Green roofs are designed to support vegetation, which can add weight to the roof. Spray foam insulation is lightweight and can help support the additional load while providing effective insulation. It also contributes to energy efficiency, as maintaining a consistent temperature within the building is crucial when vegetation is present on the roof.
Then there are metal roofs in copper, aluminum, and various forms of steel, and they can be susceptible to temperature-related issues such as condensation. Spray foam insulation in the walls and roofs helps prevent condensation by providing an airtight barrier that reduces the potential for moisture buildup on the underside of the roof deck.
In Canada, the roofing systems exposed to extreme climates experience temperature fluctuations, such as very hot summers and cold winters. The use of spray foam insulation in walls and roofs can be especially beneficial. It helps maintain indoor comfort and reduces energy costs by complementing roofing systems that are designed for such climates.
The National Energy Code of Canada for Buildings (NECB) applies to large buildings and sets out the technical requirements for the energy-efficient design and construction of new buildings and additions. In the mandates of reducing greenhouse gas (GHG) emissions in buildings, builders are considering energy-efficiency focused roofing systems. These systems are designed with a strong focus on sustainability, such as cool, reflective, green roofs, and can benefit from the thermal performance of spray foam insulation in the walls.
Finally, there are roofing systems with complex designs. Buildings with intricate roof layouts, multiple levels, or unusual shapes may have more challenges when it comes to insulating the roof itself. In such cases, spray foam insulation in the walls and roofs can ensure there are no gaps or areas where heat transfer or air leakage can occur.
Addressing the requirements of a complex roof design
Insulation professionals will work closely with architects and builders to develop customized insulation solutions that address the specific challenges posed by complex roof designs. This may involve combining spray foam insulation with other insulation materials or techniques to achieve optimal results.
Exterior spray foam application technique
For example, consider a spray foam application technique where the foam is installed completely from the exterior and cuts the thermal bridge of the structure. The advantageous aspect of an assembly system of this kind is that architects and engineers will get all the required properties of a high-performance building envelope in a single product (insulation and an air, vapour, and water-resistive barrier in rain screen applications). This is a great accompaniment to a complex roof design as the spray foam can go right up to the parapet line and provides a much better performance regarding effective R-value or U-value as the thermal bridges are reduced. The steel studs can then be thinner and empty, leaving room for electrical systems.
