For most interior tenant improvements in Metro Vancouver, batt insulation (fibreglass or mineral wool) is the simpler, faster choice because it installs in occupied buildings without cure time. Spray foam earns its place where you need air sealing, moisture control or continuity in the building envelope, such as warehouse walls, roof decks and exterior assemblies.

This guide is written for property managers, landlords, strata councils and operators who have to scope, permit and schedule the work. It covers how each system performs, what the BC Building Code expects, how installation affects an occupied building, and how to write the scope so the price you receive is comparable.

Multigroup
Plan Commercial Insulation Work With Care
Multigroup coordinates permits, code compliance and trade sequencing for commercial fit-outs across Metro Vancouver and the Lower Mainland.
Visit Multigroup

TL;DR

  • Batts suit framed interior walls, demising walls and ceilings: no cure time, other trades can keep working, and mineral wool adds fire and sound performance.
  • Spray foam suits envelope work where air, vapour and water control matter, but foam on interior surfaces must be covered with a fire-resistant material.
  • Spray foam installation usually means the space is vacated during application and for the product’s re-entry period. Plan the schedule around that.
  • Cost depends on thickness, area, access, labour and region. Ask every bidder for the same R-value target, assembly and fire-protection scope.
  • Your general contractor should coordinate the insulation trade, permit and inspection sequence so nothing gets covered before it is approved.

Table of Contents

How the two systems perform differently

Spray foam is applied on site and expands in place, so it fills irregular gaps and seals air leaks as it goes. Batts are pre-cut blankets that perform well only when they fill the cavity completely. The better choice depends on the assembly you are insulating, not on one product being universally superior.

Natural Resources Canada describes spray foam as a site-applied material that expands in place, available in low-density and high-density types. The same guidance notes that batt or blanket insulation is relatively easy to install in accessible cavities, but it has to fill the space without gaps or compression to reach its intended performance. In a clean, open stud wall, that is easy to achieve. Around pipes, ducts, electrical boxes and irregular steel, it takes care.

The Building Science Corporation’s commercial guide says high-density closed-cell spray foam can provide continuity of the water, air, vapour and thermal control layers in a building enclosure. That is a genuine advantage for a building envelope with complex junctions, such as a warehouse where wall meets roof deck.

The Insulation Institute makes a point worth keeping in mind when comparing bids: nominal R-value is not the whole story. Air sealing, installation quality, moisture exposure, UV exposure and long-term dimensional stability all affect how a system performs once it is in the wall.

Quick comparison for commercial scopes

Factor Spray foam Fibreglass or mineral wool batts
Typical location Envelope: exterior walls, roof decks, slab edges Framed interior walls, demising walls, ceilings
Air sealing Built in as it expands Needs separate air barrier and sealing details
Installer Specialty contractor Trade crew, often in-house or by the GC
Cure or re-entry time Yes, product-specific None
Occupants and other trades Usually out during application Can generally stay and keep working
Interior fire protection Must be covered with a fire-resistant material Mineral wool is noncombustible; the finished wall still follows code

Fire protection and BC Building Code considerations

Spray foam on interior surfaces generally has to be covered with a fire-resistant material. Mineral wool is noncombustible and often chosen for fire-rated and acoustic assemblies. In either case, the assembly, not the insulation alone, has to meet the BC Building Code, and your permit drawings should show it.

Natural Resources Canada states that foam installed on interior surfaces must be covered with a fire-resistant material, typically 13 mm drywall that is mechanically fastened to the building. The British Columbia Building Code Appeal Board has explained that foamed-plastic insulation in a noncombustible building may require separation from adjacent spaces by a thermal barrier such as 12.7 mm gypsum board, and that fire-resistance-rated assemblies must meet the applicable tested or assigned rating route.

For a tenant, that means the cost of spray foam on an interior wall includes the covering. For a landlord, it means exposed foam left in a mechanical room or above a ceiling is a deficiency waiting to be flagged at inspection.

Mineral wool sits at the other end of the fire scale. The City of Calgary states that mineral wool is the most fire-resistant of the insulation types it compares. Johns Manville Canada reports that its commercial mineral-wool products have a melting point above 1,093°C and flame-spread and smoke-developed indices of 0. That is one reason mineral wool is a common specification in demising walls between tenants. Our guide to commercial demising wall inspections in BC shows where those inspections fall in the sequence.

For wider code context, see our BC Building Code contractor compliance guide.

Fire protection and BC Building Code considerations

Moisture, durability and sound

Spray foam has the edge on water resistance and air tightness. Mineral wool and fibreglass have the edge on drying behaviour, stability and, for mineral wool, sound control. Which matters more depends on where the assembly sits and what it separates.

