I am looking for a consultant with experience and knowledge with waterproofing, roofing, and drainage issues. Does anyone know of a company or individual in Bangkok that offers these services? (Not interested in calling out a roofing company for a free consultation...I already know what their recommendation is going to be!)

I've got a 20 year old university building with several different types of roofs, 15-20 different roof levels/sections and leaks all over. I've got a pretty good handle on the problem spots but I would like to find someone with more experience with the tropical weather conditions and Thai construction methods to review the situation and recommend a course of action.

English speaking would be very helpful but is not required. Could be an expat but I've got a pretty modest budget.

(If it's okay I posted this over in the Business Services section as well.)

Rather than call a roofing contractor contact some roofing materials suppliers and have them come and take a look.

Of course they are going to recommend their own products but you may get different solutions depending on system and can choose the one you like best and then specify that to a contractor, or use a recommended installer from the manufacturer.