Prior to installing synthetic turf on roof tops and balconies you must understand that proper drainage must be acknowledged. Some areas might not be sloped properly for rain water to exit. If there is no proper drainage, standing water can cause the synthetic turf system to fail and deplete its longevity.
Lay out of the system is critical. If the lay out requires seaming multiple sections, I recommend starting then placement of synthetic turf sections at the edge of the roof top or exterior wall of the balcony. It is better to have seams in the middle of the areas than having them close to the edges for integrity purposes.
Once you have your complete lay out and roll cut dimensions, you may move on to the next step of placing the underlayment of SGW Drain Core.
When establishing your lay out of the SGW Drain Core, I recommend placing SGW Drain Core starting from the exterior edge then work to the middle. This will allow all cuts to be made away from all edges and provide safety working the edge of the roof top. It will allow the cuts to be easier when placing on balconies.