I just want to say, "Dude, what the heck?! If you have that many planks, then fix the roof properly!"
All you need to do is line the planks up outside the roof and hammer the nails down against the intact part of the roof. Sure it's not perfect, but it's better than the  X thing you're doing! That thing will let in not only rain and snow, even a snake can get in. That's for barricading the house, doesn't even qualify as temporary fix.
Fuh. Rant over. Now onwards to the next chapter.