Industries
Residential and mixed-use acoustics
A residential project can clear every approval, satisfy the Code, and still hand over a building that generates complaints in the first month. That is what happens when acoustics is not dealt with properly, and nothing about it announces itself until people move in.
Our experience
The engineers at Bentham have worked as acoustical consultants across the full range of residential development in Canada: low-rise and stacked townhouses, purpose-built rental, high-rise and mixed-use towers, master-planned communities, and infill on constrained urban sites.
That covers noise feasibility studies for planning approval, the partition, floor and mechanical design that determines whether the building performs, and the design certification and field testing Tarion requires at the end. Most of our work is one piece of it. Having done all three, on the same buildings, is what makes the early decisions visible while they are still cheap to change.
At the larger end, that has included supertall and complex mixed-use towers where the structure itself creates the acoustic problem. Deep transfer beams and mega columns run between suites, and mechanical levels holding generators, chillers and cooling towers sit partway up the building with residences above and below them. Hotel and retail in the same stack add another set of neighbours. These are buildings where the acoustic strategy has to be settled alongside the structure rather than after it.
We also get called in after occupancy, on complaints between a podium tenant and the residents above, or between suites. That work informs the design side more than anything else does, because it shows which details hold up once people are living in the building.
Bentham Acoustics is new. Its engineers are not. The projects described here were carried out by Bentham engineers over their careers, at this firm and before it.
A full list of relevant project experience is available on request.
What comes up most
The study lands before the design does.
A noise feasibility study is usually required while unit layouts, glazing and the mechanical concept are still provisional. Whatever it assumes becomes a condition of approval, and the project buys that assumption for good. Warning clauses and mandatory air conditioning both originate here, and both reach the sales office. Done early, with the design team in the room and the massing still movable, the same study routinely gives scope back in glazing and mechanical.
Neighbour to neighbour is what gets complained about.
Suite-to-suite sound, footfall from above, the corridor door. These are governed by details rather than ratings: how the partition meets the deck and the façade, what happens at the electrical boxes, how the floor assembly is actually built. An assembly that performs in a laboratory can fall short in place, and the difference is almost always the junctions.
Amenity under bedrooms.
Gyms are the current problem. Dropped weights put impact energy straight into the structure, and it carries further than most people expect. Getting the structure right is the cheapest lever, but it is not the only one: resilient floor systems, isolated platforms and drop zones all work, and they can be retrofitted when a complaint has already arrived. Same conversation for pools, party rooms and rooftop terraces.
Mixed-use ground floors.
A restaurant or grocery at grade brings loading, refrigeration and kitchen exhaust into a building full of people trying to sleep, usually before the tenant is known. The base building has to carry assumptions about a use nobody has signed yet.
Rail, transit and road corridors.
Proximity brings vibration and ground-borne noise into scope alongside airborne sound, and the corridor owner’s adjacent development requirements sit on top of the provincial guideline. Those can reach the structure, which makes them expensive to discover late.
Class 4 noise areas and sites near existing industry
Infill is increasingly proposed on land next to facilities that were there first. NPC-300 provides for a Class 4 area classification, applied by the land use planning authority to the proposed development, which permits higher sound level limits in exchange for mitigation, warning clauses and acknowledgement on title.
It is a useful mechanism and it is not a formality. It needs the municipality’s agreement, it usually attracts a peer review, and the obligations persist after occupancy. It also changes the position of the neighbouring facility, which has its own interest in the outcome. Whether to pursue it is a planning, legal and commercial decision as much as a technical one, and it is best made early with a clear view of what the alternative costs.
Tarion RB19 acoustic review and testing
For Type C and Type D condominium projects, Tarion’s Registrar Bulletin 19, still known to most people as Builder Bulletin 19, treats acoustics as its own risk area. It covers sound transmission between suites and between suites and interior common areas, including elevator shafts, service shafts and amenity spaces, and it runs from design review through to field testing of the completed building.
Depending on the project, the acoustical consultant can review design documents, certify construction drawings, review shop drawings, attend mock-ups and carry out the field testing, reporting through the project’s Field Review Consultant. The scope is worth settling early, because the requirements are built around the finished suite rather than the drawing set, and the work has to run alongside construction to answer them.
Standards and requirements in Ontario
The Ontario Building Code sets sound isolation between dwelling units as an apparent sound transmission class, measured in the finished building rather than derived from the assembly, since January 1, 2020. MECP publication NPC-300 governs sound arriving from outside, setting indoor criteria for living and sleeping spaces, an outdoor criterion for amenity areas, and the area classifications. Tarion’s Construction Performance Guidelines set out what is treated as a warranted defect after closing. Municipal site plan and draft plan conditions sit on top of all of it, and warning clause wording is frequently prescribed locally.