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Addition - existing components

H

Hyrax4978

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Nov 28, 2016
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238
Location
Hartford, CT
Reading chapter 11 of the IEBC having a tough time discerning what might need to be done to the existing building.
1101.1 : An addition to a building or structure shall comply with the International Codes as adopted for new construction without requiring the existing building or structure to comply with any requirements of those codes or of these provisions, except as required by this chapter. Where an addition impacts the existing building or structure, that portion shall comply with this code.

looking at a building that exists that has a small portion that is three stories. but a larger portion (9,000 sf) is only two stories, ground and third floor. the client would like to add a second floor between the ground and third, plenty of room. because there is a portion of existing building that is already three stories i am looking to see what i may need to do to this existing area to accommodate the new floor area. based on the IEBC its classified as an addition, and the new area needs to comply with the IBC.

What i am wondering is where does the code tell me how to handle the existing stairs in the existing three story area. do they need to meet the full IBC because of the new addition/area, or do they just need to comply with the IEBC which looks like it could be just a smoke enclosure. I would think it would need to meet the full IBC, but 1101.1 is a bit confusing to this.

Thank you,
 
I would agree with that, just trying to find how to definitively point to that in the text where the client wants to spend as little money as possible. The part of 1101.1 that i am struggling with is "without requiring the existing building or structure to comply with any requirements of those codes except as required by this chapter. Where an addition impacts the existing building or structure, that portion shall comply with this code.
 
I read that to say, "Where an addition impacts the existing building or structure, that portion shall comply with this code" and this code is the IEBC which has lesser requirements then the IBC.
 

And where you add more people you can say you are increasing the risk so making it less safe and go here:​

701.2​

An existing building or portion thereof shall not be altered such that the building becomes less safe than its existing condition.

Exception: Where the current level of safety or sanitation is proposed to be reduced, the portion altered shall conform to the requirements of the International Building Code
 
Thank you, i will put forth that section as well. This is so early we don't have any plans yet. just trying to get a game plan together that doesn't end up with an about face due to something popping up out of nowhere later.
 
Are you going to add a landing off the existing stairs to serve the 2nd floor, or a new set?
 
well right now there is a small second floor for that portion of the building(a small portion of the building is three floors already, but the majority only has a ground floor and the upper story, 2nd in this area, is at the third floor elevation) so there is a landing and small second floor area already. we would have to modify the space to allow egress through the space and to the stairwell. In my mind the new second floor area is classified as an addition, and therefor needs to be fully IBC compliant. thats how i am starting this. until i did in more later or find something else, that is how i will assume it for now.
 
I think you have to read all of the sections at the same time…this supplements it:

1101.2​

An addition shall not create or extend any nonconformity in the existing building to which the addition is being made with regard to accessibility, structural strength, fire safety, means of egress or the capacity of mechanical, plumbing or electrical systems.
 
The exit stairs serving the addition must comply with the IBC for new construction.

I don't think this is at all confusing.

I'm having a very difficult time picturing a building that has a major portion that has a first and third floor but no second floor. It would be very helpful if you would provide some sort of graphic depiction.

What I get from your description:

╔════════════════════════════════╗
║ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
╠═══════╦════════════════════════╝
║. . . . . . . . . . . ║ <====== Addition ============>
╠═══════╩════════════════════════╗
║. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
╚════════════════════════════════╝
 
Yankee, that is 100% exactly like what we have. under the "addition" area there is no floor assembly right now, so the ground floor is a two story open space and they want to build a floor assembly in line with the small second floor area just as you show it.
 
I agree that any exit stairs serving the new floor addition should be 100% compliant, just trying to find definitive text as the client doesn't want to upgrade the existing stairs/exits. the building is old and they are not enclosed. so in my mind they won't fly. i think the best i will find in the code is using 1101.1 in conjunction with 1101.2.
 
Hyrax4978 said:
Yankee, that is 100% exactly like what we have. under the "addition" area there is no floor assembly right now, so the ground floor is a two story open space and they want to build a floor assembly in line with the small second floor area just as you show it.
Click to expand...

This description does not match what you originally posted, and it does not match my sketch. What you are describing now sounds more like this is the existing condition:


╔════════════════════════════════╗
║ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
╠═══════╦════════════════════════╝
║. . . . . . . . . . . ║ <====== Addition ============>
╠═══════╣
║. . . . . . . . . .. .║
╚═══════╝

Or is this what you have now?

╔════════════════════════════════╗
║. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . .║
╠═══════╦════════════════════════╣
║. . . . . . . . . . . ║. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
╠═══════╣. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
║. . . . . . . . . . . ║ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .║
╚═══════╩════════════════════════╝

Whatever the existing configuration is, if you increase the floor area the new space is an addition and it has to conform to IBC requirements for new construction, including number of means of egress and fire-resistance ratings for exit stair enclosures.

It really would help if you could provide a link to at least a sketch of what the existing building section looks like.
 
Per CT amendments to the IEBC those existing stairs and the entire (existing) means of egress need to comply with the CT Fire code, and the fire code is retro active.

(CT Add) 101.10 Means of egress. In addition to the requirements of this code, means of egress in existing buildings shall meet the requirements of the 2022 Connecticut State Fire Prevention Code for the proposed occupancy.

(CT Add) 704.4 Minimum standards. In addition to the requirements of this code, means of egress in existing buildings shall meet the requirements of the 2022 Connecticut State Fire Prevention Code for the proposed occupancy.
 
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