Healthcare-v2009 IEQc2: Acoustic environment

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  • USGBC

    Excerpted from LEED 2009 for Healthcare

    IEQ Credit 2: Acoustic environment

    Intent

    To provide building occupants with an indoor healing environment free of intrusive or disruptive levels of sound.

    Requirements

    Design the facility to meet or exceed the sound and vibration criteria outlined in the 2010 FGI Guidelines for Design and Construction of Health Care Facilities (aka 2010 FGI Guidelines) and the reference document on which it is based, Sound and Vibration Design Guidelines for Health Care Facilities (aka 2010 SV Guidelines).

    Option 1 (1 point)
    Sound isolation

    Design sound isolation to achieve speech privacy, acoustical comfort and minimal annoyance from noise-producing sources. Consider sound levels at both the source nd receiver locations, the background sound at the receiver locations, and the occupant’s acoustical privacy and acoustical comfort needs. Speech privacy is defined as “Techniques… to render speech unintelligible to casual listeners” by ANSI T1.523-2001,Telecom Glossary 2007.

    Design the facility to meet the criteria outlined in the sections of the 2010 FGI Guidelines Table 1.2-3: Design Criteria for Minimum Sound Isolation Performance between Enclosed Rooms and Table 1.2-4 Speech Privacy for Enclosed Room and Open-Plan Spaces (2010 FGI Guidelines and 2010 SV Guidelines).

    Calculate or measure sound isolation and speech privacy descriptors achieved for representative adjacencies as necessary to confirm compliance with criteria as identified in Sections 1.2-6.1.5 and 1.2-6.1.6 (including associated sections of the Appendix) of the 2010 FGI Guidelines and the reference standard on which it is based: the SV Guidelines.

    Room noise

    Consider background sound levels generated by all building mechanical-electricalplumbing systems, air distribution systems and other facility noise sources under the purview of the project building design-construction team.

    Design the facility to meet the 2010 FGI Guidelines Table 1.2-2 Minimum-Maximum Design Criteria for Noise in representative interior rooms and spaces.

    Calculate or measure sound levels in representative rooms and spaces of each type as necessary to confirm compliance with criteria in the above referenced table using a sound level meter that conforms to ANSI S1.4 for type 1 (precision) or type 2 (general purpose) sound measurement instrumentation. For spaces not listed in Table 1.2-2, refer to the ASHRAE 2007 Handbook, Chapter 47, Sound and Vibration Control, Table 42.

    Option 2 (2 points)

    Achieve Option 1

    AND

    Acoustical finishes

    Specify materials, products systems installation details, and other design features to meet the 2010 FGI Guidelines Table 1.2-1 Design Room Sound Absorption Coefficients (including associated sections of the Appendix) and its reference the 2010 SV Guidelines.

    Calculate or measure the room average sound absorption coefficients for representative unoccupied rooms of each type in the building, as necessary, to confirm conformance with requirements for this credit.

    Site exterior noise

    Minimize the impact of site exterior noise on building facility occupants produced by all exterior noise sources—road traffic, aircraft flyovers, railroads, on-site heliports, emergency power generators during maintenance testing, outdoor facility MEP and building services equipment. Also minimize impacts on the surrounding community produced by all facility MEP equipment and activities as required to meet the lower of the local applicable codes or Table 1.2-1 of the 2010 FGI Guidelines and the supporting Table 1.3-1 of the 2010 SV Guidelines.

      Comply with the appropriate sections of the 2010 FGI Guidelines for each category:

    • Heliports – A1.3-3.6.2.2
    • Generators – 2.1-8.3.3.1
    • Mechanical Equipment – 2.1-8.2.1.1
    • Building Services – A2.2-5.3

    Measure and analyze data to determine the Exterior Noise Classification (A, B, C, or D) of the facility site. See Table A1.2a: Categorization of Health Care Facility Sites by Exterior Ambient Sound in the 2010 FGI Guidelines and Table 1.3-1 in its reference standard, the 2010 SV Guidelines.

