A drainage mat is most useful where water needs additional space to move laterally beneath the turf toward a drain or open edge. Typical applications include balconies, rooftops, pet areas, and other hard surfaces exposed to frequent moisture.
However, adding a drainage mat does not automatically solve a drainage problem. If water already pools on the bare slab, the slope or drainage outlet should be corrected first.
Moisture Considerations for Indoor Concrete
Indoor concrete requires a different moisture check from an outdoor patio. Before installing adhesive, padding, or backed turf, confirm that the slab moisture condition is compatible with the selected turf system, underlay, and adhesive.
A moisture barrier should not automatically be added above every concrete slab. Whether one is required depends on the slab construction, moisture conditions, and installation system being used.
How to Handle Concrete Expansion and Movement Joints
Existing concrete movement or expansion joints should not simply be ignored or rigidly bridged without considering how the slab is designed to move.
Before fixing the underlay and turf, identify these joints and follow the recommendations of the underlay, adhesive, and flooring system being used. The objective is to keep the turf surface smooth without restricting necessary slab movement or creating a weak line underneath the finished surface.
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