| The single largest contributor to energy waste in today's buildings is heat loss or gain through walls, roofs and windows As architects and engineers strive to reduce waste and conserve energy, rigid polyurethane and polyisocyanurate foam offers the optimal solution for effective insulation. Versatility and unequalled efficiency are the key features of rigid polyurethane or polyisocyanurate foam insulation. These unique and easily installed products have the highest R values, or insulating efficiency. for any given thickness among widely available building insulators. This efficiency contributes to significant energy savings throughout the life of a building and permits the use of smaller capacity cooling and heating equipment. In addition, polyurethane and polyisocyanurate foam's light weight reduces the load on structural members, permitting an array of design options such as thinner walls, lighter roofs and complex configurations.
Other important benefits of rigid polyurethane and polyisocyanurate foams include minimal moisture pick-up due to their closed-cell structure, blockage of air filtration, excellent dimensional stability which prevents shrinkage and settling, and no harboring of fungi and mildew Rigid polyurethane and polyisocyanurate foams are available as boardstock or as laminated panels with a variety of facers. They can also be fabricated on site by spraying or pouring into voids, such as wall cavities.
Rigid Polyurethane and Polyisocyanurate Foam Insulation: Applications and End Products
Wall Systems
Spray Polyurethane Foam. Polyurethane spray foams have no seams or joints, thereby eliminating drafts and heat leaks when applied on either the interior or the exterior of structural walls. Spray polyurethane foams will adhere to most substrates which are clean and free of grease, oil or loose scale. On the interior these foams can be used to fill cavities between studs or can be sprayed on block walls or other wall surfaces As with most insulations, these foams are installed with a weather-protective covering for exterior applications This can be achieved by a variety of materials.
Sheathing Board. Rigid polyurethane and polyisocyanurate boards are available in a variety of sizes and thickness' for application to either the exterior or interior of a building They can be used over structural sheathing (plywood), or as sheathing itself when the framing is adequately installed and supported Special nailing procedures have been developed for exterior foam sheathing and siding to accommodate the thicker composite. Boards can also be used in proper thickness' to fill cavities between studs.
Foam Core Panels. The most energy-efficient panels made today for curtain wall applications are comprised of polyurethane or polyisocyanurate cores in various thickness sandwiched between facers such as steel or aluminum. Because of their light weight, these panels are easy to handle and can be installed quickly With their high strength to weight ratio, they not only provide a minimal stress load to the structure, but actually contribute to the structural integrity of the building. Panels are available with a variety of attractive, durable facers in either flat or curved profiles to conform to unusual architectural needs.
Pour/Froth Foam. Rigid polyurethane foams can be poured or frothed in place on the job site. These foams can be used to fill cavities in concrete or cinder blocks, or in spaces between masonry walls Within minutes, the foam sets to a strong, closed-cell material that fills voids and does not shrink or settle.
Roofing Systems:
Polyurethane and polyisocyanurate foam insulation offers ease of installation when used for roof applications. An important advantage of polyisocyanurate roofing boards and spray polyurethane foam is that they can be installed directly on metal decks, provided their fire performance meets applicable building codes.
Spray Polyurethane Foam. Lightweight rigid polyurethane spray foam roofing is applied on the job site, creating a seamless insulated surface. Spray polyurethane foams adhere to almost any substrate. The substrate must be sound, clean, dry and free of loose material. In many retrofit applications, there is no need to tear off the existing root Spray polyurethane foams easily conform to complex surface configurations and, therefore, are particularly effective for domed roofs and for sealing around projections such as pipes, conduit. air conditioning equipment and bracing. Polyurethane foam also adheres to itself allowing layers to be built up to required thickness' and to create positive drainage pitches.
Board. Rigid polyisocyanurate roofing boards are lightweight and easy to handle, and can be manufactured to individual job specifications. Roofing boards are manufactured with a variety of flexible facers, including aluminum foil, glass skin, asphalt saturated felt, organic / inorganic felts, or multi-layer composites. Rigid facers, such as plywood, wafer board, or gypsum board, can also be used; these composite boards have exceptional structural strength. Polyisocyanurate roofing boards are suitable for either built-up roofing or single-ply membrane systems. Single-ply roofing systems can be fully adhered, attached by mechanical fasteners or they can be ballasted depending on the requirements of the application. Built-up roofing systems are typically adhered with hot asphalt. For flat roofs, the boards can be custom-tapered for proper drainage to eliminate pending water. |