    Design the building envelope composite STCSound transmission class (STC) is a single-number rating for the acoustic attenuation of airborne sound passing through a partition or other building element, such as a wall, roof, or door, as measured in an acoustical testing laboratory according to accepted industry practice. A higher STC rating provides more sound attenuation through a partition. (ANSI S12.60–2002) rating based on the 2010 FGI Guidelines for the Categorization of Health Care Facility Sites by Exterior Ambient Sound and analyze contract documents to show conformance with requirements for this credit.

    For Exterior Site Exposure Categories B, C or D calculate or measure the sound isolation performance of representative elements of the exterior building envelope to determine the composite sound transmission class (STCc) rating for representative façade sections as necessary. Measurements shall generally conform to the current edition of ASTMVoluntary standards development organization which creates source technical standards for materials, products, systems, and services E966 Standard Guide for Field Measurements of Airborne Sound Insulation of Building Façades and Façade Elements.

13 Comments

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Gustavo De las Heras Izquierdo Arch. Eng. LEED AP BD+C; O+M Revitaliza Consultores
May 12 2014
Guest
238 Thumbs Up

Patient room-patient room

The walls between patient rooms have a 50 STCSound transmission class (STC) is a single-number rating for the acoustic attenuation of airborne sound passing through a partition or other building element, such as a wall, roof, or door, as measured in an acoustical testing laboratory according to accepted industry practice. A higher STC rating provides more sound attenuation through a partition. (ANSI S12.60–2002) according to table 1.2-3 2010 FGI. However, our patient's rooms have been designed with NO doors. This is to provide easy and direct access for the nurses and doctors. Do we still have to meet the 45 STC isolation value?

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Susan Walter Sr Project Architect, Wilmot/Sanz May 12 2014 LEEDuser Expert 14931 Thumbs Up

I'm not sure how you'll comply with the 35 STCSound transmission class (STC) is a single-number rating for the acoustic attenuation of airborne sound passing through a partition or other building element, such as a wall, roof, or door, as measured in an acoustical testing laboratory according to accepted industry practice. A higher STC rating provides more sound attenuation through a partition. (ANSI S12.60–2002) required for patient room to corridor with your design situation. But I would say that you still need to follow the FGI unless your project is outside the USA and following a similar standard that you can get an ACP on from the USGBC.

The way I read the FGI table, you need 50 STC between patient room and the patient room above, 45 STC patient room to patient room (common wall) and 35 STC from the patient room to the corridor (common wall again). The 35 is measured with a closed door.

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Gustavo De las Heras Izquierdo Arch. Eng. LEED AP BD+C; O+M, Revitaliza Consultores May 12 2014 Guest 238 Thumbs Up

Thanks for your insight. Yes, the project is located outside the US and we will try to get the ACP from the USGBC.

I was wondering whether or not it is mandatory to have floor-to-floor walls in order to meet the isolation values stated in the table 1.2-3. It is quite difficult having floor-to-floor walls due to the amount of services crossing above the rooms.

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Susan Walter Sr Project Architect, Wilmot/Sanz May 12 2014 LEEDuser Expert 14931 Thumbs Up

It is pretty much the only way that will get you the STCSound transmission class (STC) is a single-number rating for the acoustic attenuation of airborne sound passing through a partition or other building element, such as a wall, roof, or door, as measured in an acoustical testing laboratory according to accepted industry practice. A higher STC rating provides more sound attenuation through a partition. (ANSI S12.60–2002) levels they require. Teams have tried the layer on insulation over the top of wall but never works for very long. You could also look at increasing the ceiling STC to help. We've also had discussions about only taking one layer of gyp to the deck and the other one partial height. The problem is finding accurate testing. Most design teams try to keep the services in the corridors and poke through the corridor wall. Typically, you only find exhaust running across the patient rooms and maybe return air in the patient room.

