Rolled turf - Various problems from the beginning

Under the rolled turf, 60cm of topsoil was applied? Seriously? Before or after compaction?

I believe two problems are coming together here:

1. With such a deep filling, a multi-layered soil structure would have been more sensible, whose lower layer should consist of coarser and above all crushed mineral material. The mutually "interlocked" stones prevent localized sinking. Only topsoil without rooting, at a thickness of 60cm, tends to "wash away." Turf alone cannot root and stabilize 60cm.

2. I suspect that a kind of basin has formed, filled with currently very loose topsoil. When watering (a lot of water in a short time), the upper soil absorbs little water, it flows down to the original soil, and an underground lake/marsh forms. Your 60cm of topsoil then happily floats back and forth in it, and with every step on the lawn everything shifts.

The bad thing is, this will not improve on its own in the long term either; after every rain, the mud basin is washed up again, and the surface becomes bumpier and bumpier.

My amateur solution: planting with appropriately deep-rooting shrubs, which 1. stabilize the soil and 2. pierce through the basin at the bottom so that water can also drain.

Of course, it would be better to summon the company and then have them fix it, however, that’s why you hire professionals so precisely this does not happen. (Warranty)

P.S. To check what is really going on here, I would dig a 0.5 x 0.5m deep hole at a particularly bad spot and see what’s going on. If it is loose but dry at the top and then muddy wet from 0.5m depth, the problem described above is present. The hole can then also be used as a planting pit.

Yep, 60cm topsoil would be pretty ridiculous. But I would also be surprised, that would have been quite a bit of material replacement, why should the company put in so much work. Otherwise, the lawn doesn't look bad for the current climatic conditions.

The visible areas between the strips occur when the strips are just laid next to each other and not pressed properly together. When laying, always press the strips together (including the seams), any possible waves will be rolled away anyway.

It just takes a while for the areas between the strips to grow together, but then you don’t see it anymore.

Depending on how absorbent and loose the topsoil is, the water will of course seep away again; it could be that the roots haven’t grown quickly enough yet to draw the water.

But I have also seen laid turf at our place (I think it was laid in May) that is completely brown; at my parents’ it was laid in June and is still nice and green but watered little; at a friend’s we laid it 3 weeks ago and it is also nice and green, but he waters it excessively.

Water, water, water. Mow, do not fertilize. Be patient.