We got a review from a

In 62.1, the ventilation is required for "occupiable space" which has the follow definitions
occupiable space: an enclosed space intended for human activities, excluding those spaces intended primarily for other purposes, such as storage rooms and equipment rooms, that are only occupied occasionally and for short periods of time.

So, storage and M&E do not require ventilaiton if you claimed the definition of occupiable space. However, the corridor must have ventilation.

You should also consider exhuast ventilation for spaces such as recycle rooms, lockers, chemical storage, restrooms, etc as mentioned in table 6-4.

Marcio, Iatuwat is correct and I am glad that he beat me to it so I don't have to type out the 62.1 definition of occupiable spaces. I don't know where you got your definition from. I have never seen a review that specified time periods or room types to determine if a space is occupied. I know that USGBC defines an occupied space as a place where someone sits or stands while working. I always use the ASHRAE definition. As far as the specific answers to your questions, please see below:

1. I agree with the reviewer that ALL spaces must comply with IEQp1. The compiance method used for storage spaces is to apply the exception noted in the definition of occupiable space. Corridor ventilation is deabatable. The 62.1 user guide has some instances where it says it is not required, however, I always ventilate them per the area requirement of equation 6-1.

2. Again, IEQp1 does need to address all spaces. That is not to say that all spaces must be included in the VRP calculation. I recently went through a terribly frustrating ordeal with the recurring comment where I made a separate spreadsheet to list all of the spaces not included n the VRP calcs. The sheet listed the space name, type, area, airflow and reason for exclusion. I then wrote a letter that addressed my approach and compared the total VRP and non-included spaces with the GSF from the PI forms. I also had to noted that the space calculated for ventilation is net space, not gross which is listed in the PI forms. The numbers should come out pretty close. It's kind of ridiculous that we must go into this much detail but I don't want to have to pay the $800 appeal fee either.

I hope this has helped.

There is a regularly occupied spaces definition that sets the use at 1 hour per day. It is in the IEQ Overview section. It occurs twice. To quote the BD+C 2009 Reference Guide, and is applicable to schools;

[b]Compliant Space Types for Indoor Environmental Quality Credits[/b]
The following list identifies school spaces considered to be regularly occupied for applicability to indoor environmental quality credits. [u]In these spaces, daylight, views, thermal comfort, and/or acoustics[/u] affect the quality of occupants’ regular use.

[b]Regularly Occupied Spaces: Classroom and Core Learning[/b]
This category consists of spaces that are used for at least 1 hour per day for educational activities where the primary functions are teaching and learning:

[b]Other Regularly Occupied Spaces[/b]
This category includes all nonlearning spaces that are used by occupants for 1 or more hours per day to perform work-related activities.

NOTE: The above refers to specific credits. ASHRAE 62.1 is not one of those credits.

Thanks for the reference. To clarify my statement, I do not think that we SHOULD have to but in my experience, the LEED reviewers have become more demanding about documentation. Since they always comment on the airflow and area not being equal to schedules, I now upload a separate sheet showing all rooms not included in the VRP and why. I think it's absolutely ridiculous and it falls outside of the scope of the required documentation but it has evolved into this over time. I just go ahead and upload the documentation as a separate file.

Hi,
If you chose the other path, to upload the 62MZCalc calulations, you have the following documentation requirement: "LEED Documentation: If the sum of the area reported for all air handling units combined with the sum of all naturally ventilated spaces is less than 90% of the total gross area reported for the project, please provide a narrative documenting the non-occupiable spaces that are excluded from the calculations."
I guess this is when the reviewers ask you as well, although providing only the VRP calculation on the form.
I have two additional questions:
- Do you usually use the default ASHRAE occupancy no. for corridors (zero), or as it is occupiable, you determine a number and then use diversity so that the total number of people is not exceeded?
- Do you usually give a roombook to document the unoccupied areas, or do you think just listing the area types and the total square footage can also be enough?

Many thanks

I use zero occupants for corridors and I provide a list of individual spaces with area, type, airflow and reason why they are excluded from the VRP calculation.

Hi Andrew, It looks as though we will have to upload a similar justification for IEQp1, although where to do so is not clear. There seems to be no area for file uploads. What have you typically done in the past? Thanks

You can check either "Additional Details" box on the LEED Credit form to get access to a spot to upload a document. As long as you include a note in the text box describing what you're uploading and why, it doesn't really matter which of the two boxes you check. (You can also simply state something along the lines of you're "uploading the document here because there is no other area for file uploads.")