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Framing @ Rooftop Unit Openings

Framing @ Rooftop Unit Openings

Framing @ Rooftop Unit Openings

(OP)
This is a survey:  With steel framed roofs, do you require framing around the supply air and return air openings in addition to providing framing for the RTU itself?
Thanks

RE: Framing @ Rooftop Unit Openings

Any deck opening larger than 12" - we require supplemental framing.

RE: Framing @ Rooftop Unit Openings

Same as JAE here.

RE: Framing @ Rooftop Unit Openings

yes

RE: Framing @ Rooftop Unit Openings

Usually just call for the framing around the unit if the openings for the unit are contained within this frame, other wise it is any opening >12".

RE: Framing @ Rooftop Unit Openings

I agree with the above responses...you need to support the free edges of deck, so as not to cantilever too far beyond joist/beam.

RE: Framing @ Rooftop Unit Openings

Usually both but I see a lot of opening frames laying around the jobsites after the RTUs are in place.  Coordination of the opening must be a problem.

RE: Framing @ Rooftop Unit Openings

we usually see framing under the curb only.  The deck under the unit could be completely removed - it has no load but self-weight.  Correct?

RE: Framing @ Rooftop Unit Openings

I agree with providing frames for openings greater than 12". For deck openings between 6" and 12" we require a 16" flat plate extended 6" beyond the opening on all sides and screwed to the deck at 6" oc around the perimeter.

RE: Framing @ Rooftop Unit Openings

(OP)
MikeE55:
Here are some reasons I can think of to not remove all of the deck:
1)  Lateral support of framing members, bar joists in particular.
2)  Safety hazard during construction?  (I an not sure at what stage of unit installation they would cut the holes).
3)  Good to have as much of the roofing continuous as possible due to sound considerations?

RE: Framing @ Rooftop Unit Openings

we have a typical detail

RE: Framing @ Rooftop Unit Openings

YES

Regards,
Lutfi

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