MULTI-FAMILY CONSTRUCTION
Build Higher, Smarter and Stronger.
Multi-family construction refers to the design and building of residential structures that house multiple separate living units within a single building or complex. These units are typically intended for multiple families or tenants and share common walls, roofs, or amenities.
Common building types are duplexes, triplexes, townhomes, apartments, condominiums, and mixed-use buildings that combine residential and commercial spaces.
Exterior Wall Application
Rmax® Thermasheath®-SI Structural Solution
Designed for higher density living, multi-family construction must meet strict fire, energy, and sound codes, and often uses wood, steel, concrete, or hybrid construction methods to balance cost, speed, and durability.
Delivering more on Every Level.
Multi-family construction meets high-performance polyiso insulation.
Polyiso continuous insulation is a rigid foam made from polyisocyanurate, a closed-cell and closed-matrix foam. It provides continuous thermal resistance across a building’s exterior walls or as a high-performance cavity insulation, minimizing heat transfer and improving energy efficiency.
This all-in-one insulation solution for multi-family builders—offering high R-value, air and water barrier protection, and built-in fire resistance in a single, code-compliant product. Its lightweight, sustainable design makes it easy to install while helping projects meet energy goals and construction timelines.
Cost & Time Advanatge
Polyiso delivers competitive pricing, reliable availability, and short lead times—helping multi-family builders control costs and stay on schedule with easier material planning.
Trusted & Code-Compliant
Polyiso is extensively tested and meets ASHRAE 90.1, IECC, and NFPA 285 standards, giving multi-family builders confidence in meeting energy, fire, and code requirements without compromise.
Streamline Your Build
Polyiso eliminates the need for separate air and water barriers, streamlining installation, speeding up construction, and lowering labor costs through reduced trades, time, and materials.
High R-Value per Inch
Polyiso delivers higher thermal efficiency with less material, enabling thinner walls that maximize interior space and boost ROI—ideal for energy-efficient, space-conscious designs.
True Continuous Insulation
Exceeds ASHRAE 90.1 and IECC c.i. requirements, acting as a sealed, all-in-one thermal, air, and water barrier system—ideal for multi-family code compliance and reducing failure points.
Ease of Use & Savings
Polyiso’s lightweight, easy-to-install design cuts labor, accelerates enclosure, and lowers costs— delivering faster timelines and reliable performance with less job-site complexity.
Multiple Products for Multi-Family Projects.
Thermasheath®
Efficient Insulation for the Building Envelope
A lightweight, energy-efficient insulation board with a closed-cell polyiso core and reinforced aluminum facers coated for added protection. It delivers high thermal performance, reduces structural loads, and installs easily—helping projects stay on schedule and within budget.
Thermasheath®-SI
Structural Stability with Continuous Insulation
Combines high-performance polyiso insulation with a structural, moisture-resistant layer—providing continuous thermal, air, and water barrier protection in one board. It replaces separate OSB and insulation, reducing labor, material costs, and install time while enhancing energy efficiency and envelope performance.
TSX-8510
Exposed Interior Insulation with a Durable, Clean Finish
A robust polyiso insulation board with reinforced aluminum facers and a white acrylic-coated face provides a clean, finished look for exposed interiors. Lightweight and energy-efficient, it simplifies construction by eliminating the need for thermal barriers—delivering fire-tested performance and code-compliant installation.
ThermaBase-CI™
Versatile Insulation with
Built-In Nailing Surface
A high-performance, energy-efficient insulation board designed to meet the demands of versatile projects. It features a closed-cell polyiso core bonded to a structural nailing surface—delivering continuous insulation and attachment support in a single, labor-saving layer.
Sealed and Secured.
Our R-SEAL tapes and flashing products seal insulation joints, windows, and doors to create a permanent, weather-tight barrier.
Paired with approved fasteners, screws, and washers, they ensure secure attachment and long-term performance across the entire building envelope.
Meeting Standards. Exceeding Expectations.
Rmax® insulation products are designed and tested to meet code requirements, so builders can insulate with confidence, knowing standards will continuously be met.
Exterior Wall Application // Rmax® Thermasheath Insulation
Continuous Insulation
Energy codes often require continuous insulation to eliminate thermal breaks. Polyiso achieves the required R-values while using thinner insulation boards.
Air Barrier Material
Building codes often specify requirements for air barriers, including criteria for air permeance and continuity. Taped polyiso board seams create an effective air barrier that meets requirements.
Moisture resistant
Polyiso insulation is inherently resistant to moisture absorption, helping to maintain its thermal performance over time requirements.
fire resistant
Using insulation with excellent fire resistant properties like polyiso, is crucial for meeting building code requirements and contributing to a fire-safe building.
Where Efficiency Meets Occupancy.
Polyiso insulation is the smart choice for multi-family construction—delivering high-efficiency performance while optimizing space, accelerating installation, and reducing material waste. Its built-in fire resistance, long-term durability, and sustainable design provide lasting protection unit after unit, floor after floor. From energy savings to code compliance, polyiso helps you build smarter, safer, and more efficient multi-family communities.
Space Optimization
Polyiso offers high thermal performance with minimal thickness, maximizing interior space in offsite construction where space optimization is crucial.
Fire Safety
Multi-family construction may be subjected to more stringent fire safety requirements due to proximity to other structures; polyiso has time-rated assemblies to meet these requirements.
Ease of installation
Polyiso is lightweight and easy to handle, facilitating efficient multi-family construction, where speed and efficiency are essential.
Durable Protection
Polyiso’s durability and high compressive strength make it ideal for multi-family construction, withstanding handling, stacking, and installation while maintaining long-term thermal performance.
Reduces Waste
Polyiso can serve multiple roles—thermal insulation, air barrier, and water-resistant barrier—builders can eliminate redundant materials, reducing jobsite clutter and packaging waste.
Sustainability
Polyiso reduces environmental impact with a high R-value per inch, allows for less volume of material produced & less job site trips - for the same square foot of wall.
Parking with Polyiso.
With its high R-value, excellent moisture resistance, and fire-resistant properties, polyiso is ideal for exposed parking garage ceilings.
Its durability and ease of installation provide a cost-effective, long-lasting solution for temperature control and mold prevention in a moisture-prone environment.
Exposed Ceiling Application
Rmax® TSX-8510
Project Profiles
Proven Success in Insulation Building Solutions
Explore our profiles to see how we’ve delivered exceptional insulation solutions and enhanced energy efficiency. Each profile highlights our unique challenges, our tailored solutions, and the measurable results achieved. Discover how our expertise can significantly impact your projects.
Passive Housing
Multi-Family & Residential Use
The copper pass apartments, a certified passive house
One of the five principles of achieving Passive House design is creating an air-tight construction. With this goal in mind, the developer, Costello Companies, used 3” Rmax® ThermaBase-CI continuous insulation to achieve the strict Passive House minimum R-Value of 38 instead of the Sioux Falls code minimum of R-21 for walls.
Townhomes
Multi-Family Residential Use
Grenadier Homes
Grenadier Homes builds townhomes, duplexes, and smaller multifamily products between two and three stories. Grenadier Homes primarily builds within the DFW metroplex, and their main products are 3 to 7-unit attached townhomes.