Because PU is much more common than PE, when the outdoor industry says polyurethane, theyre talking about poly. With the DNLF seam, each stitch goes through four layers of fabric. Now a contractor can clean the roof, and add more coating to bring the level of coating back to 30 mils. Because of hydrolysis, fabrics with PU coatings essentially have a shelf life. Call Roofer's Guild at (877) 532-3852 and Learn About Polyurethane Roof Coating! This happens because of the way the coating affects the, of the fabric. Polyurethane coatings. However, polyurethanes can produce stronger, more robust products with an almost endless range of physical properties and small to large, complex geometries. However, it can be problematic if youre camping for a long time in especially wet areas or in a spot where water pools under your tent. - UV resistant. It is also the core component of our standard urethane system. In some cases, the damage may even require roof replacement. This also means that silicone imparts an unmatched level of mold/mildew resistance. Local roof sealing professionals typically charge between $50 and $80 per hour when installing or repairing a roof. When it comes to sealants-products used to seal gaps and holes to make something air and water-tight-there are only really two options: polyurethane vs. silicone-based caulks. A polyurethane roof coating emits a strong, xylene-based odor. Specific chemical additives can be incorporated in silicone during its raw, liquid state to achieve a range of properties, including tear strength, Commonly cast or Reaction Injection Molded (RIM), Can be engineered into many types of solid and, Hardness levels can range between Shore A, D, 00 scales, Foam is often considered a specialty material, due to high costs & processing difficulties, Hardness levels typically range in Shore A scale, Exhibits high resistance to extreme temperatures, but often displays low tensile strength, abrasion resistance, & wear and tear properties, Material costs are significantly higher, especially for foam, Offers a more economical setup for small & large runs. APOC, Inc. - Asphaltic coatings. Polyurethanes typically have a higher solids content than silicone roof coatings. Silicone, on the other hand, is typically best for products that must withstand high resistance to extreme temperatures. However, it can be problematic if youre camping for a long time in especially wet areas or in a spot where water pools under your tent. Silicone roof coatings have been around since the 1970s, and they were often used as part of spray polyurethane foam applications. This distributes the stress on the fabric over a larger area, thus reducing the force and making the fabric less likely to tear. We introduced our first urethane coating, U66 high solids polyurethane, in 1970. Even if you can get rid of the smell, your coating is still on its way out and wont stay waterproof for much longer. Silicone can resist intermittent temperatures of up to 230C, or up to 280C if a heat stabiliser is added into the raw material. John DAnnunzio (john_paragon@ameritech.net), president of Paragon Consultants and Paragon Roofing Technology, Inc., has more than 20 years experience as a construction consultant specializing in roofing and waterproofing materials application and field performance. Coating involves the application of a liquid that adheres to the fabric and then is cured, leaving the fabric waterproof. Compared to other roof coatings, these coatings are more likely to hold up well against impacts. During extended hard rain, some water can wick in through the thread, but we've only seen this issue with consistent heavy rain that lastsat least several hours. Usually its nylon in higher-end tents and polyester in less expensive tents. This episode loo. Over time, the PU coating reacts with moisture in the air (this process is accelerated by heat) and splits the polyester urethane molecule. Aromatic coatings, on the other hand, are less expensive and don't hold up well against UV rays, which is why they are often used as a base coat. However, if theres enough moisture in the environment, water will eventually saturate the PU coating and go into and through the fabric, causing the coated fabric to leak. This doesnt factor in much to most companies decisions to coat their fabrics with PU, as its assumed that something else on the tent will break or youll upgrade before hydrolysis becomes a problem. They can effectively withstand the daily expansion and contraction (thermal movement) of roof structures as well as the damaging effects of ponding water. 4 Types of Roof Coatings: How to Pick the Best for Your Facility, Feedback is a managers most powerful tool. Each type is best suited for specific roofing environments and applications. Package size (gallons): 4.75 gal. Sil/sil fabrics often have significantly higher tear strengths than the same fabric with a PU or PE. After years of searching, we finally found a 20D lightweight PE-coated fabric that was strong enough to use on the floor of our Portal tent. It helps cement bonds, strengthen staff performance, and preserve culture. With PU coatings, you can keep slapping coat after coat on the outside of the last coat, which is how you can get such high HH results. Overall, urethane roof coatings adhere well to most flat roofing . Also, because the two coatings are not applied simultaneously, achieving the ideal thickness on each side of the fabric is a tricky balancing act. choosing a selection results in a full page refresh. As you would expect, ripping through five yarns at once is harder than ripping through one, and a fabric with more slippage will have a higher tear strength. For more information about hardness and how its measured, click here. Extend the service life of SPF with white roof coatings. - high movement. Used for aerospace. Polyurethane Coatings vs. Silicone Coatings Both polyurethane and silicone are elastomeric roof coatings that are