You may have heard the term continuous insulation, but what is it really? Knowing what options are on the market in a world of increasing energy prices and demands for better energy efficiency is key to a project’s success and a well-designed, long-lasting building.
When thinking about a building’s energy efficiency, insulation should be top of mind. Use this guide to confidently make decisions on the proper insulation system for your future building projects.
What types of insulation systems are available?
Designing buildings is never easy and requires building owners and designers to make many decisions with different tradeoffs. Choosing the best insulation system and energy-saving option is one of those decisions. Whether you choose no insulation, cavity insulation, or continuous insulation, each of these options comes with different upfront costs regarding materials and installation labor as well as the energy cost to operate the building in the future.
Deciding to go without insulation saves a ton of money upfront because you’re not installing anything. The downside is that the building will cost much more to operate, will be less comfortable inside, and won’t last as long as an insulated building. If the building is conditioned, insulation is critically important and likely required by local codes.
Before choosing a type of insulative material, there are two general systems of adding insulation to a structure: cavity insulation and continuous insulation. Cavity insulation is installed in the cavities of stud wall framing, in between the metal or wooden studs.
Continuous insulation is applied to the exterior of the building framing and completely encapsulates the building. Both options are economical and result in a well-insulated building, but there is a significant difference that makes continuous insulation the optimal choice.
What is continuous insulation?
To understand what this means and fully appreciate the pros of continuous insulation, we must look at thermal bridging as it applies to continuous insulation.
Understanding Thermal Bridging and Continuous Insulation
Thermal bridging occurs when there is a path for energy transfer between building envelope components. Wood or steel studs in cavity insulation systems are a great example. When you use insulation in a wall cavity, the insulation only fills the cavities because studs (typically wood or steel) separate each cavity.
While the properties of wood and steel studs allow for some insulative properties, they are less so than actual insulation, so these breaks in the cavity insulation ultimately allow for energy to transfer through the studs and building envelope. Thermal bridging decreases the effectiveness of the cavity insulation as the energy moves through the connected conductive materials including the cladding and studs.
The key aspect of continuous insulation is that it completely wraps the exterior of the building framing rather than insulation just added to cavities between studs. Because the CI system encloses the entire wall — including the studs — the thermal bridging caused by studs can be eliminated in some CI systems.
That said, in some continuous insulation systems, thermal bridging will still occur via the through-wall and through-metal fasteners that connect the continuous insulation system and cladding to the structure. While certainly not as strong a thermal bridge as that created by wall studs, a significant amount of energy can escape via these fastening points. To correct this and make continuous insulation truly continuous, proper continuous insulation systems such as the GreenGirt CMH™ continuous insulation system with GreenGirt CMH™ Z-girt sub-framing, created by Advanced Architectural Products, completely eliminate thermal bridging by removing through-wall and through-metal fasteners.
What types of insulation are commonly used with continuous insulation systems?
As with cavity insulation, many different types of insulation can be used with continuous insulation.
Polyisocyanurate (Polyiso)
Polyiso is a type of thermosetting plastic foam. Its closed cells contain a gas that has low conductivity. Insulation systems with polyiso can take the form of rigid foam boards or laminated insulation panels.
Mineral Wool
This refers to two types of insulating fibers that are man-made. One type of mineral wool is rock wool. Rock wool consists of fibers spun from minerals like basalt. Slag wool, a material commonly used in insulation systems, consists of fibers spun from waste materials that form on the surface of molten metal.
Spray Foam
What are the benefits of continuous insulation?
- Elimination of thermal bridging
- Lower cost of installation
- Increased building life
- Increase in overall building health
- Built-in air, vapor and weather-resistive barrier for the building’s exterior
- Ensures building will easily hit energy standards
- Decreased risk of moisture damage
Elimination of Thermal Bridging
In the same way that a bridge gives people easy access across a waterway, thermal bridging gives heat an easy path to flow through insulation. Insulation acts as a thermal barrier to prevent heat movement, but conductive materials that interrupt the insulation can create a thermal bridge.
Thermal bridging decreases the composite R-value of the entire wall. A wall using R-20 insulation with steel studs can often end up with a composite R-value of 5 due to the thermal bridging from the studs. Best practice systems can completely eliminate thermal bridges and give the entire wall a highly effective R-value.
GreenGirt CMH sub-framing uses a composite metal hybrid material to provide a thermal break while maintaining the strength of steel. With two integrated metal fastener retention plates inserted into both flanges of the composite Z-girt, GreenGirt CMH is the strongest yet most thermally efficient best-practice solution.
Lower Installation Cost
A well-designed insulation system keeps both material and labor costs low. No building owner or contractor wants project delays, and issues seem to always cause a ripple effect. Using a GreenGirt CMH system saves time by combining many components into an easy-to-install system.
The GreenGirt CMH Z-girt inside the GreenGirt CMH continuous insulation system assembly consists of a composite metal hybrid Z-shaped girt, which enables rapid installation. The GreenGirt CMH system is typically four times faster to install than other insulation methods.
Decreased Moisture-Damage Risk
With through-metal fasteners, water vapor has the potential of condensing on the ends of the fastener. Best practice continuous insulation systems reduce the risk of any internal surface temperatures reaching the air’s dewpoint and forming moisture by eliminating the exchange of energy through thermal bridging. Combining these two features results in a better, longer-lasting structure.
The A2P Difference
Designing buildings isn’t easy. Finding the best continuous insulation system for your commercial building can be a tough decision, too. Our continuous insulation experts at Advanced Architectural Products are here to help you find the best continuous insulation solution to move your project forward smoothly.
That is why we created and manufacture various systems, including the GreenGirt CMH continuous insulation and SMARTci building enclosure systems. GreenGirt CMH and SMARTci aim to create more energy-efficient buildings. Our systems eliminate thermal gaps that other systems neglect and provide best practices for buildings with a continuous insulation system, creating the ultimate solution.
Some of the many benefits of our systems include:
- Installation speeds that are 4x faster than standard steel sub-framing
- Compatibility with most types of insulation and cladding
- Up to 98%-thermal efficiency
- ASTM E84 Class A approval (fire and smoke rating)
- UL 94 – Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
- Complies with NFPA 285 (National Fire Protection Association)
We offer various products to ensure your continuous insulation needs are met with each and every project. Contact us or request a custom quote today!
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