Building envelope experts
Exterior insulation installation in Montreal and on the South Shore
Hydro bills climbing? Your home is cold despite the heating? We identify thermal bridges and install the insulation that makes a difference from the first winter, Isoclad, rock wool or cellulose, turnkey.
Our partners
Cladding specialist
What is high-performance insulation?
Cold home in winter or overheated in summer? A free thermal diagnosis reveals the heat-loss areas. We install the insulation suited to your building, Isoclad panels, rock wool or cellulose, and several solutions qualify for Hydro-Québec’s Rénoclimat program. Turnkey service, no hassle.
Thermal comfort
Elimination of cold spots, drafts and heat loss for a uniform, comfortable interior.
Energy savings
A significant drop in your Hydro-Québec bills from the very first winter thanks to better heat retention.
Acoustic insulation
Less outside noise for a calmer, more pleasant indoor environment.
Property value
A well-insulated home sells better and faster. A profitable long-term investment.
Our expertise
Residential and commercial insulation
Every building has its own structure and every insulation has its strengths. We help you choose the right insulation based on your budget, your building type and thermal requirements.
Years of experience
Completed projects
Client satisfaction
sq. ft. installed
How it works
The steps to get your cladding replaced
Thermal inspection
Assessment of thermal bridges, drafts and heat-loss areas.
Insulation selection
Selection of the suitable product (Isoclad, rock wool, cellulose) based on your building and your goals.
Site preparation
Surface protection, installation of vapor barriers and wall preparation.
Insulation installation
Installation of the insulation to Building Code standards and the manufacturer’s recommendations.
Final inspection
Verification of thermal continuity and full site cleanup.
They trust us
“Nous avons fait appel à EJA pour le revêtement extérieur (acier MAC) de notre agrandissement. Nous avons été en contact avec Emir pour la planification du projet et avec Jérémy et leur équipe pour l'exécution. Nous sommes très satisfaits de la qualité et de la rapidité d'exécution du travail effectué. Les commentaires Google, sur lesquels nous nous sommes fiés, sont bien fidèles à la réalité. Je recommande donc grandement les services de l'entreprise EJA pour vos projets de revêtement extérieur.”
“Mon premier contact avec l'équipe a été avec Emir. Il est venu rapidement, retournait ses appels. Il m'a bien accompagné pour la soumission, le permis et s'est montré patient avec le financement. Ensuite, Jérémie et son équipe ont fait la pose. Ils sont respectueux, vérifient les morceaux avant de les installer et ont corrigé des défauts sur la maison pour empêcher l'eau de s'infiltrer. À la fin de chaque journée, Jérémie faisait le tour avec nous et le chantier restait propre. On n'a pas eu de surprise, la communication était bonne et les délais respectés. Je recommande !”
“J'ai fait appel à EJA pour le revêtement extérieur de ma maison, qui était vraiment en mauvais état. Je suis absolument ravi du résultat : l'équipe a travaillé avec un grand souci du détail, et le changement est spectaculaire. Ma maison a retrouvé toute sa beauté, presque comme neuve. Je recommande vivement leurs services à quiconque veut redonner vie à l'extérieur de leur maison.”
“Très bonne expérience avec Jérémie et son équipe ! On a fait refaire une terrasse en hauteur, qui sert aussi de toit, et permet l'écoulement des eaux. L'équipe a bien travaillé dans des conditions météo difficiles et en hauteur. Le résultat est bien fait. Les communications étaient bonnes.”
“Excellent service. On a fait appel à EJA pour des travaux de calfeutrage pour notre copropriété. Très pro, bonne communication avant, pendant et après les travaux. 5/5”
“Les Entreprises EJA did an excellent job on the complete overhaul of the wooden siding of our chalet, and stand highly recommended for their reliability and conscientious work! Emir, Jeremie and their team reassured me that there are still hardworking young people out there, for whom a job well-done is not only a question of money well-earned, but also of professional pride and honor!”
Reviews published on Google
See all 78 reviews on GoogleStep 1 — Thermal diagnosis
What we assess during the diagnosis
Before any installation, our expert evaluates the complete thermal envelope to target the most effective solutions.
Thermal bridges
Spotting the contact areas between inside and outside that create heat loss
Air infiltration
Detecting drafts through joints, windows, soffits and other openings
Moisture and condensation
Identifying areas at risk of condensation and mold inside the walls
Existing insulation thickness
Measuring the current insulation and assessing possible improvements
Vapor barrier condition
Checking the integrity of the existing vapor barrier
Envelope ventilation
Analyzing ventilation to prevent moisture buildup in the wall cavities
Step 2 — Regulations and permits
We handle everything. You have nothing to do.
Many municipalities require a permit before replacing exterior cladding. At EJA, it is included in our service: we check local requirements, prepare the documents and manage the process for you.
Checking municipal requirements
Every city has its own rules. We review your municipality’s bylaws before submitting anything.
