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-   -   Roofing and venting priorities (http://www.diychatroom.com/f9/roofing-venting-priorities-177816/)

Mark Harvey 04-22-2013 12:11 PM

Roofing and venting priorities
 
Is it best to have all venting, chimney and stacks in place before installing a metal roof or does it matter? My thought is that everything should be in place before roofing but I'm open to suggestions. Thanks

jagans 04-22-2013 12:23 PM

Assuming you mean a standing seam metal roof, and if you are talking about a masonry chimney, yes the masonry chimney should be in place. I would wait on plumbing stacks, so you can bring them up through the center of a panel so they don't fall on a rib. Allowance for panel movement must be provided around both stacks and chimney. The base flashing attached only to the roof, and the counter flashing attached only to the chimney.

shazapple 04-24-2013 11:14 AM

I agree with Jagans, the vent stacks are pretty easy to install after. Although, if you are strapping the roof it is nice to have everything in place so you can install strapping around the vents as well.

jagans 04-24-2013 12:33 PM

Quote:

Originally Posted by shazapple (Post 1166238)
I agree with Jagans, the vent stacks are pretty easy to install after. Although, if you are strapping the roof it is nice to have everything in place so you can install strapping around the vents as well.

Hey Shaz, what do you mean by strapping? We use the term strapping with running roll goods parallel to the slope, what is the meaning with metal roofing? Just wondered, as terms seem to differ in different locales.

Thanx

shazapple 04-24-2013 01:24 PM

Sorry for being vague. When I talk about metal roofing I'm referring to corrugated panels, which is by far the majority of metal roofs put on in my area. In some situations corrugated panels are installed directly to the deck, but in some new construction and (ideally) all replacements 1"x4" strapping is installed perpendicular to the slope. This creates a gap between the deck and metal roofing, so if you don't have strapping around your vent pipes it makes it difficult to fasten the flexible rubber boot.

jagans 04-24-2013 09:59 PM

Just to be clear, these are corrugated roofs with exposed fasteners?

Thank You.

Mark Harvey 04-24-2013 11:19 PM

Roof
 
Yes, typical metal roof with 36" width, ribbing not sure of guage.


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