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Gustavo De las Heras Izquierdo Arch. Eng. LEED AP BD+C; O+M Revitaliza Consultores
May 12 2014
Guest
238 Thumbs Up

Table 1.2-3 - 2010FGI

"2010 FGI - Table 1.2-3" states sound isolation values for different space types. We don't know under which category would the tomography computerised room fall. We don't think it should fall under MRI category because TC is not a source of noise.

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Susan Walter Sr Project Architect, Wilmot/Sanz May 12 2014 LEEDuser Expert 14931 Thumbs Up

Personally, I find the FGI standards very weak on the different acoustic situations found in most hospitals. They further compound this by not clarifying or providing guidance to project teams wanting to address acoustics. But enough about that.

Your CT won't be as loud as a MRI machine; it also will not require a similar heavy wall / floor construction as an MRI. They are too different even though they both are in radiology. I would consider the CT to be a Treatment room.

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BABAR MEHMOOD SAUD CONSULT
May 07 2013
Guest
376 Thumbs Up

Requirements clarification

What i understand from this credit is it has 2 portions. On is regarding the sound isolation alongwith the room noise and additional points will be given if comply with the acoustical finishes.
The other part is the Site exterior noise.
Do we have to comply with both parts. If we can comply with the first part that is the "sound isolation and room background noise", do we comply with this credit. Thanks

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Susan Walter Sr Project Architect, Wilmot/Sanz May 08 2013 LEEDuser Expert 14931 Thumbs Up

Site exterior noise is optional as I read the RG. I did a test on my form for just Option 2 and it looks like you can document just Option 2. But I am not going to the exterior noise credit on my current project.

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Catherine Blakemore Architect, LEED AP BC+D HOLT Architects
Apr 30 2013
LEEDuser Member
1410 Thumbs Up

Form Questions

Tables IEQc2-1 and IEQc2-2:
- Does each room/space get listed?
- How are storage and mechanical rooms to categorized?

Table IEQc2-1:
When Space Type "Public Space" is selected, the automatic default for Adjacency is "MRI Room." I do not have an MRI room in the project!!!

Why does the "Adjacency" column provide such limited selections?

How does a space get treated when it has multiply adjacencies?

Table IEQc2-3:
The 2nd floor is future-fit out space to be determine/developed by the Owner. It will probably have medical treatment spaces of some kind along with some office space. What space type should it be assigned?

Should an OR room be categorized as "treatment room"

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Susan Walter Sr Project Architect, Wilmot/Sanz May 08 2013 LEEDuser Expert 14931 Thumbs Up

I think you can lump similar rooms together as long as the wall design is an equal. Exam rooms would get listed twice, once for an exam to exam room adjacency and a second time for an exam to corridor adjacency.

It appears that the form is mirroring the FGI chart. If you don't have that adjacency, you don't have to report it would be my interpretation. This doesn't seem rigorous to me and your design probably is better. Can you use the uploaded documents to clarify the design?

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BABAR MEHMOOD SAUD CONSULT May 17 2013 Guest 376 Thumbs Up

Thanks or the clarification. If we puresue for the option 2 , for instance we checked and clculated the site exterior site noise. After 1 year a new road is constructed/ modified near the site or building services modified. Then what will be the solution for the future changes, the values will be recalculated in this case??? Thanks

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Catherine Blakemore Architect, LEED AP BC+D HOLT Architects
Apr 05 2013
LEEDuser Member
1410 Thumbs Up

Space listings & supporting documentation

I am not familiar with this credit so bare with me.

Does each space (room) have be be listed on the IEQc2 form?

Is there spread sheet format that can be used?

Any recommendations will be greatly appreciated.

Thanks.

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Bryan Waters Architectural Intern, WHR Architects May 07 2013 Guest 382 Thumbs Up

My understanding is that the spaces listed in the FGI Guidelines and the Sound and Vibration Design Guidelines for Healthcare Facilities are the ones that have to be treated. Spaces like patient rooms, exam rooms, NICU, offices, auditoriums, lobbies, nurses’ stations are listed in both guides. A good Acoustic Engineering consultant would be familiar with them.

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Oct 25 2014
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