Commercial screen porch / construction classification

[squaredrive]

Overview:

-State code based on IBC 2012
-50,000 SF daycare / Pre-K facility - 1 story building
-Greater than 60' open space surrounding all sides of building
-Steel frame structure
-unseparated mixed use occupancy - A-3 is the most restrictive occupancy

Owner wants to put a screen porch on +/- 40% of the building, outside all of the classrooms. Classrooms require 2nd means of egress which would go through the screen porch to the exterior.

Trying to determine if there is a construction classification approach (other than type V which will not get us enough SF) that would allow the use of non fire treated (combustible) wood to frame the insect screen / porch framing. Wood would only support the screen porch and host the door to the exterior. The roof of the porch will be an overhang that's part of the steel frame structure. I believe type IIIB would work if we use fire treated wood but we are trying to avoid that due to the presence of children and toxicity related to fire treating the wood.

appreciate any thoughts -

 

[cda]

And I take it you are going to sprinkle this area?

 

[cda]

And is the ahj or anyone else that regulates day care, going to allow exiting through the screened area??

 

[cda]

Just had a class will have to look at the notes

Type IV??

Glulam or "CLT"


http://www.woodworks.org/wp-content/uploads/Exposing-Potential-Heavy-Timber-Construction.pdf

 

[north star]

@ = @

Should this facility be designated an "E Occupancy "
[ " Pre-K " ] ?

@ = @

 

[cda]

@ = @

Should this facility be designated an "E Occupancy "
[ " Pre-K " ] ?

@ = @

Good catch

E with assembly rooms, but still an E

Unless something else is going on in the building.

 

[squaredrive]

Thanks for the input. To answer some questions - there are other assembly spaces which are dictating the A-3. Also, yes, exterior porch (and entire building) is sprinklered.

 

[cda]

Thanks for the input. To answer some questions - there are other assembly spaces which are dictating the A-3. Also, yes, exterior porch (and entire building) is sprinklered.

But are the assembly areas part of the E?

Like a grade school with auditorium? Which than is considered all as an E.

 

[squaredrive]

it's actually a separate function in the facility - adult training rooms. May be worth reexamining as there are some favorable aspects of considering the whole thing as an "E" but not sure it has much bearing on the screen porch issue...

 

[cda]

Adult training ,,,,, B Occupancy???

 

[squaredrive]

Adult training ,,,,, B Occupancy???

yes, a portion of the facility is B, with an A-3 training room for 80ish people. We could look at separating the A-3 space but can't find a logic mixing occupancy and construction type which allows us to achieve our goal of using a combustible wood for the porches.I was looking at type IIIB but, is a combustible exterior facade an option with this classification if we are beyond 60' surrounding the building? That gives us a required exterior wall rating of 0 but the language of IIIB specifically says that fire-treated wood can be used for exterior walls below 2 hr ratings and does not include language allowing combustible materials.

 

[cda]

The A cannot be accessory to one of the major uses??

 

[mark handler]

Adult training ,,,,, B Occupancy???

Based on sq ft from origin post, too big for a "B"

 

[cda]

Based on sq ft from origin post, too big for a "B"

He has not broken down how the building is divided up.

Keep getting bits and bacon.

 

[mark handler]

Main building is approximately 50, 000 sf
Based on original post
Screened porch 40 %====== which is approximately 20, 000 sf

 

[squaredrive]

He has not broken down how the building is divided up.

Keep getting bits and bacon.

i can provide more details - it's approximately 35000 sf dedicated to type E functions, 15000 sf dedicated to B functions (adult training which includes offices, and an assembly space. planning for all to be unseparated.

The reason i haven't dwelled on the occupancy is that I'm trying to just find a logic, any logic that allows me to include a combustible material on the facade. I haven't found provisions that would allow this for an E or B building but not an A-3 building, so it doesn't seem like the biggest driver. We could separate the A-3 or potentially look at it as accessory but I'm not sure how that helps with the screen porches. I'd love it if I'm missingn something obvious because I understand that there are a number of approaches we could take to the A-3 space.

 

[north star]

@ ~ @

squaredrive,

We are trying to assist you with your problem.
Please help us to help you !

Is it possible for you to provide a floor-plan view
of this building, and either (1) cut & paste it on
to this Forum, or (2) send it via a Private Message
to one of the Sawhorse members on here, and
allow one of us to paste it on to the Forum ?

Thanks !

@ ~ @

 

[JBI]

Being from NYS I'm a little confused about a lot of things on this post...
First of all, NYS did not adopt the 2012 IBC and as of the original posting NYS is currently using the 2015 IBC as modified by the 2016 Uniform Code Supplement.
Assuming a typo in the OP (I know, I know...), have you contacted the Regional Office of NYS DOS DBSC?
Has the local AHJ provided any input?
Are you an AHJ or a Design Professional, or other?

 

[steveray]

Build it with steel, clad it in wood?