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We all have seen this on a poured in place rubber surface. Especially where there are different color variations, designs, or simply a big surface that has to be done in different stages. Seams are a normal occurrent in these types of surfaces, but can become a nuisance or even worse, a tripping hazard if not dealt with the correct way. So what should you do if you see any seams separating in your playground rubber surface:
1) Do nothing, if there is not tripping hazard.
2) Fill with a seam binder if the crack is think enough (It doesn't admit a single granule)
3) If the seam is wide enough: Prime and fill with a repair kit. This is often the case on the perimeter of a playground surface where the poured in place rubber has pulled away from the bordering concrete path or wood. In this case you need to first fill the base layer first before filling the wear layer in order to maintain the impact attenuation properties of the system.
4) if one side is more elevated than the other, you might have to use an aromatic or aliphatic binder to inject underneath and along the side and then put some weight on the rubber as it is curing.
Your installer should have managed seams effectively at the time of installs. If you have to introduce a seam, try to place it under equipment. We also recommend using a staggered seam to overlap the two sides as shown in the following picture.
