Yes, it would be a mechanically double crimped seam.
Guest User
2017-05-09 07:31:38.000000
Thanks Todd.
Its new construction. what would be your recommended ventilation procedure ? Its a shed roof , no obstructions and a 40 ' run.
Guest User
2017-05-09 10:22:14.000000
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.
Guest User
2017-05-09 10:31:09.000000
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
Guest User
2017-05-09 11:17:40.000000
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 ?
Guest User
2017-05-29 13:06:23.000000
Thank you. I am unaware of any standing seams approved for that low pitch other than mechanically seamed standing seam roofs.
Todd Miller
2017-05-09 05:28:09.000000
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".
Todd Miller
2017-05-09 09:51:04.000000
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?
Todd Miller
2017-05-09 10:24:10.000000
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 .
Sean Fox
2017-05-08 22:52:16.000000
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.
Eric Novotny
2017-05-09 10:36:59.000000
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.
Eric Novotny
2017-05-09 11:29:59.000000
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. .
RETURN TO Is A Metal Roof Right For My House
