Plaster Delamination / Broken Plaster/ Calcium Nodules/
delamination is also known as a "Pop Off".
A Pop Off is a section of plaster that has delaminated from its substrate creating
a void between the plaster and gunite (or bond coat) and eventually
In simple terms, they look like little moon craters.
I repair pop offs and will remove unsightly calcium nodules without draining the pool.
Please see below for detailed info and photos.
Pop offs occur when cavities or voids form beneath a pool's plaster surface, despite the best efforts of the plasterer. Although this process is not completely understood, voids can be caused by a number of things, including plaster shrinkage, cracks, bad bond coats, and hollow spots between pool fixtures and the plaster. When the void fills with water, a process is set in motion as the water mixes with calcium hydroxide in the plaster. This results in volcano-like bumps or mounds on the floors and walls of your pool, This is a classic indicator of delamination. These "bumps" are referred to as Calcium Nodules. Calcium nodules are the first sign of delamination.
The plaster beneath these calcium nodules is delaminating. Eventually, the delamination breaks (or "pops"), leaving holes in the plaster with very sharp edges. Many people describe them looking like moon craters.
I find that most pop offs occur in replastered pools. Most of these pools are plaster over
plaster. If the plaster company has not prepared the pool properly before
replaster, pop offs are more likely!
For this reason I prefer "chipping out" all existing plaster down to the gunite before resurfacing. There are companies in our area that will chip out and there are companies that will not. If you are replastering, be sure and ask me!
Click here for a great article on Calcium Nodules from poolhelp.com
Don't Drain your Pool !
Mike the Poolman can repair pop offs without draining your pool. I will cut out pop offs down to the gunite and patch to match your existing plaster. All work is done underwater without draining your pool.
Please send us an email (above) to contact us.
The following are photos of Calcium Nodules. As the nodules grow they fill with calcium hydroxide and separate from the gunite (or more likely, the previous plaster). They form small cracks and rise into up into volcano-like mounds. When someone steps on the hollow void or the pool cleaner runs over it, it "pops off".
We sand off the nodules to slow the process and make them less unsightly.
Mike the Poolman
705 East Bidwell Street, 2-299 Folsom, California 95630
(916) 985-7665 or 484-7665