My house has a roof with a 2:12 (11 degrees) slope. The manufacturer says it’s ok to use asphalt shingles, but my contractor says it isn’t. Who’s right?

There are some manufactures (and even model building codes) that will allow the application of asphalt shingle roof having that slope; however, NRCA does not recommend shingles on slopes less than 4:12 (18 degrees). Asphalt shingle roof systems are water shedding and rely on gravity and roof slope to effectively drain water off the roof.



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