Footsteps from above
Impact noise through a floor assembly. Insulation in the joist bay helps with the airborne portion; the impact portion is largely about the floor surface and how the ceiling is hung.
Service
Soundproofing Company in Mississauga
Acoustic treatment for walls, ceilings and mechanical rooms in homes, offices and multi-unit buildings — planned around how sound is actually travelling.
- What insulation does
- Absorbs sound inside a cavity
- What it does not do
- Break the structural paths sound travels along
- Depends on
- The type of noise and how the assembly is built
- Cost driver
- Area, assembly type, access and the level of change
Soundproofing reduces how much noise passes between spaces. Insulation contributes by absorbing sound energy inside a cavity, but real improvement comes from treating the assembly as a whole — mass, structural separation and sealing together. NorthStar assesses where sound is actually getting through before proposing work.
Absorption vs. isolation
These two things get sold under the same word and they are not the same job. Getting them mixed up is the single most common reason a soundproofing project disappoints.
| Sound absorption | Sound isolation | |
|---|---|---|
| The problem it solves | Echo and reverberation inside a room | Noise passing between two spaces |
| Typical complaint | “This room is echoey, I can’t hear on calls” | “I can hear the neighbours / the TV / the plant room” |
| How it is achieved | Soft, porous surfaces within the room | Mass, separation and sealing in the assembly |
| Where the work happens | Room surfaces | Inside the wall, floor or ceiling |
If your complaint is that you can hear something from somewhere else, you need isolation. Adding absorbent panels to the room will change how the room sounds, but it will do very little about the neighbour.
How sound gets through
Sound reaches the other side of a wall by several routes at once:
- Through the assembly. Airborne sound vibrates one face of the wall, which passes vibration through the structure to the other face, which radiates sound into the next room.
- Through gaps. Sound travels through air. A small unsealed gap around a penetration, at the perimeter or under a door can undo a great deal of careful work in the assembly.
- Through flanking paths. Around the wall rather than through it: via the floor, the ceiling plenum, continuous framing, shared ductwork or a back-to-back electrical box.
- Through structure. Impact noise — footsteps, dropped objects, vibrating equipment — enters the structure directly and travels a long way through it.
Impact noise and airborne noise are different problems with different solutions. Footsteps from the unit above are structure-borne and are usually addressed at the floor, not by adding insulation to your ceiling.
Insulation’s role in sound control
Insulation in a cavity absorbs sound energy that would otherwise bounce around inside it and drive the far face of the assembly. It is a real and worthwhile contribution — a filled cavity performs better than an empty one — and it is the part of the job we do.
But it is one contributor among several. Adding insulation to a wall whose two faces are rigidly connected through continuous framing, or whose perimeter is unsealed, produces far less improvement than the material data sheet would suggest. The insulation is not underperforming; the rest of the assembly is dominating the result.
Both fibreglass batt insulation and spray foam can play a part in acoustic assemblies. They behave differently: a soft, porous, fibrous batt is generally the better cavity absorber, while foam’s strength is sealing air paths. Which matters more depends on whether the dominant problem is cavity resonance or leakage.
Why it has to be a system
Sound isolation comes from three things working together:
- Mass. Heavier assemblies are harder for sound to vibrate.
- Separation. Reducing the rigid connections between the two faces of an assembly, so vibration cannot pass directly across.
- Sealing. Closing the air paths — perimeters, penetrations, service boxes, door undercuts.
Insulation supports all three but delivers none of them on its own. That is why we treat a soundproofing enquiry as an assessment first: which of these three is the weak link in your building, and what can realistically be changed.
What we will tell you at the assessment
We will identify where sound is most likely getting through, explain which of mass, separation and sealing is the limiting factor, and set out what a realistic improvement looks like for your building — including where the honest answer is that the achievable improvement is small relative to the cost.
Homes
Common residential requests:
- Bedrooms next to living areas or bathrooms
- Home offices where calls need to stay private
- Media rooms and music rooms
- Basement suites and secondary units
- Floors between storeys where footfall carries
- Party walls in semi-detached houses and townhouses
Party walls are worth a specific note. In an existing semi or townhouse, the wall was built the way it was built, and the framing arrangement between the two houses is fixed. What can be achieved from one side only is real but bounded, and we would rather set that expectation before the work than after.
