A good example is this BH in Kepala Batas, Butterworth, Penang.
During my recent visit I saw these zinc roof materials plus those woods that were used as the roof supporting materials.
Upon checking with the owner he claimed that the roof, during a heavy thunderstorm, were lifted to the air in total and crashed on the ground.
That was about 10 months or one year ago.
A new roof was erected however those old roof materials were left on the ground breeding more often than not since it is in the middle of a paddy field, rats and maybe snakes.
Not to mention those crawlers and ants.
I would say that this is not a very good thing to do.
These rats, snakes, ants and crawlers are not welcome into your BH.
I need to get the owner to clear the items and perhaps burn all those woods at night.
You have a good look at what I saw and tell me if your are also doing simply the same thing.