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+--- Thread: Plywood on roofing now? (/showthread.php?tid=22696)
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RE: Plywood on roofing now? - BlackAkita - 08-29-2024
(08-11-2024, 08:45 PM)tikicarver: Wrote: ... when I talked to the building dept in Hilo, they said " plywood decking is required." Even after I pointed out that the code says decking is not required if the metal roof panels are rated to handle the sheer load. I figured it was not worth arguing with them and just went with the plywood, since I would have to convince the guy who drew the plans too..I've been reading this document of corrections and errata (circa 2021) from AGS:
Luckly there were 2 other guys there that day that said the first guy was wrong and the signed off my permit. I don't think it would be that easy trying to get them to approve no plywood,, because everyone is doing it.
https://ags.hawaii.gov/wp-content/uploads/2021/05/2018SBCErrataandAddenda_20210518.pdf
It contains a section covering fasteners and pull strength:
Complete load path and uplift ties.
1705.11.1 Complete Load Path and Uplift Ties. Special inspection is required for metal connectors, anchors, or fasteners for wood and cold-formed steel construction at the following locations: roof ridges, roof rafters to beam or wall supports, beams to posts, posts or walls to floor framing or foundation below, ground anchors, and all other connections that are part of the load path to resist uplift forces.
Did you have an inspector come by to inspect these items?
What standards require plywood decking? Technically, plywood on a roof seems to be needed for its pull strength, and slightly better weatherability compared to OSB, at least according to youtube. Thank you for the detailed info you are providing in this thread.
The house I have an offer on needs an As-Built blueprint and Plan due to un-permitted improvements (done 10 years ago). Back then, an added room needed a roof extension, and that's why the as-built plan now calls for plywood decking and a peel of the galvanized roofing for installation. There is no way around this forced upgrade. This was even reinforced by a DPP employee who was contacted by my draftsman. The whole permitting process is heavily reliant on what came before, and that's why normal homeowners need to reach out to experts in such situations.
RE: Plywood on roofing now? - tikicarver - 12-04-2024
My understanding the requirement for plywood decking is coming from the wind resistance requirements.
I would have to go through my notes to see if I ever found it explicitely stated...
But like I mentioned before, I don't think there is any way to get the Building Dept do let you go without it...
As for having the metal connectors inspected,,,, I have not called for my rough framing inspection yet.
I'm sure the inpsector will look for those.
But I have been installing them all per code and my plans.. Even adding some extra ones...
I have my trusses up and with be installing the decking and metal roof soon.
It has been slow going because I only get out to the property once a month.
-----------------------------
Complete load path and uplift ties.
1705.11.1 Complete Load Path and Uplift Ties. Special inspection is required for metal connectors, anchors, or fasteners for wood and cold-formed steel construction at the following locations: roof ridges, roof rafters to beam or wall supports, beams to posts, posts or walls to floor framing or foundation below, ground anchors, and all other connections that are part of the load path to resist uplift forces.
Did you have an inspector come by to inspect these items