designed to stretch and contract with the movement of the roof. Outdoor Use: If the area is exposed to sunlight, the elements, or water, then silicone is far superior. This hasnt been an issue in our experience. Cast molding with thermoset polyurethane can offer a significant amount of customization to meet specific design and performance requirements, while RIM combines the superior properties of thermoset polyurethanes with the adaptability of injection molding techniques. Thats not so easy with silicone, so the main drawback of silicone coatings is that its hard to get water columns much higher than 1500mm when youre using lightweight fabrics. In this article, well be taking a journey of discovery through the most common waterproof coatings used in tents: polyester urethane (PU), polyether urethane (PE), and silicone, and combinations thereof. PE coatings are not nearly as easy to come by, as they havent been fully embraced by the industry yet. This reduces the cure time of the acrylic coating to a few minutes, thereby eliminating the possibility of coating run-off if there is precipitation directly after application. A good way to visualize this is to picture a tall tube with a piece of fabric stretched across the bottom end. There are a few minor issues with silicone from a functional standpoint. It is also slippery when wet and tears easily in the right conditions. It may take a decade or more, but even if you treat your tent with the utmost care, it will eventually hydrolyze. Get it as soon as Mon, Jun 6. Thats also a huge no-no. SPF Spray polyurethane foam is sprayed as a monolithic layer over an existing system. First, the tear strength of sil/PU fabric is still lower than the tear strength of the fabric before coating because of the PU. This means the stress is much more concentrated and the fabric is more likely to tear. This sprayed-in-place Polyurethane Foam (SPF) applies as a liquid and expands into a foam to create a seamless, single layer of roof insulation. PE has several advantages that make it a great choice for floor fabrics. Perhaps the biggest obstacle preventing sil/sil fabric from gaining market share is that silicone coatings cant be combined with fire retardants to meet CPAI-84 standard. A polyurethane roof coating with an aromatic base coat and an aliphatic top coat can provide a high level of UV protection, thus ensuring that the roof stays safe from damage. Polyurethane acrylic coatings are durable, flexible, and can withstand ponding water. However, if youre hoping to be using your tent a decade from now, then it would be a good idea to seek out tents without PU coatings. Single needle seams will need to be sealed after construction with a liquid seam sealer. You may have gathered from this that at SlingFin, we prefer to use sil/sil fabrics wherever possible. To propagate the tear, youll have to rip through several yarns at once, rather than one yarn at a time. Polyurethane Foam. Thus, these coatings are good for clients who may be concerned about pooling water damaging their roofs. However, if theres enough moisture in the environment, water will eventually saturate the PU coating and go into and through the fabric, causing the coated fabric to leak. Silicone: Water Based Elastomeric: Butyl Elastomeric: Water Based Acrylic Elastomeric : Water Based Siliconized Acrylic: Coverage: 100 sq ft/gal . Second, as we discussed in our. PU coatings get in between the yarns, and lock them in place. A seam style known as double needle lap-felledreduces the need to seal or tape the seam when you're using sil/sil fabrics. While this odorous vapor is not harmful, it can be quite unpleasant for a building's occupants. Wind and rain Weather is a large factor when dealing with roof repairwind and rain can be an enemy to a roof repair job. The molecules that comprise organic polymers have carbon backbones, whereas silicones are built around a highly stable Si-O bond. Sil/sil fabrics often have significantly higher tear strengths than the same fabric with a PU or PE. Polyurea is sprayed on to the roof, and it has a relatively low curing time. When you visit any website, it may store or retrieve information through your browser, usually in the form of cookies. Typically, a polyurethane sealant will produce effects that last between 5 and 10 years. CALL TODAY! hydrolysis). They also hold their shape well over time. Polyurethane is one of the most powerful coatings, so its suitable for many different situations. Extra care must be taken to make sure its absolutely, positively bone-dry before you put it away for more than a day or two. Better water resistance: Use silicone in areas where moisture is present. They are also more impact-resistant than other coating materials, making them ideal for use on roofs with high-traffic areas. Silicone is much more inert than polyurethanes, which means it's less prone to react with other compounds (e.g. Silicones are inorganic and will not be broken down by UV. This problem can be addressed by applying very thick layers of PU, meaning the water will take longer to penetrate the fabric. . "the only tent we'd want on astormy trek" - Outside Magazine, Use left/right arrows to navigate the slideshow or swipe left/right if using a mobile device, CrossBow Four-Season (CrossBow R/S) (2015-2020), One of the most important functions of a tent is (obviously) to keep you dry. We have never seen a case of mold growth on a silicone-coated fabric (again, this doesnt mean you should put your tent away wet! Issues during the installation process are less likely to occur if the spray equipment is properly cleaned and maintained. Aldo Products Company - Acrylics, silicone, polyurethane, and butyl thermoplastics with coatings, primers and sealants in all chemistries. The first issue we have with PU is that it decreases the tear strength of the fabric to which it is applied. Seam tape is what keeps sil/PU fly fabrics from leaking through the needle holes created when the tent is sewn. As. There are two types of urethane roof coatings: aromatic and aliphatic. This isnt to say that non-PU-coated tents should be stored wet. Its the only PE-coated fabric weve seen under 70D with a tear strength high enough for us to use in a tent. The highly-reflective, glossy finish of GacoFlex S20 and S21 Silicone Roof Coatings can help reduce energy costs. . Because of their excellent adhesion, ALDOCOAT polyurethane roof coatings are ideal for roof restoration, which can save a building owner 50 - 70% compared to the cost of complete roof replacement. This is almost always accomplished by using waterproof fabrics. These coatings also, however, lose mil-thickness from weathering, require application in ambient temperature of above 50 degrees F, and cannot withstand ponding water. 