Most sheets used in suspended structures have some type of top coat applied to the exterior or coating for easy cleaning. The top layer provides a hard surface on the outside of the material, forming a barrier that helps prevent dirt from adhering to the material, while allowing the fabric to be cleaned with water. As the material ages, the top layer will eventually erode, exposing the fabric to dirt and making it difficult to clean. The thicker the top layer, the longer it will last. However, liners that are too thick will become brittle and crack if they need to be folded when removable.

There are several commonly used finishes:

• - PVF film lamination is made up of polyvinyl fluoride") (commercially known as Tedlar). It consists of a layer of laminated film added to the PVC fabric during the manufacturing process. The result is a thicker fabric that can resist weathering and chemical agents better than other untreated fabrics. Its self-cleaning ability allows it to repel aggressive agents such as acid rain, graffiti and bird droppings. Due to these characteristics, it can often be found in use in industrial areas, desert regions and coastal areas. The thicker coating has a slow erosion rate, resulting in a lifespan of approximately 25 years, depending on environmental conditions. This top layer is flexible, creating a strong and consistent bond to the PVC. can be welded. The seams are not overlapped, but spliced with an additional welded seam, and the underside of the fabric, which has no coating, is subsequently sealed.

• - Acrylic topcoat is the most economical and widely available finish used. Its spray application provides a glossy finish and considerable resistance to ultraviolet degradation. Because the coating is thin, the material is easy to manufacture and can be repaired by hot air or high frequency welding. Depending on environmental conditions, an acrylic finish will give the fabric a lifespan of 10 years or more. Acrylic finishes are ideal for fabric structures and can be found in sheets used in trade show pavilions, temporary tents, and portable warehouses.

• - The PVDF finish is composed of a mixture of fluorine, carbon and hydrogen. The combination of fluorine and carbon provides superior resistance to UV degradation and chemical damage than acrylic topcoat. PVDF coated fabrics also hold color longer than those coated with acrylic. PVDF fabrics resist algae and fungus, and also have self-cleaning properties that make them easy to maintain. These coated fabrics are flexible, resist cracking, are easily handled, and generally have a lifespan of 15 to 20 years, depending on environmental conditions. PVDF is chemically incorporated into the PVC and polymers used, reducing color options. Because white is the only standard color, other color options are limited and must be specially manufactured. Due to the chemical properties of the coating, it must be abraded to expose the PVC before welding. This also increases manufacturing costs. Repairs with the cover mounted are also difficult, as the membrane must be manually scraped before repair.

• - The PVDF/PVC top layer is essentially a dilution of the PVDF top layer which makes the finished sheet less expensive to manufacture. The finished fabric can be welded without having to abrade the material, reducing costs. However, because PVDF is diluted, the longevity and ability to resist environmental factors is reduced. This results in a general life expectancy of 10 to 15 years. These materials are also available in various colors, but are subject to limited manufacturing runs.

• - Tio2 (Titanium dioxide) "Titan W" top coating: TITAN W is a surface finish whose formulation was prepared by Naizil S.p.A. in collaboration with the Department of Chemical Engineering of the University of Padua.

When discussing the properties of sheets for use in a structure, there are several terms that are commonly used:.

• - Tensile strength is a basic indicator of mechanical strength. It is essential for architectural fabrics that function primarily in tension.

• - Tear resistance is important because if a fabric breaks once placed, it will generally do so by tearing. This can occur when a local concentration of stresses or local damage results in the failure of a series of fibers, increasing the stress in the remaining yarns.

• - Adhesion strength is a measure of the strength of the bond between the base material and the coating or film laminate that protects it. It is useful for evaluating the strength of solder joints used to connect strips of material when they are assembled.

• - Flame retardant, which does not have the same meaning as fire retardant. The fabric containing a flame retardant coating can withstand even a very high temperature point source. However, it can burn in the event of a large fire.

• - The extensible fabric allows free forms to be used in the construction of buildings, since it is a flexible material.[7]​.

