IRC Table R301.2 To include or not to include in plans?

[SDS]

IRC Table R301.2 Climatic and Geographic Design Criteria

When this first came out I added it to my plans, including the completed info for each project, to save the reviewer a bit of time.

When it got expanded upon in later code cycles, I continued to include it, but left it blank as the code requires...allowing the plan reviewer to add the data to the table, rather than myself.

Now I'm updating plans for the 2021 code cycle and I'm wondering if I should omit the table altogether and leave it entirely up to the plan reviewer?

My question is, what is the norm...do designers provide the blank table in plan and the reviewer fills it in, as per code? Or do plan reviewers have a stamp of the table they apply to plans and fill in the info?

Maybe a dumb question? but it has never come up, one way or the other, in a plan review so I'm in the dark as to how it is preferred.

 

[classicT]

The AHJ is supposed to complete the table as part of the code adoption process. The adopting ordinance should theoretically include the table with the appropriate values included. I've seen some AHJ do this correctly, but I have also seen quite a few provide it via a handout from the Building Dept.

Note that it should not be completed during review, as you should absolutely know the values prior to beginning the design.

 

[classicT]

Also....

Take note of the footnotes to Table R301.2. "The jurisdiction shall fill in this part of the table..."

 

[SDS]

The AHJ is supposed to complete the table as part of the code adoption process. The adopting ordinance should theoretically include the table with the appropriate values included. I've seen some AHJ do this correctly, but I have also seen quite a few provide it via a handout from the Building Dept.

Note that it should not be completed during review, as you should absolutely know the values prior to beginning the design.

Thanks for the info, yes back when they first introduced the table it was quite difficult to verify the info as most AHJ weren't up to speed on posting the info online. It is much easier to do now days as most provide it in some form though you might have to dig for it.

Note that it should not be completed during review, as you should absolutely know the values prior to beginning the design.

That is why I used to provide the table, already filled in, however...

Also....

Take note of the footnotes to Table R301.2. "The jurisdiction shall fill in this part of the table..."

The footnotes are the reason I'm questioning...to me they mean the table is to be provided in plan, blank, so the local building official can fill it in during review.

I never understood why the table is to be completed during review and not when the plans were created as the designer has to know this info to properly design the home. I have been leaving the table blank "for the jurisdiction to fill in" the last few years although I do provide wind, seismic and loading elsewhere in plan regardless...the engineers need to know that before the plan reviewer after all.

It sounds like I still need to provide the blank table to be filled in by the locals, I was just wondering if this was something that was simply stamped and filled in locally, or if it was common for plans to include the table, completed or otherwise.

 

[jar546]

The information is needed in order to design so I don't see how it makes sense for the AHJ to fill in those blanks. The designer should inquire to the AHJ as to the values for the jurisdiction that they work in prior to design. Some of the values are easily found in the IRC, others may have to be received from the AHJ.

 

[mtlogcabin]

The IRC is a prescriptive code. It is the jurisdictions responsibility to fill out the table as part of the adopting ordinance

 

[SDS]

The IRC is a prescriptive code. It is the jurisdictions responsibility to fill out the table as part of the adopting ordinance

View attachment 10311

Correct...now, my question is...

Who provides the table?

Do plan reviewers stamp it on the plans at review and fill in the info?

or

Do designers (normally) provide a blank table within the plans that the plan reviewer fills out on review?

The code does not state WHO provides the table...only who fills it out.

 

[mtlogcabin]

It is on my website under design criteria and we verify the information is on the plans. I have never seen the table on a set of drawings.
The information is located on different sheets.

 

[steveray]

We don't get anything on residential and it is typically wrong on commercial from out of state designers....Usually located on the S sheets

 

[jar546]

The designers must design to Table R301.2(1) which is declared by the AHJ. The designer has to find out what values the jurisdiction uses and then design to that criteria. I still don't understand the issue here.

 

[jar546]

This is an interior renovation so only some of the info in the table is necessary so the designer declares info such as this:

 

[SDS]

I have never seen the table on a set of drawings.

We don't get anything on residential and it is typically wrong on commercial from out of state designers

This is what I am questioning. So IF the designer does not provide the table in the plans....as a plan reviewer, what do you do?

Do you write it up as a plan review item requesting the designer add the (blank) table, so that as the official you can fill the info in as per code?

or do you simply stamp a table onto the plans and fill in the info as the code dictates?

From the above to comments I get the impression that designers do not provide the table, and when they do it is filled in incorrectly.

The designers must design to Table R301.2(1) which is declared by the AHJ. The designer has to find out what values the jurisdiction uses and then design to that criteria. I still don't understand the issue here.

Yes, understood that designers must design to table R301.2 I understand how what, why, when and where the info is to be used for.

Perhaps I am asking the wrong question.

Question: Is Table R301.2 required to be included within the plans (filled in with correct data) at the time of submitting plans for permit?

The code is entirely unclear on this point...only that the AHJ provides the data to be used.

 

[Sifu]

Question: Is Table R301.2 required to be included within the plans (filled in with correct data) at the time of submitting plans for permit?

Simple: No.

All of the information required to be determined by the AHJ for t301.2(1) must be used in the design, and will typically be illustrated in graphic or written detail. For example, if t301.2(1) has a "Y" under the "Ice barrier underlayment required" heading, then somewhere (roof plan, soffit details, written notation) the ice barrier should be shown.

Could the table be included in the plans? Yes. I very rarely see it.

 

[steveray]

This is what I am questioning. So IF the designer does not provide the table in the plans....as a plan reviewer, what do you do?

Do you write it up as a plan review item requesting the designer add the (blank) table, so that as the official you can fill the info in as per code?

or do you simply stamp a table onto the plans and fill in the info as the code dictates?

From the above to comments I get the impression that designers do not provide the table, and when they do it is filled in incorrectly.

We review to the proper values...not hard on residential......On commercial we verify they used the correct values, which they usually state on the structural plans.

 

[mtlogcabin]

This is what I am questioning. So IF the designer does not provide the table in the plans....as a plan reviewer, what do you do?

Ask them to provide the design values they used.
It may be above the minimum values the AHJ requires.

 

[jar546]

Is Table R301.2 required to be included within the plans (filled in with correct data) at the time of submitting plans for permit?

If what you are designing has factors that must be taken into consideration then yes, you include that information.

If you are remodeling the interior of a home, then no need to put footer frost depth requirements. If you are adding on an addition, they you would put that. If you are remodeling a kitchen with no change of windows or doors or walls then we don't care what wind zone you are in. It is common sense.

If you are building a new building, they you should list all of this information on your plans top declare your design criteria. You don't have to post the actual table, just the relevant info for design.

 

[Paul Sweet]

Every jurisdiction should have this table filled in for their jurisdiction, and plan reviewers should refer to it when reviewing a set of drawings. Some jurisdictions will put it on-line, in others you will have to ask for a copy. If you're near mountains the snow load might vary depending where you are in the county.

ASCE has recently made their Hazard Tool available for free public access. This gives you site-specific snow, wind, seismic, etc. loads.

ASCE 7 Hazard Tool

Quickly retrieve site structural design parameters specified by ASCE 7-10, ASCE 7-16, and ASCE 7-20, including wind, seismic, snow, ice, rain, flood, tsunami, and tornado.

asce7hazardtool.online

I usually put the structural loads & information on the framing drawings, and the HVAC design conditions on the HVAC drawings.