(One Hundred Questions on Waterproofing) #41: When performing waterproofing work on roofs, what are the key points to pay attention to for areas such as centralized water meter locations, water supply and drainage pipes, fire-fighting water pipes, cooling tower side areas, or base structures?

Answer:

(1) Construction procedures: Waterproofing should be carried out first before the installation of the water pipes and before all the base plates and pipe support structures are cast in place; the procedures cannot be reversed.
(2) Before waterproofing work, it is necessary to first make a layout to confirm the correct location and scope of the work.
(3) A gap of at least 30 cm should be left between the new and old waterproof materials at the connection points.
(4) When applying the subsequent waterproof material, the connection points must first be coated with a primer.