Houses had thatched roofs-thick straw, piled high-with no wood underneath. It was the only place for animals to get warm, so all the dogs, cats and other small animals (mice, bugs) lived in the roof. When it rained it became slippery and sometimes the animals would slip and fall off the roof, thus came the saying, "It's raining cats and dogs."
There was nothing to stop things from falling into the house either. This posed a real problem in the bedroom where bugs and other droppings could really mess up your nice clean bed. Hence, a bed with big posts and a sheet hung over the top afforded some protection. That's how canopy beds came into existence.
The floor was dirt. Only the wealthy had something other than dirt, hence the saying "dirt poor." The wealthy had slate floors that would get slippery in the winter when wet, so they spread thresh (straw) on the floor to help keep their footing. As the winter wore on, they kept adding more thresh until when you opened the door it would all start slipping outside. A piece of wood was placed in the entranceway creating a "thresh hold."
In those old days, they cooked in the kitchen with a big kettle that always hung over the fire. Every day they lighted the fire and added things to the pot. They ate mostly vegetables without much meat. They would eat the stew for dinner, leaving leftovers in the pot to get cold overnight, then start over the next day. Often times the kettle contained the same stew for quite a while, hence the rhyme, "peas porridge hot, peas porridge cold, peas porridge in the pot nine days old."