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650 Sq. Ft. ADU, Stick It Or SIP It?

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Unread Today, 11:47 AM   #1
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650 Sq. Ft. ADU, Stick It Or SIP It?


I am doing the Architectural plans for a 650 sq. ft. Accessory Dwelling Unit (ADU) and the main designer on this project wants to use SIPs for walls and roof systems. Since the ADU is so small, I think that it would be better ie. less expensive overall for the same energy efficiency to stick frame it with a truss system.
It will be slab-on-grade and it is a simple rectangle with 9' ceilings. Pretty basic stuff that I can prescriptively engineer. The SIPs construction would require a licensed engineer as the house is in a seismic design category of S. I do not have any experience with SIPs so perhaps I am wrong about stick framing being the better option. I know that each system has its pros and cons but I am looking for validation from you guys for my opinion so that I can charge prescriptive engineering fees....mmmuuuuaaaahahahah!

But seriously, I think that framing it would be less hassle and better overall.

Am I wrong in your never to be humble opinions?

Andy.
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Unread Today, 01:12 PM   #2
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Re: 650 Sq. Ft. ADU, Stick It Or SIP It?


I'm assuming you're talking cost. What R values for walls and ceiling, what general location?

Normally I'd say stick. Long term repairs are also easier to deal with.

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Unread Today, 01:58 PM   #3
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Re: 650 Sq. Ft. ADU, Stick It Or SIP It?


Quote:
Originally Posted by hdavis View Post
I'm assuming you're talking cost. What R values for walls and ceiling, what general location?

Normally I'd say stick. Long term repairs are also easier to deal with.
Mostly I am asking about cost, yes.

R values will be around R-19 in walls and since this is southern California, the ceiling and the wall values can vary depending on the type of construction, types of windows (SHGC and U-factors), Heating/Cooling unit type, etc.

Ceilings will probably be around R-19 to R-38 depending all the above.

I am sure there are/will be difficuties with running electrical and plumbing etc. in SIP walls that I am not aware of.

Andy.
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Unread Today, 03:01 PM   #4
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Re: 650 Sq. Ft. ADU, Stick It Or SIP It?


Quote:
Originally Posted by ScipioAfricanus View Post
Mostly I am asking about cost, yes.



R values will be around R-19 in walls and since this is southern California, the ceiling and the wall values can vary depending on the type of construction, types of windows (SHGC and U-factors), Heating/Cooling unit type, etc.



Ceilings will probably be around R-19 to R-38 depending all the above.



I am sure there are/will be difficuties with running electrical and plumbing etc. in SIP walls that I am not aware of.



Andy.


In my experience stick framing should be more cost effective at that size
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