Modern cementitious roofing products are a world away today from the poor reputation earlier products developed in the 1970’s when awareness grew of the dangers of the asbestos content in many of them.
Multi-storey car parks in the United States date back to 1918 when what is believed to have been the first was built at the Hotel La Salle at 215 West Washington Street in the West Loop area of downtown Chicago, Illinois.
Phoenix, AZ. “It’s all about adhesion, both with the coating itself and the new generation of cool topcoats. You can have a superbly aggressive coating in grip power terms, but, if it does not provide the ideal substrate for over-coating with acrylics and silicones, then it’s not right for cool roof jobs,” stated Castagra Products’ CEO, Peter Roosen.
Phoenix, AZ. “Flat roof coatings and membranes are progressively becoming more and more high tech as performance demands and expectations grow for cool, solar and green roofs,” said Castagra Products, Inc., CEO, Peter Roosen.
Phoenix, AZ. Jerry Brown, a 47-year veteran of the roofing industry says when he teaches class on roof repairs and restoration, he likens it to how we should be protecting our skin.
“The primary purpose of roof coatings in Arizona is to protect the roof from UV degradation and cool the roof. This is like you putting sun blockers on your skin to prevent damage and even skin cancer. The sun destroys roofs with its UV radiation and the heating and cooling effects of thermal shock also damage them so cool coatings, typically white, are of equal importance too.”
Arizona has the highest nationwide concentration of a flat roof material called cementitious – an acrylic and cement mix. According to local experts, there were billions of feet of cementitious roofs installed 15 to 25 years ago, and now these aging roofs are all starting to crack and fail.
Phoenix, AZ. “I never cease to be amazed at how such a thin layer of only 30 mils of veggie-plastic coating can add up to 25 years on a flat roof’s lifespan,” commented Castagra Products Inc. CEO, Peter Roosen.
“Building owners and managers want to put off, indefinitely, what actually used to be inevitable, re-roofing, which is extremely costly. Now, with some modern membranes and coatings such as ours, flat roofs can, with low cost inspection regimes, last for the life of the building itself.
Vigorous spudding can do more harm than good, especially with fragile substrates such as those often encountered with tar and gravel roofs.
Roofers are very familiar with the long-handled tool with a stiff flat blade on one end (usually 4″ or 6″ wide) that is used to scrape and remove the top surfacing of a roof down to the membrane. There are also some very powerful mechanical spudders.
Tar and gravel roofs (Built-up Roofing) have been a popular choice for many decades and generally have a 10 to 15-year lifespan in cities like San Diego. But, with the crack down on noxious fumes (VOCs), they are giving way to modern membranes and coatings, especially with the rising demand for cool roofs.
With the ever increasing performance levels of solar panels, home and building owners want their roofs to be high performance with a longevity to match or even surpass the lifespans of the electricity generating systems they support.