The old garage had been converted into an office and shed with a partition wall. The carpet in the office was the filthiest I've ever seen, so I pulled it up. Underneath was a black layer, which I've now decided was roofing felt (the previous occupant was a builder). I decided to remove that as I didn't know what would happen to it in warmer weather and didn't want to be treading any black,sticky stuff around. It was a garage and had a car that leaked oil in it at some time. I now know old engine oil on concrete is a marvellous method of glueing down roofing felt!
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