human
No you don't. Every carpenter in town has tried his hand on that roof, and made it worse than before. The only way to make it tight is to re-shingle it all over. That'll cost you $67.50, unless the scantling is too rotten to hold the nails, in which case the job'll cost you $18.75 more. I guess the rafters are strong enough to hold together a year or two longer.