Roofing insulation sheets are used to keep the inside of a roof warm. Several types are available, including XPS, Polyisocyanurate, Graphite polystyrene, and Perlite. Each has its own benefits and drawbacks. Here are some things to consider before making a decision.
XPS
The proper use of insulation is crucial to energy efficiency and sustainable design. We’ll look at two popular types of insulation in this article: XPS and EPS. Both are commonly used in building envelope applications. However, they offer different benefits and drawbacks. To understand the differences between the two, we’ll compare their properties and how they are used in roofing.
XPS is more moisture resistant than EPS. It can absorb 0.3 percent of water by volume, whereas EPS can absorb anywhere from 2.0 to 4.0 percent. Depending on the composition of the material, XPS can achieve higher R-values than EPS. However, XPS can lose its R-value over time.
XPS roofing insulation sheets are often used under single ply roofing membranes. In such cases, the roofing insulation sheets should be covered with cover boards to prevent direct solar heat from damaging the roofing membrane. Another advantage of XPS insulation is that it can be reused after a roof leak has been repaired. Furthermore, XPS insulation sheets are very durable and can survive extreme temperatures.
XPS roofing insulation sheets are commonly used under all types of single-ply roofing membranes. Because it is exposed to the sun’s ultraviolet rays, it must be protected from solar heat. This is achieved by placing a cover board over it, which separates it from the membrane. Cover boards typically consist of gypsum board or high-density wood fiber. However, XPS roofing insulation sheets are sometimes exposed to UV rays, which can cause the insulation to fade or become dusty.
XPS roofing insulation sheets are a good option when you are concerned about the environment. They are environmentally friendly because they are made from a material that is able to resist water. They’re also recyclable once leaks are repaired, which minimizes tear-off materials.
Polyisocyanurate
Polyisocyanurate roofing insulation sheets are a lightweight and affordable option for roof insulation. They are made from a closed cell polyisocyanurate foam core bonded to coated glass fiber faces. They offer high thermal and compressive strength. These roofing insulation sheets are becoming an essential component of many roof systems. They offer adequate protection for the underlying insulation, and are easily installed by contractors.
Polyisocyanurate roofing insulation sheets can be purchased in a variety of sizes and thicknesses. Common sizes are 4-by-4-foot boards, which are ideal for adhered membrane applications. Alternatively, they are available in loosely laid membrane systems. Depending on the manufacturer’s requirements, different thicknesses are available, ranging from one-half inch to four inches. Also available are high-density polyisocyanurate cover boards in 1/4-, 3/8 and 1/2-inch thicknesses.
Polyiso roofing insulation sheets can also be found as rigid sheets. Rigid polyiso roofing insulation sheets can be applied over a wide variety of roof membrane assemblies. They are non-asphaltic, fire-resistant, and dimensionally stable. Depending on the application, they can be installed over existing shingles, or over concrete roof decks.
Polyiso roofing insulation sheets are a great choice for low slope roofs. These roofing insulation sheets provide consistent insulation and are also very cost-effective. They are also compatible with most roof coverings and attachment systems. They can also be applied on walls. These roofing insulation sheets are an economical alternative to fibrous foam plastic insulation.
The Polyisocyanurate Insulation Manufacturers Association was created to look for alternatives to CFCs and HCFCs. Founders of this association focused on transitioning the roofing insulation industry to non-ozone-depleting, ozone-friendly materials.
Graphite polystyrene
Graphite polystyren e roofing insulation sheets have excellent thermal insulation properties. They can significantly reduce heating costs and enhance the appearance of a building. Furthermore, they are incredibly durable and have been in use for over 50 years. This is the main reason why they are becoming more popular for use on roofing.
Unlike conventional foam insulation, graphite EPS roofing insulation sheets have an embedded graphite layer. This layer increases the insulation’s R-value by up to 20%. Its reflective quality also enhances energy efficiency. Unlike traditional foam or fiberglass roofing insulation, it also prevents heat from leaking through the roof.
Graphite polystyren e roofing insulation sheets are available in two sizes. They can be 2 ft x 8 ft or 4 ft x 8 ft. Both sizes are available in different thicknesses.
GPS roofing insulation sheets are fire-rated and code-approved. Their graphite content helps reflect radiant heat energy. They also retain their R-value over the long run. This is another important feature that makes them superior to EPS. Graphite polystyrene roofing insulation sheets are manufactured similarly to EPS, but they contain high-purity graphite particles. The high-purity graphite particles enhance the reflective and absorption of radiant energy.
Perlite
Perlite roofing insulation sheets are made with a mixture of perlite, cellulose binders, and waterproofing agents. They are available in sheets that are 2′ x 4′, and can be up to 1/2″ thick. They are used as an underlayment or the base layer for different roofing membranes. They can also be used as a top layer over existing roofing insulation.
Perlite is a lightweight material that has a low bulk density. It is also fire, rot, and damp proof. It also improves the thermal performance of floors and masonry walls. It is commonly used for insulation in the foundry and steel industries. It is also a good choice for landscaping applications.
Perlite is an excellent choice for a variety of roofing applications. Its density is low, resulting in excellent energy savings for a variety of applications. One of the advantages of perlite is its low cost. The product is made from recycled paper waste, and it has an R-value that is consistent throughout its lifetime. It is available in sheets that are 2” x 4” thick.
The process of manufacturing perlite roofing insulation sheets is continuous, using a Fourdrinier machine. This machine creates a dilute aqueous slurry that contains expanded perlite, gypsum, fiber, and binder. The slurry is then pumped onto a moving screen where it forms a wet mat. In a subsequent step, external heat drives off any remaining moisture.
Perlite roofing insulation sheets can be used to cover commercial buildings. However, these are less popular than single-ply roofing systems, as they require surface treatments and coatings. These materials are also prone to absorbing asphalt during installation.
Extruded polystyrene
Extruded polystyrening, also known as XPS, is a common material used in the construction of roofing and floor insulation. It has a high R-value, and its closed cell construction minimizes heat transfer through the envelope of a building. This material is typically available in a variety of thicknesses and can be used to insulate interior and exterior walls. It is manufactured by a fully automated extrusion process.
One of the most prominent advantages of extruded polystyrene is its high compressive strength. The material can handle pressure up to 900 kPa without buckling. Its superior compressive strength makes it a desirable material for both roofing and foundation applications. It is also extremely lightweight and easy to handle. Extruded polystyrene roofing insulation sheets can be used in both flat and pitched roofs.
Another advantage of XPS is its light weight and low cost. While expanded polystyrene is flammable, it is often combined with noncombustible material to provide added fire protection. It is also highly resistant to extreme weather conditions. In addition, it does not warp or lose thickness in a fire. If you’re looking for an effective roofing insulation, extruded polystyrene is an excellent choice.
XPS is an industry-leading product that offers several benefits. It is easy to process, has low thermal conductivity, and is suitable for damp environments. It also provides great insulation and channels water away from the building’s interior. XPS roofing insulation is available in a variety of sizes, including precut roofing panels for trusses.
XPS roofing insulation sheets are usually used in combination with a white, cool roofing membrane. In some cases, XPS roofing insulation sheets are mechanically attached to the roof with a slip sheet. Alternatively, they may be installed over a gypsum cover board.