Roof question

[VandelayIndustries]

Going from the peak to exterior wall is about 16’ with a 6/12 pitch. If I was to change angles at the exterior wall for a transition to a porch roof with a 2/12 pitch would that push snow off or create a snow/ice jam? Porch is 8’ wide. Metal roof. In the northeast region.

 

[Alpine 338]

I would not do that if you get a fair bit of snow in your area.

 

[Yasherka]

I'd agree with @Alpine 338. My steel building up in the Rockies only has a 2/12 pitch and it works fine but I think the transition would create an area for snow to accumulate.

 

[HiDesertELR]

Most likely, yes, you'll get an ice dam. You can use peel and stick roofing membrane 5' to the interior side of a heated wall to try and mitigate, but it's still a risk.

Alternatively, using a roof ice-melt system could help.

 

[VandelayIndustries]

Okay I’ll scrap that idea. What pitch would I need for that transition to not be a problem? I think the most I could do without dropping header too low would be a 3.5/12 pitch

 

[Alpine 338]

The more you do, the better obviously. Snow naturally slides at 30-deg ,(7/12-pitch) or greater. Anything under that and it just creeps, and will create ice dams regardless. And if you're in a wind prone area, the wind can deposit more snow in that spot creating even more problems.

 

[VandelayIndustries]

The more you do, the better obviously. Snow naturally slides at 30-deg ,(7/12-pitch) or greater. Anything under that and it just creeps, and will create ice dams regardless. And if you're in a wind prone area, the wind can deposit more snow in that spot creating even more problems.

Middle of a field on a hill. The wind never stops but it only averages 8mph. So I should just scrap the porch idea off that side all together is what it sounds like..

 

[chevy_man]

Middle of a field on a hill. The wind never stops but it only averages 8mph. So I should just scrap the porch idea off that side all together is what it sounds like..

You could do electric heat tape.

But only if you're ok paying to run a 5kw load continuously with snow.