Jun. 16, 2025
Machinery
Extruded polystyrene (XPS) closed-cell, rigid XPS insulation significantly improves the energy efficiency of unfinished exterior and interior walls for remodeling and new construction. In addition, the XPS boards provide thermal resistance with an R-value of 4.6 to 5.0, depending on their density, to create a comfortable indoor temperature and reduce utility bills. Moisture-resistant XPS panel insulation, with an absorption rate of 0.3 percent, resists moisture intrusion during and after application to help protect against damaging and unhealthy mold and rot.
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Lightweight, versatile, and simple to install, extruded polystyrene sheets typically come in 8-foot and 5-foot lengths, ranging from 16 inches to 4 feet wide and ¾-inch to 4-inches wide. The sheets come unfaced, and are covered with a foil facing, or laminated with plastic. The facing adds water resistance, and the lamination offers strength, but neither affects the sheets’ R-value. XPS sheets come in an array of colors (typically blue, green, and pink), based on the manufacturer, not insulating quality.
Flexible XPS boards come in various compressive strengths, making them ideal for numerous applications in all areas of the building envelope:
Manufacturing XPS insulation involves combining polystyrene crystals with special additives and a gas blowing agent. Manufacturers feed the mixture into an extruding machine that blends and melts it into a thick liquid. The liquid then gets processed through a die, which expands it into foam, shapes, cools, and trims it into standard-sized rectangular or square boards, with surfaces according to the intended use.
Specially designed machines produce XPS boards in smooth, rough, and grooved surfaces.
Demanding applications, like below-grade installation, utilize smooth XPS panels. Smooth, closed-cell XPS panels protect against absorption and diffusion due to long-term water exposure.
Rough surfaces increase the adhesion of the facade plaster.
Grooves in the XPS panel enhance wall drainage and thermal insulation for foundations.
XPS insulation offers many benefits contributing to an eco-friendly, healthy, durable, and safe building envelope.
XPS closed cell insulation, with an R-value of 4.6 and 5.0, gives it a high thermal resistance value, making it extremely energy efficient, by saving energy in buildings and reducing CO2 emissions.
100-percent recyclable XPS allows manufacturers to melt and reform the thermoplastic polystyrene resin into new XPS foam insulation.
XPS insulation’s high compressive strength allows it to withstand a high pressure of >300 kPa, so it can withstand more than lbs ft2 (30,000 kilos m2) with a maximum deformation of 10 percent, making it ideal for challenging applications:
XPS insulation provides water and freeze-thaw resistance, to protect the insulation’s thermal performance from damaging rot and unhealthy mold. In addition, the high permeability of XPS insulation makes it ideal for bathrooms and other high-moisture rooms.
Lightweight XPS insulation allows for easy application without irritating the worker’s skin.
Applying XPS insulation boards involves gluing the lightweight sheets to the substrate, which is much simpler than batts, blown-in fibers, or spray foam insulation. It is important to only use the manufacturer’s recommended foam-safe adhesive. The wrong glue can melt the foam. In addition, butt the sheets snugly together and seal joints with a manufacturer-recommended adhesive seam tape.
To insulate the stud, joist, and rafter cavities, cut the sheets to fit snug in the cavities, inserting them flush with the framing. To prevent airflow that can diminish the R-value, fill gaps along the edges with expandable insulation foam, safe for use with XPS. You can increase the R-value in two-by-six and larger dimension framing by inserting an additional layer of rigid foam insulation.
You can simply cut thin XPS sheets (less than 2-inches) by holding the straight edge of a utility knife along the cut line, scoring it about 3/4-inch deep. After scoring, lay the sheet on a table scored side up with the cut about 1-inch off the table. Firmly hold the sheet down and snap along the line. Trim the rough edges with the utility knife
For thicker sheets (greater than 2-inch), you will need a handheld drywall saw, or a table saw.
Installing 2-inch EPS boards on exterior sheathing requires additional furring strips or other structural supports. In addition, 2-inch XPS does not supply the strength needed to support the weight of the siding. Therefore, Sto strongly recommends that you check with your local building authority to determine the required type of additional support before installing 2-inch XPS as exterior sheathing.
Sto offers superior, simple-to-apply cladding solutions for applying XPS to an exterior wall system compared to XPS insulation boards: StoTherm ci XPS and StoPanel XPS ci. In addition, Sto XPS CI wall systems meet the requirements of fire, energy, and green building codes.
Sto XPS Wall Systems meets the requirements of NFPA 285 and NFPA 268 for use on non-combustible construction (Types I-IV).
Ch. 6: Energy Conservation, Efficiency and Atmospheric Quality (Section 606: Building Thermal Envelope insulation and Air Sealing) Alternative Compliance Path: ASHRAE 189.1-
Durable StoTherm® ci XPS, one of StoTherm® ci wall systems, is a drainable exterior insulation finishing system that incorporates high R-value XPS insulation into the wall system, and StoGuard® fluid-applied air and moisture barrier, with Owens Corning Foamular CI-C or Dow STYROFOAM™ Panel Core 20 insulation. StoTherm® ci XPS produces water and airtight air walls to ensure superior durability and thermal efficiency.
