs parallel to the main roof ridge.
In the case of a gable dormer, it should have its own set of step (base) flashings as part of the installation process. These step flashings are essential for waterproofing the intersection between the dormer walls and the roof, and they should be properly integrated with the roof shingles or tiles. As for cutting the points, it's likely referring to the proper trimming of the shingle tabs or other roofing materials to fit around the flashing. This is a necessary step to ensure a snug and waterproof fit.