Offices
- Meeting rooms and boardrooms where confidentiality matters
- Private offices along open-plan floors
- Medical, dental and professional consulting rooms
- Demising walls between separate tenancies
- Walls that stop at the ceiling grid rather than continuing to the deck
That last point catches a lot of fit-outs. A partition that stops at a suspended ceiling leaves the plenum above it wide open, and sound simply travels over the top. Taking the wall to the underside of the structure changes the result far more than anything you can add to the wall itself.
Related: commercial insulation.
Multi-unit buildings
- Demising walls between units
- Floor and ceiling assemblies between storeys
- Corridor walls and entry doors
- Walls adjacent to elevators, refuse chutes and service risers
- Units next to amenity spaces, gyms and party rooms
In multi-unit work, flanking is usually the dominant issue. Continuous floor slabs, shared ductwork and service risers give sound routes that go around the demising wall entirely, which is why treating that one wall sometimes changes less than expected. We will say so if that is what we find.
Mechanical rooms
Plant rooms, pump rooms, elevator machine rooms and rooftop equipment enclosures produce continuous low-frequency noise and vibration — the hardest kind to control. Low frequencies pass through assemblies that handle speech comfortably, and vibration transmitted into the structure can appear in rooms nowhere near the equipment.
Meaningful improvement here often involves the equipment mounting as much as the room construction. We treat the enclosure; if the dominant path is structure-borne vibration from the equipment itself, we will tell you that the fix belongs with the mechanical contractor rather than with us.
Honest limitations
What soundproofing cannot do
- Nothing eliminates sound completely. The goal is meaningful reduction, not silence.
- Low frequencies are hard. Bass, machinery hum and traffic rumble pass through assemblies that handle speech well.
- Impact noise is a different problem. Footsteps usually need treatment at the floor above, which may not be yours to change.
- One weak element sets the result. An untreated door, an unsealed penetration or a flanking path caps what the rest of the work can achieve.
- Treating one side has limits. Where you can only work from your own side of a shared assembly, the achievable improvement is bounded.
- Existing construction constrains the options. What can be done in a finished building is narrower than what can be designed into a new one.
How we approach a project
- Understand the complaint. What you are hearing, from where, when, and how disruptive it is. “Voices from next door in the evening” and “the furnace at 6am” lead in different directions.
- Assess the assembly. What the wall, floor or ceiling is made of, and how the spaces connect.
- Identify the likely paths. Direct transmission, gaps, flanking, or structure-borne.
- Propose a scope. What can be changed, what it should improve, and what it will not address.
- Install. Including the sealing details, which are the part most often skipped and most often decisive.
- Review with you. Walk the completed work and confirm what was done.
What affects the cost
- Area treated
- How much of the assembly changes — adding insulation to an open cavity is a very different scope from rebuilding a wall
- Access — open framing during construction versus a finished, occupied room
- Making good — drywall, taping, painting and trim reinstatement
- Doors and penetrations — frequently the limiting element, and frequently the most cost-effective thing to fix
- Flanking paths — treating them can significantly expand the scope
- Occupied building constraints — phasing, dust control, out-of-hours work
Frequently asked questions
Will insulation alone soundproof my wall?
It will reduce sound transmission, often noticeably, but it will not soundproof the wall. Insulation absorbs sound energy inside the cavity, which is one part of the problem. How much sound gets through also depends on the mass of the layers, whether the two faces of the wall are structurally connected, and how well the edges and penetrations are sealed.
What is the difference between absorption and isolation?
Absorption is about sound within a room — reducing echo and reverberation so the space sounds better. Isolation is about sound between spaces — stopping noise passing from one room to another. Products that do one do not necessarily do the other, and confusing the two is the most common reason people are disappointed with the result.
Can you soundproof a room without opening the walls?
Options are much more limited with the walls closed. Meaningful improvement in sound isolation usually involves changing the assembly, which means access. Sealing gaps, addressing doors and treating flanking paths can help without opening walls, and sometimes that is enough — it depends on how much reduction you need and where the sound is actually coming from.
Why is my neighbour’s noise louder in some rooms than others?
Sound often takes an indirect route — through floors, ceilings, shared framing, ductwork or service penetrations — rather than straight through the wall you are facing. These flanking paths mean the loudest room is not always the one closest to the source. Finding the real path is the first job on any soundproofing project.
Do you guarantee a specific noise reduction?
No. Achieved performance depends on the whole assembly, the construction around it, the flanking paths present and the nature of the noise, so a number promised in advance without a full assessment would not be trustworthy. We will explain what a proposed approach is intended to improve and what it will not.