Permit application if required
We prepare the documents, the plans and the complete file. We submit on your behalf and follow up.
Building Code compliance
All our work meets the requirements of the Quebec Building Code and current RBQ standards.
Service areas
We travel
everywhere for you
Montreal
- Verdun
- Lachine
- Plateau Mont-Royal
- Saint-Laurent
- Westmount
- Ahuntsic
- Anjou
- Griffintown
South Shore
- Longueuil
- Brossard
- Châteauguay
- Boucherville
- Saint-Jean-sur-Richelieu
- Sainte-Hyacinthe
- Saint-Bruno
North Shore & Laval
- Laval
- Blainville
- Boisbriand
- Mirabel
- Rosemère
- Terrebonne
- Mascouche
Don't see your area? Contact us to discuss your project.
Step 3 — Choosing the materials
Our insulation solutions
We work with the best insulating solutions on the market to suit your project.
Rock wool (Isoclad)
Exceptional thermal and acoustic protection, naturally non-combustible and moisture resistant.
Strengths
- Exceptional thermal resistance
- Acoustic protection
- Naturally non-combustible
- Moisture resistant
Cellulose
An eco-friendly, high-performance solution that fills every nook to eliminate leaks.
Strengths
- Eco-friendly material
- Fills small spaces
- Excellent value for money
- Eliminates air leaks
Isoclad panels
The insulating panel of choice that acts as a thermal barrier, eliminating heat loss through the structure.
Strengths
- Continuous thermal barrier
- Eliminates thermal bridges
- Fast installation
- Long-term performance
Fiberglass
A proven, affordable and effective solution for insulating walls, ceilings and attics.
Strengths
- Affordable solution
- Easy installation
- Proven performance
- Suited to every space
Step 4 — Detailed quote
A clear quote, no surprises
Your quote includes materials, labor, timeline and warranties. Here are the 4 factors that make a project’s cost vary.
Insulation type
Rock wool, cellulose, Isoclad panels, each material has its price and thermal properties. We choose together based on your goal.
Surface to insulate
The total area of walls, ceilings or floors to treat is the main factor that determines material and labor costs.
Required thickness
The thicker the insulation, the higher the R-value, and the greater the energy efficiency. The Building Code sets minimums.
Access and complexity
Hard-to-reach spaces (attics, sub-floors, old walls) require more time and specialized equipment.
Step 5 — Installation day
An installation done by the book.
A durability guarantee for your exterior cladding
Guaranteed and certified insulation
When Les Entreprises EJA install your cladding, you walk away with much more than a beautiful facade. Every project is covered by the manufacturer warranty:
- Building Code standards : Installation compliant with the Quebec Building Code and RBQ requirements
- Rénoclimat eligible : Several of our insulation solutions qualify for Hydro-Québec’s Rénoclimat program
- Turnkey service : Full management: assessment, permits if required, installation and site cleanup
Materials per the manufacturer + 15 to 20 years.
Resources and articles
Find answers, tips and guides to better understand exterior cladding and your options.
Frequently asked questions
Everything you want to know
Have other questions? Our team is here to help, at no cost and with no obligation.
Which insulation is best for a home in Montreal?
Rock wool (Isoclad) is often recommended for the Quebec climate: it resists moisture, is non-combustible and delivers excellent thermal and acoustic performance. Cellulose is a high-performance eco-friendly alternative.
Is exterior insulation eligible for subsidies?
Yes, several of our solutions qualify for Hydro-Québec’s Rénoclimat program, which offers rebates based on the type and thickness of insulation installed. We help you check your eligibility.
What is the difference between interior and exterior insulation?
Exterior insulation wraps the entire structure and eliminates the thermal bridges created by wood studs. It is more thermally efficient and does not reduce indoor living space.
What R-value is recommended for walls in Quebec?
The Quebec Building Code recommends a minimum R-value of R-24 for above-grade walls in climate zone 6 (Montreal). We can often go further depending on your system.
How long does a full exterior insulation take?
For a standard single-family home, exterior insulation usually takes 3 to 7 days depending on the surface area and the complexity of the envelope.
Do you handle permits for insulation?
Yes, in some municipalities exterior insulation work may require a permit. We check local requirements and handle the process for you.
Does exterior insulation change the look of my home?
Yes, exterior insulation slightly changes the thickness of the walls. We usually combine it with new exterior cladding for a flawless result.
Related services
Our other services
Complete exterior cladding, insulation and renovation solutions for homes and commercial buildings.
Recommended service
Cladding installation
Installation of exterior cladding from every brand. Trim finishing and replacement of existing materials.
Learn more
Balconies and decks
Construction and renovation of balconies and decks. Framing and finishing.
Learn more
Garage door
Installation in a single day, steel, aluminum or wood, motorized or manual, warrantied up to 20 years.
Learn more
Have a project in mind?
We guide you from planning to final cleanup. Get your free quote — our team travels at no cost to assess your project.