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December 11 - December 18, 2015

We are trying to remove an old, coal tar-based, rubberized waterproofing membrane from a concrete substrate. In some areas it pulls off and in others the adhesion is tenacious. What are some suggestions on increasing the efficiency of this process?

Selected Answers

From Guus van Wyk of sigma paints sa ltd on December 18, 2015:
Because the membrane is rubberised, hard particles blasting is no option, but you could consider CO2 blasting as the CO2 will c ool  the coating to below the glass transition tempersature.

From Richard Tomnan of Torus Solutions on December 15, 2015:
I suggest you refer to ICRI Technical Guideline 310.2-1997 on surface preparation. They offer a wide array of options to consider, including desired end results

From john schultz of o-gee paint co on December 15, 2015:
It would be helpful to know the size and orientation of such a thing as well as the desired end state and any parameters that would affect removal selection. From the sound of it, it may be a clarifying pond requiring repainting. There are a number of excellent diamond grinding systems  for removal of mastics that would likely work well in this regard. Remove the easy stuff first with water blasting and move to more aggressive measures where needed.

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