The properties of a fabric determine its most appropriate use, such as the relationship between tension and deformation (unit load versus unit elongation), expected useful life, material joining systems (welding, gluing, etc.) and the behavior of the fabric with respect to fire.

Stress versus strain data should be obtained both uniaxially and biaxially. This information characterizes the tissue in terms of stiffness, elasticity and plasticity. This is essential information to determine the response of the material under the loads that it must support and transmit. Shear stresses, shear deformation and Poisson's ratio, although difficult to obtain, are essential when analyzing a fabric as a structural material.

• - General solar, optical and thermal performance data.

• - Acoustic data.

• - Dimensional stability.

• - Possibility of being colored or painted.

• - Ease of cleaning.

• - Strength and stability of the seams.

• - General handling capacity, including abrasion resistance and foldability.

Suspended shell structures can have multiple advantages over traditional buildings in certain scenarios. In some cases, lighting is not required as the sheets used can be translucent, making them an energy efficient solution. Another of its strong points is its mobility, being able to be disassembled to be transported and relocated again to another location. In addition, its cost is approximately half of what a traditional structure costs.

Suspended sheet metal ceiling in Tulsa, Oklahoma:.

membranes

Most suspended decks are composed of woven "Fabric (textile)") materials, covered with membranes reinforced with synthetic fibers to increase their strength, durability and weather resistance. Among the most used materials are polyester laminated or coated with polyvinyl chloride (PVC) and glass-reinforced plastic fabric coated with polytetrafluoroethylene (PTFE).[5]​.

cotton canvas

The traditional fabric for small fabric structures such as tents is a lightweight cotton weave called twill, although lightweight canvas or heavy-duty waterproof tarps are also used.

Polyesters

Strength, durability, cost and stretch make polyester material the most widely used in sheet structures. Polyesters laminated or coated with polyvinyl chloride films are typically the least expensive option for long-term construction.

Laminates generally consist of vinyl films on woven or interlocked polyester scrims (called scrims&action=edit&redlink=1 "Scrim (material) (not yet drafted)") or substrates), while vinyl-coated polyesters generally have a high-fiber-density, high-strength base fabric, coated with an adhesion substance that provides additional strength. Prestressed fabric is made by placing polyester fabric under tension before and during the coating process. This results in a fabric with greater dimensional stability.

Vinyl laminated polyesters

A laminated fabric is generally composed of a reinforcing polyester mesh pressed between two layers of unsupported PVC film. However, for most suspended structure uses, two or more layers of fabric or film are arranged together by heat, pressure, and an adhesive to form a single layer.

With an open-weave polyester mesh or netting, the exterior vinyl films adhere to themselves through openings in the fabric. However, heavier fabric meshes are too tight to allow the same binding. In this case, an adhesive is used to bond the outer films to the base fabric.

Good chemical bonding is essential for both preventing delamination and developing seam strength. The seam is created when vinyl-coated fabrics are welded together. The adhesive allows the seam to withstand the shear stresses and loading requirements of a structure at all temperatures. The adhesive prevents moisture from penetrating the fibers of the mesh, which also prevents fungal growth or freezing that could affect the adhesion of the outer coating to the mesh. Adhesives are water-based to comply with EPA regulations.

Open weave meshes generally make for a more economical fabric, although this may also depend on the number and type of features required in the vinyl. Almost any permanent, long-lasting color can be incorporated into vinyl. However, the more features are added, the higher the cost of the membrane.

Vinyl Coated Polyester

Vinyl coated polyester" is the most widely used material for flexible sheet structures. It is composed of a polyester mesh, a binding or adhesive agent, and PVC outer coatings. The mesh supports the coating (which is initially applied in liquid form) and provides tear strength, elongation, and dimensional stability of the resulting fabric. Vinyl coated polyester is manufactured into large panels by heat sealing an overlapping seam with a radio frequency welder or air sealer. hot. A suitable seam will be able to withstand the load requirements of the structure. The seam area must be stronger than the original coated fabric when testing for tensile strength.

