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I will be adding a garage and breezeway to the eve end of my 16 year old NH (snowy winters) house with an 8/12 (25 year) asphalt shingled roof. I would like to keep the breezeway roof pitch to a minimum to leave adequate clearance for a Velux roof window. Am I asking for problems by creating valleys that are half asphalt and half metal in snow country? If not, what is the minimum pitch I should consider for the breezeway roof? I would also like to add a farmer's porch to the gable end (no roof intersection). What would the minimum recommended pitch be for the porch roof?
Please don't circulate my email address.
Thank you, Jerry
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Many of the residential metal roofing products require a 3:12 pitch. There are some products which can be used down to a 2:12. Below that, you will need to use a mechancially seamed standing seam.
As far as the valley -- I have seen that done successfully before.
7/20/2004
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Or copy this URL: https://www.metalroofing.com/spirit/comment/3486/find/