My coop of three years is having serious issues. The roof, made of chipboard and covered with shingles started leaking a last spring. I repaired it during our dry spell and everything seemed OK. But after our recent snowstorm and fast snow melt, the thing is leaking with a vengeance. So far, the ladies and the nesting box are dry, but needless to say, a re roof is in order. I was thinking of installing metal roof over the shingles using wafer panels like these: http://www.homedepot.com/h_d1/N-5yc...splay?langId=-1&storeId=10051&catalogId=10053 or these ones: http://www.homedepot.com/h_d1/N-5yc...splay?langId=-1&storeId=10051&catalogId=10053 What do you folks think of these material. Is there any other material that would work better than my shingles/this combo? The present roof is five feet by four feet with a single slope.