If your roof rafters are equal to today's 2x6's (which are actually an inch and a half by five and a half) -incidentally a 1950's Pittsburgh home almost undoubtedly has such, it is unimaginable that Ondura over two layers would be any strain whatsoever with two shingle layers. Unless your rafters are badly rotted or termited to the hilt, you will will find they are far harder than today's lumber. Your rafters are probably made of poplar which is yet evn stronger. But even if they are pine, (like today's rafters), if they are of the size as I stated, I would not trust another word of those contractors. My house too is 1940's with 2700 sq ft of roof with 2x6 rafters and 30" overhangs. The roof doesn't even know it's up there. |
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