The unique, durable system sustains maximum curb appeal and lowers energy bills to save money. In addition, StoTherm® ci XPS can be finished with a variety of Sto textured finishes or specialty aesthetic finishes to accommodate your building’s design needs.
Lightweight StoPanel XPS ci prefabricated panels incorporate extruded insulation within the panel assembly, and create exterior wall cladding with excellent air and weather tightness, superior thermal performance, and long-lasting durability. In addition, architects and designers can choose from Sto’s numerous decorative and protective color and finish options.
StoPowerwall® ci energy-efficient stucco wall systems include StoGuard® air and water-resistive barrier, Owens Corning or Dow Type IV XPS insulation board, Sto DrainScreen, and Sto textured finishes.
StoPowerwall ci integrates continuous XPS insulation, air/moisture barrier, drainage, and Sto’s extensive collection of aesthetic surfaces in a hard coat stucco system.
Designers can use Sto’s unique Color System as a planning tool for choosing the colors for their architectural designs. The Sto Color System provides several benefits:
The Sto Color Collections include:
Sto’s extensive selection of finishes features pure white marble aggregate, acrylic polymers in various textures, and a wide range of color options to boost your design and harmonize with the surrounding environment. In addition, durable, high-performing Sto finishes resist dirt and water, protect the building’s facade, and enhance its curb appeal. Sto high-quality finishes include:
StoCast Finishes
Specialty Aesthetic Finishes
Further reading:If you want to learn more, please visit our website xps foam board machine.
StoSignature
Sto Traditional Finishes
iQ Technology
Sto offers superior, sustainable, simple-to-apply, multiple code-compliant cladding solutions for applying XPS to an exterior wall system compared to XPS insulation boards. Drainable StoTherm® ci XPS and StoPanel XPS ci create high-performing, sustainable, and attractive cladding systems, improve indoor comfort and air quality, save both money and energy, and ensure long-term durability:
High compression strength (100-KPA).
Excellent thermal insulation and long-lasting (thermal conductivity up to 0.028W/ M. K).
Hydrophobic and moistureproof (water absorption < 1%).
Good dimensional stability and weather resistance (life span 30-50 years)
There are four factors related to the thermal conductivity of the bubble wall, the thermal conductivity of the gas in the bubble, the radiation delivery rate of the bubble wall and the bubble, and the convective thermal conductivity of the gas in the bubble.
The second factor accounts for the largest proportion, about 60%.
More than 99%, 80% closed cell rate of foamed polyurethane (thermal insulation material).
Floor heating varies according to the scene of use, so the density requirements are different. The density of the extruded board for floor heating is generally about 35KG/m ³, the density of the extruded board for wall insulation is about 25KG/m ³, and the density of the extruded board for filling is about 45KG/m ³.
2cm extruded foam board can be equivalent to 100cm concrete and 120cm cement perlite.
The compressive strength of the extruded board is proportional to the density, and the greater the density, the greater the compressive strength.
It can be controlled at 100-KPA according to the density and other parameters. High-quality raw materials of the extruded board 35KG/m ³, compression can achieve 250-300KPA. Due to the process, the compression strength of the extruded board is very low when it is just off the line. With the increase of time, aging will increase the compressive strength, and then tend to stabilize, generally checked after 45 days of storage.
The water absorption is less than 1.5% and the moisture permeability is less than 3.5Ng/ (m.sPa), which makes the extruded board difficult to decompose and mildew.
When other conditions are the same, the density is proportional to the compression in a certain range.
Different standards have different classification methods, the common combustion properties of extruded boards are B1, B2, B3, B1 is non-flammable (oxygen index is more than 30%), B2 is flammable (oxygen index is more than 26%), B3 is flammable.
The environmental protection of extruded board depends on raw materials and flame retardants. Recycled raw materials are easy to contain free benzene, styrene, TVOC and other harmful substances, flame retardant HBCD is not environmentally friendly.
The long-term thermal resistance of extruded panels, like other polymer foaming materials, will also change over time, a phenomenon known as "ripening".
Specifications for floor heating: *600*20mm, *600*30mm, etc.
Specifications for building thermal insulation: *600*200mm, *600*30mm, etc.
Because the extruding board is continuously extruded, the length can be customized, and the width can only be 600mm before, but now the technological progress can do mm. As for the thinnest 10mm, the thickness can be as thick as 100mm.
The dimensional stability of the extruded plate is very good at high temperature (70 ℃) and low temperature (- 20 ℃), which can be controlled within 1%.
The indicators are: after 300 freeze-thaw cycles, the compressive strength of the extruded board is reduced by no more than 10% of the initial value, the long-term water absorption rate for building insulation is not more than 2%, and the long-term water absorption rate for civil engineering is not more than 5%.
Physical properties: apparent density, true density, dimensional stability, water absorption, water vapor permeability, freeze-thaw cycle.
Mechanical properties: compression, bending, shear strength, compressive creep, tensile strength.
Thermal properties: thermal conductivity, thermal resistance, long-term thermal resistance.
Raw material properties and production process: uniform cell, small gap and good performance of foaming agent are beneficial to reduce thermal conductivity.
apparent density: the thermal conductivity of density is inversely proportional to a certain range, and is proportional to a certain range after reaching the optimum density.
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