Waterproofing & Drainage

Water seepage in buildings can cause damage to building structures and finishing, as well as poor environment quality and health problems for inhabitants. Protection against water's destructive forces is vital in the design and construction of buildings. The effective approach is integration of good waterproofing and drainage system - a simple concept of keeping water out and channeling water away quickly. While simple in concept, proper planning, design, selection and installation of every component is required to make sure that the system work. -- Elmich Waterproofing & Drainage

Last week during a presentation by Elmich personnel, my colleague inquired regarding the detailing of drainage and expansion joint detail. Expansion joint detail is especially tricky due to the movement of the structure.

Below is the detailing for reference : -

Internal Wall & Slab Drainage Detail

Expansion Joint Detail

One of the most popular product for green roof /inverted roof/non ventilated metal roof is evalon.

Also, we learnt about Versi Drain which is grate for balconies, terraces and podium decks. This could be used in roof garden (which eventually has no plants) in Changi General Hospital.