Closing EPDM granules in wear layer install of a PIP system

In this video you can see how a Trassig installer closes the EPDM granules. On the right hand side you can clearly see the unclosed granules looking a bit darker. Closing the granules is an industry term that literally means flattening them. an EPDM granules is jagged and has many sides. This done through the grinding process. The many edges of the granules make it easy for them to "interlock". However, you cannot let a spiky edge on the surface as it will become a weak link and foot traffic will dislodge it. Hence, closing the granules The process involves lifting one end of the lubricated trowel, and applying pressure as you are sliding back and forth on the surface.
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