The tensile strength of the base fabric is determined by the size (denier) and strength (tenacity) of the threads and the number of threads per linear inch or meter. The larger the thread and the more threads per inch, the higher the tensile strength of the finished product.

The bonding agent acts as a chemical bond between the polyester fibers and the outer coating and also prevents the fibers from absorbing water, which could result in freeze-thaw damage to the fabric.

PVC (vinyl Organisol or Plastisol) coating liquid contains chemicals to achieve the desired properties of color, water and mildew resistance, and flame retardancy. Fabrics can also be made that contain high levels of light transmission or can be made completely opaque. Once the coating has been applied to the mesh, the fabric is passed through a heating chamber that dries the liquid coating. PVC coatings are available in a wide variety of colors, although non-standard colors can be expensive. Colors may be subject to minimum order runs which allow the coating machine to remove traces of any previous colours.

Fiberglass

Woven fiberglass coated with PTFE (Teflon or silicone) is also a widely used base material. Glass fibers are arranged in continuous filaments, which are then grouped into threads. The threads are woven to form a substrate. Fiberglass has high tensile strength, behaves elastically, and does not suffer significant stress relaxation or creep. The PTFE coating is inert, and can withstand elevated temperatures, from 100 to 450 degrees Fahrenheit (38 to 232°C). It is also immune to radiation and can be cleaned with water. PTFE fiberglass is also Energy Star and Cool Roof Rating Council certified. During scientific testing by its solar properties, it was found that PTFE fiberglass membranes reflect up to 73 percent of the sun's energy while retaining only seven percent on their outer surface. Certain types of PTFE fiberglass can absorb 14 percent of the sun's energy while allowing 13 percent of natural light and seven percent of radiated energy (solar heat) to be transmitted.[6]​.

Due to their energy efficiency, high melting temperature, and lack of creep, fiberglass-based fabrics have been the material of choice for stadium domes and other permanent structures, particularly in the United States, although polyester structures can be equally durable when constructed correctly.

Olefin/polyolefin

Various polymers consisting mainly of polyethylene, polypropylene or combinations of the two are available for sheet roof structures.

PVDF fabric

PVDF woven fabric is also available for sheet structures.

ePTFE fabric

Likewise, there are woven ePTFE sheets available for the construction of suspended structures.

Opaque fabric

Blackout&action=edit&redlink=1 "Blackout (fabric) (not yet drafted)"), a fabric also known as blocking material, is an opaque fabric consisting of a laminate that sandwiches a layer that completely prevents the passage of light between two white outer layers. It allows passive regulation of the temperature and lighting of a structure by not allowing light to penetrate through the top or walls. The opaque quality also prevents stains, dirt, repairs or slightly uneven panels on the outside of the structure from being noticeable from the inside.

Most sheets used in suspended structures have some type of top coat applied to the exterior or coating for easy cleaning. The top layer provides a hard surface on the outside of the material, forming a barrier that helps prevent dirt from adhering to the material, while allowing the fabric to be cleaned with water. As the material ages, the top layer will eventually erode, exposing the fabric to dirt and making it difficult to clean. The thicker the top layer, the longer it will last. However, liners that are too thick will become brittle and crack if they need to be folded when removable.

There are several commonly used finishes:

• - PVF film lamination is made up of polyvinyl fluoride") (commercially known as Tedlar). It consists of a layer of laminated film added to the PVC fabric during the manufacturing process. The result is a thicker fabric that can resist weathering and chemical agents better than other untreated fabrics. Its self-cleaning ability allows it to repel aggressive agents such as acid rain, graffiti and bird droppings. Due to these characteristics, it can often be found in use in industrial areas, desert regions and coastal areas. The thicker coating has a slow erosion rate, resulting in a lifespan of approximately 25 years, depending on environmental conditions. This top layer is flexible, creating a strong and consistent bond to the PVC. can be welded. The seams are not overlapped, but spliced with an additional welded seam, and the underside of the fabric, which has no coating, is subsequently sealed.

