Continuous Exterior Insulation – Change Is In The Air Why Stone Wool Matters There are many insulation products on the market designed for use as continuous exterior insulated sheathing in residential construction. However, there are several important differentiators in using stone wool rigid board. Energy Efficiency Using stone wool rigid board on the exterior of the sheathing results in residential buildings that consume less energy. It is designed to minimize the flow of heat through the enclosure and reduces thermal bridging. This will help builders and homeowners achieve better effective (in-situ) performance of the assembly, rather than relying on the ‘nominal’ R-value stated on packaging. Fire Resistance Additional benefits include excellent fire resistance. Stone wool rigid board product like ROXUL COMFORTBOARD ™ 80 is fire resistant to 1,177°C. It can act as a fire resistant barrier around the envelope of the structure, protecting the life safety of the occupants, as well as their investment. Fire resistant exterior insulation is especially important when using combustible claddings, in wildfire zones and in residential developments with close lot lines or in multi-family construction, as it helps mitigate against fires spreading from house to house. Noise Control When installed on the exterior, stone wool rigid board can help reduce the outside-in sound transmission, improving occupant comfort in areas near highways, railroads and airports. It’s an important part of overall “hidden” comfort of a high quality home. Durability Importantly, if used in sufficient thickness, stone wool rigid board used as continuous exterior insulation will raise the temperature of the sheathing to reduce condensation potential on the interior of the sheathing, which can cause mould, rot and odours. This approach also creates a vapor permeable assembly with drying potential to the exterior, preventing moisture in the assembly from becoming trapped. Building Science Support The benefits of exterior continuous insulation are supported by building science. Yet building science also tells us that not all products are created equal. Material selection and good design are vital. Stone wool rigid boards can offer significant performance advantages that homeowners value. Forward-thinking builders and renovators, meanwhile, are realizing there is opportunity in early adoption, as a growing contingent of homebuyers and homeowners seeking upgrades appreciate innovative, sustainable solutions that provide greater energy efficiency, increased safety, comfort and long-term durability. It’s well known that some things are worth that little bit extra. Thomas Hackett manages the Technical Support Center at ROXUL INSULATION. He is responsible for overseeing the technical support function for ROXUL products in various applications throughout North America.
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