Hi Aggie
You may find that the hog house has a slightly sloping roof. Mine look more or less flat, but are in fact sloping. It shouldn’t be completely flat, that wouldn’t be a very sensible way to build it. But if it does turn out to be completely flat, I would just place it not completely flat, so that the water would still run off. (i.e. maybe a cm. higher one side than the other). If the hogs are making a nest, they will soon even that out inside. It should also already have ventilation holes in it.
The only thing about feeding out the front of your house is to bear in mind the road situation. I had a similar situation. Some of the hogs used to go through the garden a couple of doors down to get here, but some come from the other side as well. Probably most now. I have in the past thought about feeding out the front as well, but decided not to in case it encouraged them to cross the road.