The City of Calgary says spray foam is the most water-resistant of the types compared, and that mineral wool regains its insulation value after drying. The same page warns that fibreglass batt or cellulose can clump or slump over time, permanently reducing insulation value unless replaced. That risk is mainly a quality-of-installation issue in tall cavities, so batt walls should be properly fitted and supported.

Moisture and durability comparison of insulation types

The Insulation Institute adds that fibreglass and mineral-wool batts do not settle, absorb less than 1% of their weight in moisture, need no drying or curing time, and are available in inorganic unfaced products that do not feed mould. Spray foam, it notes, is susceptible to ultraviolet exposure if left uncovered, which matters for any foam at a roof edge or open wall panel.

On sound, Johns Manville Canada says its mineral-wool products can improve wall-assembly STC ratings by up to 10 dB. For medical clinics, offices with meeting rooms and mixed-use buildings, acoustic privacy between suites often drives the wall specification more than energy does. We cover the batt options in more depth in mineral wool vs fibreglass in commercial fit-outs.

When spray foam makes sense in Metro Vancouver projects

Spray foam makes sense where the insulation also has to be the air barrier, or where the geometry makes batts impractical. In our experience that means envelope-focused work: warehouse and industrial renovations, roof decks, irregular cavities and exterior walls where continuity of the control layers matters.

Typical cases include:

  • Warehouse and industrial upgrades. Older tilt-up or steel buildings often have thin or failing insulation and many leakage points at wall-to-roof junctions. Foam seals and insulates in a single pass. See our warehouse renovation services.
  • Cold-storage or temperature-controlled zones. Continuous air and vapour control helps keep conditioned space stable.
  • Irregular or hard-to-reach cavities. Where framing, services and structure make a clean batt fit unrealistic.
  • Envelope upgrades tied to energy goals. For the wider picture, see our energy efficiency in construction guide.

In every case, the foam type, thickness and covering should be written into the scope. Vague wording such as “insulate walls” is how two bids end up 40% apart for reasons nobody can explain.

When batts are the better fit

Batts are the practical choice for most interior tenant improvements: new partition walls, demising walls, ceilings and acoustic separations. They install quickly, require no cure period, and let other trades continue working nearby, which protects the schedule in occupied buildings.

NAIMA Canada notes that fibreglass and rock or slag wool require no drying or curing time, and that occupants and other trades do not need to leave during installation. That single fact reshapes the schedule of a tenant improvement in a building with neighbours. Typical batt uses include:

  • Office suites with new meeting rooms, where sound control is part of the lease requirements.
  • Medical and clinic fit-outs with privacy requirements between treatment rooms.
  • Retail and restaurant demising walls that separate your space from the neighbour.
  • Strata common-area upgrades where residents remain in the building throughout.

The installation standard still counts. Batts must fill the cavity completely without gaps or compression, so we check fit around electrical boxes, pipes and bracing before the walls are closed up.

Installing in an occupied building

Batt installation can run alongside other work, while spray foam needs a controlled window: the space is vacated during application and for the product’s re-entry period. For occupied buildings, that window has to be coordinated with the property manager, neighbouring tenants and ventilation systems.

NAIMA Canada advises that occupants should be absent during spray foam installation and for the product-recommended period afterward, and that curing and re-occupancy depend on the product and the installation conditions. It also says spray foam is normally installed by a specialty contractor, and that trimming excess expansion before full cure can expose workers to unreacted chemicals.

An indoor-air investigation firm recommends turning off, closing and covering mechanical systems during application, protecting exposed surfaces, and removing remaining dust or overspray, preferably by HEPA vacuuming. It also notes that incorrectly mixed or applied foam can produce odours that persist. These are the reasons we plan foam work as its own phase:

  1. Notify the building. Give property management and adjacent tenants the dates and the re-entry period in writing.
  2. Isolate air handling. Shut down and cover intakes and return paths in the work zone and neighbouring areas as the product guidance requires.
  3. Schedule after hours or in a closed zone. Evenings, weekends or a sealed-off area keep the building operating.
  4. Hold the re-entry period. Do not shorten it to recover time lost elsewhere.
  5. Clean and inspect. Remove overspray and dust, then book the inspection before the covering goes on.

The same discipline applies under WorkSafeBC. As prime contractor on a project, we coordinate the trades so the foam crew’s work area is controlled and other workers are not exposed.

