HGC Engineering offers consultation services relating to acoustics, noise and vibration at all stages of a project

During Planning

Environmental Noise and Vibration Studies

These feasibility studies examine the noise impact of nearby roads, highways, rail and subway traffic on the proposed site and its future occupants. As well, the study assesses the potential effects of vibration from adjacent subway or railway lines on a building’s foundation and structure. A study will also look at surrounding industries, buildings or activities nearby for potential stationary sources of noise or vibration that might impact the planned site. Additionally, we will review any early details the project team can provide on the site plans, looking for new noise and vibration sources associated with the design such as such as cooling towers, heating plants, loading bays, generators, helipads, that may in turn impact surrounding buildings and environments. These aspects are considered in a preliminary fashion in the context of a study and only general recommendations for mitigation of environmental noise and vibration are offered at this juncture.

At this Planning Stage we also offer:

• Expert Testimony for municipal hearings
• Peer Review
• Acoustic Design Spec and Brief for Design/Build RFP

During Building Design

We review the internal design of the building and its systems in order to provide acoustical guidance and recommendations to the architectural, mechanical, and electrical members of the team, with appropriate follow-up through construction.

1. Preliminary Acoustical Design Review
   Usually, it is beneficial to perform a preliminary review early in the design stage (at about 25% ready for construction), to ensure that provisions for unusual aspects are considered while there is still an opportunity to address them or to flag the issues for further analysis, ie stacking concerns, building orientation etc. As a result, alternative layouts or systems may be proposed for consideration. This will involve a review of the early architectural, mechanical, electrical drawings, as available. Many of our customers have come to recognize and value the benefits of our preliminary reviews and have now made them a standard part of their process in order to avoid costly changes and project delays that would otherwise have occurred later if not for our early input.
   Establishing Acoustical Criteria: Based on our discussions with project team members, we will identify acoustical criteria (Noise Criteria (NC) or Room Criteria (NC) Levels, Reverberation Time, Noise Isolation, Speech Intelligibility, Masking Sound Levels etc.), for the various noise sensitive spaces such as classrooms, auditoria, library spaces, meeting spaces, private offices, etc. We will consider the spatial separations and acoustic privacy expectations, space stacking and general building services or general occupancy concerns. The criteria targeted will be based on meetings with team members, any information or measurement gathered and will address spaces within the building as well as suggested limits for impact on adjacent uses. A criteria report will be prepared and circulated outlining the recommended criteria and comments on the schematic design, for discussion purposes.
   Façade and Glazing Specification: Once the drawings are sufficiently advanced, we provide refined glazing assembly requirements based on our previous environmental review and the latest floor layouts. This involves comparing the revised exposed glazing areas and associated room floor areas with those used in the environmental review and revising the glazing STC requirements, if appropriate, to meet indoor sound level criteria.
2. Detailed Acoustical Design Review
   Once the working drawings are approximately 60% to 75% ready for construction, a full building design review can be provided. Our scope of work for such a review includes a thorough review of architectural, mechanical, and electrical drawings and specifications to identify areas where better details or modified assemblies may be warranted. Structural dynamics, for example, are sometimes identified as a potential source of vibration problem for sensitive equipment. (An Engineering department’s Scanning Electron Microscope can be adversely affected by the vibration caused by equipment in a adjacent mechanical room or the activities of a nearby Gymnasium or Basketball Court.) We will conduct acoustical analysis and treatment of sensitive spaces such as lecture halls, gymnasiums, atria etc. Where necessary, we will present mitigation recommendations on preferred noise and vibration control measures. This may include providing silencer recommendations for fan systems, cooling towers, generator sets, etc., vibration isolation recommendations of major or sensitive equipment to limit structure-borne noise, etc.
   Mechanical and Electrical Systems: We will review the M&E drawings and the mechanical specifications to identify potential noise issues. Where improved details or upgraded noise control systems consistent with the goal for this building are warranted, comments or recommendations will be provided. Where a potential problem exists but more specific information about a particular mechanical or electrical system is required to perform a full assessment or to design mitigation, we will outline general requirements that can be added to the tender documents, placing onus for design on the supplier or installer.
   Retail and Commercial spaces: Note that any planned retail and commercial spaces are reviewed as shell spaces, as the specific uses of such tenant spaces can change with a change in tenancy. The onus is usually placed on tenants to ensure that their activities are compatible with the building’s permanent space usages and provisions or precautions are incorporated in their fit-outs. However, in instances where specific tenant usage is indicated in the base-building design, our experience allow us to make sufficient assumptions on the nature of the types of equipment and activity which could be expected and offer mitigation suggestions accordingly (e.g., Coffee Shop, Healthcare suite, Fitness Club, Spa, etc.).
   
3. Follow-up Review
   Once the design team has indicted that they have integrated our recommendations into the construction documents (95-100% CD), a follow-up review can be conducted to confirm that our recommendations have been incorporated. Additional follow-up reviews required to address specific omissions or design changes may be required

During Construction

There are several aspects of the project during construction where we are also able to offer additional assistance for the design/build team.

Construction Vibration Assessment: Toronto is one of the few cities in North America with a City By-Law, 514-2008, that requires that a Construction Vibration Assessment be conducted in support of an application for a building or foundation permit. It mandates that a Professional Engineer assess the potential for impact on off-site structures in a “zone of influence” by the vibration effects of shoring, excavation and demolition activities. HGC Engineering is fully versed in all aspects of Construction Vibration Monitoring and Assessment. We offer the in-house know-how and monitoring technology your require to efficiently and cost-effectively meet your assessment and timeline requirements. Visit our Construction Vibration Monitoring and Assessment page for more details. 

Shop Drawing Reviews: Shop drawings can be reviewed once the project enters the construction phase. We will review typical base-building equipment drawings for consistency with the specifications and recommendations contained in our initial review.

Site Inspections: Site inspections or field testing is often driven by the sensitivity of a specific issue, the complexity of its implementation or by the regulatory requirements as is the case in residential projects in Ontario (ie Tarion Bulletin 19). Comprehensive inspections focus on the correct implementation of he architectural details and mechanical noise and vibration controls and often include site discussions with the trades to ensure proper implementation. Testing may include verification of acoustic separations.

Post Construction

Commissioning: During commissioning we will conduct measurements of reverberation and background sound to confirm compliance with the criteria.

Noise and Vibration Complaints: We offer on-going noise and vibration complaint forensics and troubleshooting to building managers of both new and mature buildings.

Tenant Fit-Out: We can work directly with new post-construction tenants and their chosen interior design and build teams to address any acoustical related requirements within their space, including acoustical privacy and sound masking requirements.