• - Acrylic topcoat is the most economical and widely available finish used. Its spray application provides a glossy finish and considerable resistance to ultraviolet degradation. Because the coating is thin, the material is easy to manufacture and can be repaired by hot air or high frequency welding. Depending on environmental conditions, an acrylic finish will give the fabric a lifespan of 10 years or more. Acrylic finishes are ideal for fabric structures and can be found in sheets used in trade show pavilions, temporary tents, and portable warehouses.

• - The PVDF finish is composed of a mixture of fluorine, carbon and hydrogen. The combination of fluorine and carbon provides superior resistance to UV degradation and chemical damage than acrylic topcoat. PVDF coated fabrics also hold color longer than those coated with acrylic. PVDF fabrics resist algae and fungus, and also have self-cleaning properties that make them easy to maintain. These coated fabrics are flexible, resist cracking, are easily handled, and generally have a lifespan of 15 to 20 years, depending on environmental conditions. PVDF is chemically incorporated into the PVC and polymers used, reducing color options. Because white is the only standard color, other color options are limited and must be specially manufactured. Due to the chemical properties of the coating, it must be abraded to expose the PVC before welding. This also increases manufacturing costs. Repairs with the cover mounted are also difficult, as the membrane must be manually scraped before repair.

• - The PVDF/PVC top layer is essentially a dilution of the PVDF top layer which makes the finished sheet less expensive to manufacture. The finished fabric can be welded without having to abrade the material, reducing costs. However, because PVDF is diluted, the longevity and ability to resist environmental factors is reduced. This results in a general life expectancy of 10 to 15 years. These materials are also available in various colors, but are subject to limited manufacturing runs.

• - Tio2 (Titanium dioxide) "Titan W" top coating: TITAN W is a surface finish whose formulation was prepared by Naizil S.p.A. in collaboration with the Department of Chemical Engineering of the University of Padua.

When discussing the properties of sheets for use in a structure, there are several terms that are commonly used:.

• - Tensile strength is a basic indicator of mechanical strength. It is essential for architectural fabrics that function primarily in tension.

• - Tear resistance is important because if a fabric breaks once placed, it will generally do so by tearing. This can occur when a local concentration of stresses or local damage results in the failure of a series of fibers, increasing the stress in the remaining yarns.

• - Adhesion strength is a measure of the strength of the bond between the base material and the coating or film laminate that protects it. It is useful for evaluating the strength of solder joints used to connect strips of material when they are assembled.

• - Flame retardant, which does not have the same meaning as fire retardant. The fabric containing a flame retardant coating can withstand even a very high temperature point source. However, it can burn in the event of a large fire.

• - The extensible fabric allows free forms to be used in the construction of buildings, since it is a flexible material.[7]​.

The properties of a fabric determine its most appropriate use, such as the relationship between tension and deformation (unit load versus unit elongation), expected useful life, material joining systems (welding, gluing, etc.) and the behavior of the fabric with respect to fire.

Stress versus strain data should be obtained both uniaxially and biaxially. This information characterizes the tissue in terms of stiffness, elasticity and plasticity. This is essential information to determine the response of the material under the loads that it must support and transmit. Shear stresses, shear deformation and Poisson's ratio, although difficult to obtain, are essential when analyzing a fabric as a structural material.

• - General solar, optical and thermal performance data.

• - Acoustic data.

• - Dimensional stability.

• - Possibility of being colored or painted.

• - Ease of cleaning.

• - Strength and stability of the seams.

• - General handling capacity, including abrasion resistance and foldability.

Suspended shell structures can have multiple advantages over traditional buildings in certain scenarios. In some cases, lighting is not required as the sheets used can be translucent, making them an energy efficient solution. Another of its strong points is its mobility, being able to be disassembled to be transported and relocated again to another location. In addition, its cost is approximately half of what a traditional structure costs.

Suspended sheet metal ceiling in Tulsa, Oklahoma:.