What drives the cost in CAD

Insulation cost depends on the assembly, not just the product. Spray foam is typically priced by thickness and area and carries specialty labour, while batts are priced by area and installed by a general trade. For a fair comparison, price the whole wall or roof assembly, including covering, access and schedule impact.

Published Canadian commercial sources point to the same set of cost drivers: foam type, thickness, area, accessibility, labour complexity and region. Per-square-foot figures online vary widely, and they usually exclude covering, disposal, access equipment and after-hours premiums, so we do not recommend budgeting from a headline number. Ask each bidder to price:

  • The target R-value or the required effective thermal resistance for the assembly.
  • The foam type and thickness, or the batt type and thickness.
  • The fire-resistant covering or thermal barrier required by code.
  • Access equipment, protection of finishes and cleanup.
  • After-hours or phased work, and any re-entry period.
  • Permit, inspection and engineering costs if the assembly is changing.

That list also helps a landlord approve a tenant’s insulation scope without reopening it later. Our commercial renovation team writes these items into a fixed scope so the contract price reflects the assembly rather than a material allowance.

Scope, permits and sequencing

Insulation touches the permit, the inspection sequence and the schedule. The BC Building Code, and any City of Vancouver or municipal requirements, determine what has to be approved before walls are closed. Your contractor should confirm these early so nothing is covered before inspection.

A practical sequence for an interior fit-out looks like this:

  1. Confirm the assembly on the permit drawings, including fire ratings and acoustic targets.
  2. Complete framing, rough-in electrical, plumbing and mechanical.
  3. Pass the required framing and rough-in inspections.
  4. Install insulation, with foam as a separate controlled phase when it is used.
  5. Complete any required insulation or envelope inspection.
  6. Close up with drywall or the required fire-resistant covering.

Demising walls and rated assemblies carry the most inspection risk, which is why we covered them separately in our piece on commercial demising wall inspections. If mechanical changes are in the scope too, the heating and ventilation decisions can affect the schedule as well: see radiant floor vs forced air in Vancouver TIs.

One more point for landlords: the rules change. Check current requirements with the authority having jurisdiction, and use the BC Building Code compliance guide as a starting checklist rather than a substitute for the permit review.

Our perspective

Most insulation decisions we see go wrong at the scoping stage, not in the wall. Someone writes “insulate” on a drawing, bids come in with different assumptions, and the cheapest one wins until the inspection or the neighbour’s complaint.

Our approach is to match the system to the assembly. Interior partitions and demising walls usually call for batts, with mineral wool where fire and sound targets are tight, because the trades can keep working and the building stays open. Envelope work in warehouses and industrial buildings is where foam can be worth the extra planning, provided the covering, re-entry period and inspections are in the schedule from day one.

We are a hands-on commercial general contractor, and we manage the permits, the BC Building Code review, WorkSafeBC prime contractor duties and phased or after-hours work in occupied buildings. That means one accountable contractor decides the sequence, rather than three trades guessing at it.

MultigroupTeam

Plan your insulation scope with Multigroup

If you are scoping a tenant improvement, a warehouse renovation or a strata common-area upgrade in Metro Vancouver, we can help you settle the insulation approach before the tender goes out. We handle permits, scheduling and coordination in occupied buildings, with fixed scope and clear schedules.

Multigroup

Tell us the building, the assembly and your timeline through our contact page, or explore our commercial construction services first. For restaurant and café projects, our coffee shop and restaurant renovation page covers how we run those fit-outs.

FAQ

Is spray foam or batt insulation better for a commercial tenant improvement?

For most interior tenant improvements, batts are the better fit. They install without cure time, other trades can keep working, and mineral wool adds fire and sound performance for demising walls. Spray foam is better reserved for envelope work where air and moisture control are the priority.

Does spray foam have to be covered in a commercial building?

Yes, in general. Natural Resources Canada says foam on interior surfaces must be covered with a fire-resistant material, typically 13 mm drywall. The BC Building Code Appeal Board also describes thermal barrier separation for foamed plastic in noncombustible buildings. Confirm the exact requirement for your assembly with the permit review.

Can tenants stay in the building during spray foam installation?

Guidance from NAIMA Canada says occupants should be absent during spray foam installation and for the product-recommended period afterward. Batts do not carry that restriction. If foam is in your scope, plan for after-hours or zoned work and written notice to neighbouring tenants.

Why would existing spray foam need to be removed?

The usual reasons are installation problems, such as incorrect mixing that causes lingering odours, or foam that was left uncovered where code requires protection. Removal and replacement scopes should be assessed by a qualified contractor and an indoor-air professional case by case.

Sources