Mixed use building insulation question

[ceeefour]

State of Washington here.
Barn type structure with the lower floor as an A2 or A3 for hosting weddings, gatherings, reunions, and similar assembly functions.
back 1/4 of the barn has a 2nd floor apartment that will be an R1.

Both spaces are heated/conditioned. The building will have automatic fire suppression and a 1 hour floor ceiling between the apartment and the A occupancy below.

Question is this. Does the floor ceiling need to have it's own insulation and it's own thermal envelope or does the fact that the lower portion is conditioned with an envelope that meets or exceeds the requirements of the R1 satisfy the requirements?
I have exhaustively read the Washington energy code as well as the IBC and can't find anything definitive. Thanks in advance for the input.

 

[cda]

Welcome!!

 

[Francis Vineyard]

The dwelling or sleeping unit may be within the "building thermal envelope" but it will still require at least R- 11 in accordance with IBC 1207 for sound transmission.

 

[classicT]

Fellow Washingtonian here.... The minimum requirement in the WSEC is for the building thermal envelope, therefore if both areas are fully conditioned, the requirement for insulation relies upon the IBC (see Francis's post) for acoustical dampening.

However, make sure to check out C402.1.1.1 Semi-heated buildings and spaces; if the A occupancy has large barn doors that can be fixed in an open position during events (open air vibe) or owner wants to save some on energy bills, insulation may be required as if part of the building thermal envelope.

Generally speaking, if you are the owner/builder/etc., put it in - the cost is minimal for what you get in return.

 

[mark handler]

2015 Washington State Energy Code
C101.4.1 Mixed occupancy. Where a building includes both residential and commercial occupancies, each occupancy shall be separately considered and meet the applicable provisions of WSEC--Commercial Provisions or WSEC--Residential Provisions.

Yes
You need to insulate the floor/ceiling space

 

[ceeefour]

Very much appreciated. Thanks for the insights.

 

[cda]

Very much appreciated. Thanks for the insights.

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[ceeefour]

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[cda]

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[cda]

DONE!
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