Can you not use any type of polythene sheeting ? I just thought about it, maybe get too hot and burn the grass ?? Unless your father has a vented type sheeting maybe ?
That was in the mid 50s masona almost 50 years ago when polythene was new.
There was plenty of natural ventilation.
It was similar to a very large cloche and not as hot as a polytunnel.
I used turf on my own garden as there was no topsoil.
It was buried under 3' of blue clay.
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