2. This distributes the stress on the fabric over a larger area, thus reducing the force and making the fabric less likely to tear. Sometimes you even have to call brands to get a straight answer. (814) 200-9269 ken@ . PU can achieve high hydrostatic head ratings, it can accept fire retardants to meet CPAI-84 standard, its inexpensive, and it doesnt reduce the fabrics tear strength as much as PE coatings do. The propensity of a coating to undergo hydrolysis, or hydrolyze, is called hydrolytic stability. Roof coatings should be strong enough to last but also elastic enough to adjust to changes in the shape of the roof. . We use PE-coated fabrics on the 70D and 210D floors of our expedition series tents, because those fabrics start out with an extremely high tear strength, so the burliness of the fabric itself is more than enough to compensate for the reduction in tear strength by the PE coating. Aluminum Roof Coating for the yarns to slide over one another. When you try to tear a fabric, slippage allows the yarns to bunch up, rather than remaining fixed in position. Rust-Oleum 301903 10 Year Elastomeric Roof Coating white gal. In contrast, polyurethane will start to degrade at 80C which is not ideal for any high-temperature environments. Uncoated (i.e., breathable) tent canopy fabrics will absorb water and grow mold, but at least your silicone or PE-coated floor and fly might be spared. When evaluating silicone vs polyurethane, it is important to consider the key physical properties required for improved performance. This increases slippage and therefore the tear strength. 10 Best Silicone Roof Coatings Reviewed. REDUCE ENERGY COSTS. As I mentioned above, silicone is often used as a lubricant. While this odorous vapor is not harmful, it can be quite unpleasant for a buildings occupants. A good way to visualize this is to picture a tall tube with a piece of fabric stretched across the bottom end. Dont do it! What's more is that polyurea can cure in extreme conditions, including extreme cold, high humidity, and extreme heat? urethane, and thats what this section is about. Some designers combat this by using polyester instead of nylon but that approach has its own problems. Thermoset polyurethanes, in particular, can be chemically engineered into a solid or foam and portray a wide range of physical properties and surface finishes through either a cast molding or Reaction Injection Molding (RIM) process. Consumer Roof Coating Reports is comprised of several active and retired roofing professionals. Polyurethane Coatings vs. Silicone Coatings Both polyurethane and silicone are elastomeric roof coatings that are designed to stretch and contract with the movement of the roof. There are two types of polyurethane roof coatings: aromatic and aliphatic. (pronounced GRAYGE). Another issue is that because sil/sil fabrics can be quite slippery, some people dont like to use them in floors. After 20 years, the 30 mils of protective coating would naturally wear away to 7-8 mils. Polyether urethane is the other member of the polyurethane family that is used in outdoor applications. Instead, WPBs utilize a microporous membrane that blocks water droplets but theoretically allows water vapor to pass through. Thus, its a good roof coating for homeowners and business owners who want to reduce their carbon footprint. For professional use only. On day 1, your roof would get 1.5 inches of foam and 30 mils of coating to protect the roof. Different coatings have different properties that make them ideal for specific applications. FR chemicals can only be combined with PU and PE coatings, not silicone. In more arid climates, these particles collect on the surface of a silicone coated roof and darken it. The irony that the cause of the stench is PU is not lost on us. They make an excellent foundation coat for silicone roof coatings. Additionally, the PU component of this coating technique is still not immune to hydrolysis (discussed below), and will eventually break down. Water takes a long time to penetrate PU, which is why PU works as a waterproof coating. This is rarely an issue in terms of water actually penetrating into a tent, as the process is quite slow. After the fabric is dyed and finished, the fabric coater will apply one or more layers of coating (sometimes different coatings to each side of the fabric). In the case of fabrics with low slippage, adjacent yarns are not recruited to resist the stress, which then gets applied to only one yarn at a time. Home; . We are dedicated to bringing an awareness to the general public about the use of roof coatings and the scientific results of independent roof coating tests. Below, we highlight some key strengths and weaknesses of urethane coatings. 100% Silicone White Roof Coating Henry 887 Tropi-Cool 100% Silicone White Henry 887 Tropi-Cool 100% Silicone White Roof Coating is a premium, 100% silicone, moisture-cure coating designed to reflect the sun's heat and UV rays as well as protect many types of roofs. Occasionally, you may come across tents made with fabrics that are waterproof without the use of a coating.
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