I recently got my spring issue of Waterproof! Magazine in the mail… This issue has a great article on using crystalline admixtures for waterproofing concrete. I have used Kryton myself in the past on several projects with great success.
There’s also a very interesting article on waterproofing being done on a yearly basis at Niagara Falls in Buffalo New York.
The other article that I found very interesting was by amir Hassan on protecting parking decks.
Be sure to click on waterproof magazine’s ad and go to their website and while you’re there subscribe I think it’s still only 20 bucks a year.
I’ve had this Q & A page at JLC online on my to do list for a while now to post up here for you all…while the discussion is about drainage problems on low slope roofs, the photo they use is a deck over living space with tile on it and ponding water. And of course, decks over living space with tile or pedestrian traffic coatings on them are roofs as well, just that we walk on them too.
Frank discusses how a roof deck can pond water even when it’s “built to code” from loads placed on the deck. Recommended reading for designers, architects, builders, waterproofers and anyone interested in increasing their knowledge and skills.
Q. Can deflection of a low-slope roof cause ponding? How can this be avoided?
A. Frank Woeste, P.E., professor emeritus at Virginia Tech, responds: Historically, structural designers and builders have assumed that a design slope of 1/4 inch per foot (1:48) is sufficient to prevent ponding action, thinking that the installed roofing system will maintain at least a 1:48 slope in-service as required by some roof covering systems. However, in many cases and for different reasons, ponding on limited areas of low-slope roofs is common. That’s due to roof deflection, which over time can cause water to collect in some areas of a roof where the design slope for drainage is not adequate, and in fact changes from a “positive” drainage slope to a “negative” slope (see photo below).
DOWNLOAD THE PDF VERSION OF THIS ARTICLE. (666.96 KB)
The author makes some very good points for consultants to consider… Using language that everyday people will understand. Especially when it comes to condominium boards of directors.
There are many things to consider when doing a visual inspection and certainly one of them is how bad is the degradation of concrete? Since a visual is only limited to what we can see and we don’t have x-ray vision there can certainly be damage inside of concrete that we are not aware of… Unconsolidated concrete rebar that isn’t properly tied sized etc. Hidden water damage may also exist.