Is soundproofing worth doing in a rental or commercial fit-out?
Often yes, particularly for meeting rooms, medical or professional offices where confidentiality matters, and demising walls between tenancies. The time to do it is while the walls are open during fit-out — retrofitting later costs considerably more for the same result.
Applications
The complaints we are usually called about
Sound problems are described by symptom and solved by path. What is actually carrying the noise decides whether insulation helps a lot, a little, or not at all.
Voices through a party wall
Airborne sound between units or rooms. Absorption within the cavity is a genuine part of the answer here, alongside how the wall is built and sealed.
Home offices and bedrooms
Interior partitions where a noticeable improvement is wanted rather than silence. Often the most cost-effective sound work in a house.
Basement apartments
Separation between a secondary suite and the house above, where both airborne and impact noise are usually in play at once.
Mechanical rooms
Equipment noise reaching corridors and adjacent spaces, where vibration through the structure often matters more than sound through the air.
Offices and boardrooms
Speech privacy between rooms, including the ceiling void above a partition, which is a bypass route people routinely forget about.
Suitability
Where soundproofing does and does not belong
Every material on this site is the wrong answer somewhere. Knowing which side of this split your project sits on is worth more than any specification sheet.
A good fit when
- Airborne noise — voices, music, television — through a cavity wall or floor
- Assemblies open during construction or renovation, where the cavity is reachable
- Projects wanting a clear, noticeable improvement rather than silence
- Rooms where the ceiling void or a shared duct is an obvious bypass
Probably the wrong choice when
- Expectations of a completely soundproof room — no insulation delivers that
- Impact and vibration problems where the structural path is the real issue
- Finished assemblies where nothing can be opened up and nothing can be added
- Cases where a gap, a door undercut or a duct is carrying most of the sound
If your project sits on the right-hand list, say so when you call and we will point you at the service that actually fits — including the cheaper one. Here is how this work relates to everything else we do.
Sound work overlaps with the rest of what we install more than most people expect. The material inside a partition is often ordinary fibreglass batt, and in a deep or irregular cavity open-cell foam absorbs well while filling the space completely. Neither becomes soundproofing on its own — what decides the outcome is how the assembly is built and sealed around them.
That is also why we will not quote a decibel figure from a description. A floor carrying footsteps, a party wall carrying voices and a plant room carrying vibration are three different problems, and only one of them is mostly solved by what goes in the cavity.
Acoustic work comes up across every audience we serve: home offices and basement suites for homeowners, speech privacy and mechanical noise in offices and multi-unit buildings, plant separation in industrial facilities, and party-wall detailing specified by builders. The semis and row housing across Etobicoke produce a steady stream of it. Describe what you can hear and where you are standing, and we will tell you honestly what insulation can and cannot do about it.
Before you commit
Honest limits worth knowing first
This is the service where expectations most often outrun what the work can deliver, so it is worth being direct about the boundaries before anyone spends money.
Insulation alone is not soundproofing
Filling a cavity absorbs sound inside it. If the two sides of the assembly are still rigidly connected, sound travels around the cavity through the structure regardless of what is in it.
Small gaps carry a lot
An unsealed electrical box, a gap at the top plate or an undercut door can undo most of an assembly. Sealing is not the finishing touch here; it is a large part of the result.
Impact noise is a different problem
Footsteps and dropped objects put energy directly into the structure. That is addressed at the floor surface and the ceiling connection, not by adding material to the cavity.
Flanking paths
Sound routes over a partition through the ceiling void, along a continuous floor, or through a shared duct. Treating the wall while the bypass stays open produces a disappointing result.
Also from NorthStar
Other services that come up alongside this one
Spray Foam Insulation
Open-cell and closed-cell polyurethane foam that insulates and air seals in a single application. Used in attics, walls, basements, crawl spaces and commercial envelopes.
Blown-In Attic Insulation
Loose-fill fibreglass or cellulose blown across an attic floor to an even, measured depth. The usual choice for topping up an under-insulated attic.
Attic Insulation Removal
Vacuum removal of old, damaged or contaminated attic insulation, with containment and disposal, so the attic can be air sealed and re-insulated properly.
Related services
Book a soundproofing assessment
Tell us what you are hearing and where. We will look at the assembly, work out how the sound is getting through, and tell you honestly what can be improved.