Roof Underlayment Types for Standing Seam Metal Installs

What type of roof underlayment is best for your standing seam metal roofing installation?

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An effective underlayment helps protect your home or building before installation of your roof, during the installation process, and acts as a secondary defense after your roof is finished.

In this episode of the Standing Seam Metal Roofing Accessories Series, Thad Barnette discusses different types of roof underlayment, which type is best for standing seam metal roofing, and basic installation tips. He also covers energy saving products such as radiant barrier and air gap assemblies.

Please note the installation methods shown in this video are for reference only. Sheffield Metals recommends following manufacturer's instructions for installation.

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[richdobbs]

It seems to me that the radiant barrier could be installed between the wooden batten layers, to provide a backup bulk water layer, while still preserving drying of the insulation and cooling of the underside of metal panels. What do you think? I'm thinking about a roof slope of 5:12, with the location being Northern Idaho. Putting the battens on a 45 degree slope.

[willbass]

Thx for link to Matt's video.

Also, is the radiant barrier applied over the Sharkskin peel and stick or is it a separate, stand-alone, product?
Thanks

[carlosbourdet]

Hello Thad, I'm curious if the dimple matt contributes or oil caning? Also, you would only use a dimple matt over a deck, right? (not purlins). Additionally, I'm looking to install a metal roof on an outside gazebo that will be open underneath. The plan is to attach the roof to purlins, but I'm concerned about condensation forming underneath the panel and dripping down from the underside of the roof. Should I use a synthetic underlayment between the metal and purlins?

[chrisschyf]

Here's one for you, i have a metal roof installed on the wood straps/furrings only. there is no plywood or other material between the metal roof and the open attic. So when we hit spring and fall season what I see is a lot of condensation on the underside of the roof, which then sometimes drips into the insulation or if i'm lucky runs down to the metal soffit and exits out. Can you suggest what i could install on the underside of the furrings to help keep water out of attic insulation area and have it always run down to exit via soffit area. I was thinking the metal bubble insulation - thermal roll. your thoughts....