Using of roof for farming
Dear Sir,
I do hope roof is done with water proofing and if not get it so that water doese not seep in. Instead of Mashroom, suggest stack some soil with manure in wooden carton/boxes and take products like spinnach, tomato, or any vegetables used daily in the house hold. Start with low and then increase. day by day you will learn the profits.
Its a nice time pass also.