Originally posted by Kefir:

So, I have just buildt my home, it is not that large and it is 3 rooms. I have a roof and walls and a fireplace in every room but I keep getting exposed and almost every tile of flooring and roofing is detoriating.... I build this in an meadow biome, oh and yes it is raining so I am getting wet in my own home with walls and roofs....

Do you have any mods installed?
Are you sure your roof is locked together correctly?
A screen shot would help us help you.