Sean Fox
5/8/2017
I've seen this post a lot , but I wanted to have confirmation. We have a 1/12 roof want to use standing seam with a high temp ice and water . I'm going to ask the roofing contractor for the highest seam possible preferably 1 1/2 or more and a inseam adhesive. This sound doable with everyone. Thank you all for your time .
Todd Miller
Isaiah Industries, Inc.
5/9/2017
Thank you. I am unaware of any standing seams approved for that low pitch other than mechanically seamed standing seam roofs.
Guest User
5/9/2017
Yes, it would be a mechanically double crimped seam.
Todd Miller
Isaiah Industries, Inc.
5/9/2017
That sounds like an appropriate use of the product then. Have you ever had any concerns in the past related to perhaps limited ventilation in this roof, such as ice dams or condensation? If so, then those need to be discussed with your contractor as metal roofing is not a "cure all".
Guest User
5/9/2017
Thanks Todd. Its new construction. what would be your recommended ventilation procedure ? Its a shed roof , no obstructions and a 40 ' run.
Todd Miller
Isaiah Industries, Inc.
5/9/2017
Will this be a heated space beneath it? What sort of insulation do you have? Is there any cavity at all for proper ventilation -- intake at the bottom and exhaust at the ridge?
Guest User
5/9/2017
It is a heated space. Its a great room with cathedral vault. It will be vented at the top and soffit. What's your recommended air space gap. Is more better than less. It's going to be a black or a dark gray color. We are wavering over a packed cellulose or a sprayed foam. Any thoughts on the insulation? We know the detail build up will have to be slightly different for each.
Eric Novotny
An informed customer is the Best Customer!
5/9/2017
If this is new construction, I would seriously consider treating it as a conditioned/hot attic in this case and apply some rigid foam to the exterior to help with the thermal bridging of the roof. Where is the home going to be? NY? What kind of snow load do you get there? Might want to incorporate some rigid foam and some above deck venting. This would give you the best of both worlds.
Guest User
5/9/2017
Upstate NY I believe we are zone 5. Engineer is specing snow load a 55psf Just so I'm clear on the added rigid and vent, what exactly is the build up you are suggesting? Thanks for your time Eric
Eric Novotny
An informed customer is the Best Customer!
5/9/2017
You would create a vent space above the foam via dimensional lumber, apply a secondary layer of plywood/decking, and create an intake and exhaust vent like you would on a vented design.
Guest User
5/29/2017
I'm slowly refining the plans here. The roof rafters are 14'' engineered rafters. I think we decided on closed cell to the appropriate R value. With standing seam 1 1/2 /12 pitch A few questions . I'm reading closed cell does not have to be vented ? Is this true. Thermal bridging ? Is the added expense of 2'' of foam and a whole other roof deck worth the loss by thermal bridging ?
Eric Novotny
An informed customer is the Best Customer!
5/30/2017
If you consider the fact that you can also lessen the applied depth of SPF, most times, rigid foam is not a bad investment in the roof design. Yes...once you are done with foam and/or rigid foam...the roof would be designed and installed as a conditioned (i.e. hot) or non-vented design. .

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