Felt paper based asphalt underlayments are heavy and possess extremely low tear strengths… not a roofing contractor friendly combination. Felt underlayments are further plagued by wind uplift blowoffs, as well as chronic buckling and wrinkling when wet. Felts are safety hazards due to staple pull through on steeper pitches, and are just plain bulky and messy to deal with. Very simply, felt paper is an outdated technology given the increased performance demands of modern day roofing, and roofing contractors alike.
At Scro’s Roofing Company we will be talking about the PALISADE Synthetic Roofing Underlayment in this BLOG because it is what we use most and really love the quality and durability of this product. Read about this roofing product below. You can visit the PALISADE website by clicking the hyper links here in this BLOG. All info. was taken from the PALISADE website.
PALISADE™ roofing underlayment is a laminated, woven, polyolefin-coated, sheet-type materials. The back face of the underlayment consists of a polyolefin coating extruded directly onto a woven scrim. The front face consists of a nonwoven layer with embedded dots that is laminated to the woven scrim. PALISADE™ underlayment is light blue in color and has raised dots on the front face. The underlayment has a nominal weight of 34.8 pounds per 1000 square feet. Roofing has traditionally been a messy business because of hot and oily asphalt handling. Traditional asphalt felt paper is black in color, and black surfaces result in high solar energy absorption (low reflectance), and consequently, high surface temperature elevation. These elevated temperatures cause several problems for felt underlayments, roofers and the roofing system:1. Asphalt felt paper contains oils that leach out at elevated temperatures. This can make felts slick and unsafe to walk on, and very hot and messy to work with. These oils also cause the roll layers to stick and become difficult to unwind. This is lost productivity in roll handling care, roll damage and repair, and extra time dealing with messy asphalt residue. The loss of oils over time due to heat also dries out and weakens asphalt felt paper underlayments.2. Elevated temperatures reduce the mechanical strength of asphalt felt paper, making nail tearing during surface walking that much easier, resulting in greater safety concerns. High temperatures from black color combined with solar UV exposure accelerates the degradation of asphalt felt paper underlayments. It is quite common for asphalt felt underlayment to last less than 10 years under 50 year rated tile roofing in the sunbelt.3. Black underlayments are solar heat sinks, thus increasing the energy absorption and heat-up of roofing systems, and ultimately, attic spaces. This increased heat load results in higher cooling bills for the home/property owner. California Energy Commission (CEC) Title 24 is a clear regulatory response to energy conservation by encouraging the use of “cool roofs”.Synthetic underlayments have eliminated the mess of dealing with oily asphalts, but most are black. The use of light color products (e.g. white & light gray) will reduce the heat buildup, but then are extremely shiny and reflective, resulting in extreme glare. Glare is also a significant hazard for roofers due to the blinding effects of some light color roofing products which can impair visual navigation on the roof, as well as making it difficult to align product, see chalk lines, fastener locations, and stray tools on the underlayment working surface, etc. PALISADE™ surface color was specifically engineered to reduce the effects of solar radiation absorption (heat up) and glare simultaneously. Utilizing KOOL BLUE™ technology, PALISADE™ was designed to produce a synthetic underlayment product that has both low solar energy absorption and low glare. But high reflectance can also mean high glare. The surface layer of PALISADE™ has been engineered with a unique low glare blue color and roughened microstructure which scatters the incident light, thus producing a diffuse reflectance, and low glare.
The principles of KOOL BLUE™ technology are visualized by a Solar Reflectance (SR) curve. The greater the % reflectance value, the lower the solar energy absorption and heat up. The figure below shows a SR curve for PALISADE™ and traditional black asphalt felt paper over the main visible spectrum wavelength range. As you can see, KOOL BLUE™ technology results in reflectance values of almost 50% in the visible spectrum compared to 5% for asphalt felt paper. This difference manifests itself during sun exposed underlayment conditions as a surface temperature rise of less than 10°F for PALISADE™ vs. 50°F for asphalt felt paper, and 8X cooler in terms of overall heat absorption!
STRONGHOLD™ skid resistant technology* represents a quantum leap in synthetic polymer roofing underlayment surface skid resistant technology. Roofing, and particularly steep slope roofing, is always a serious safety challenge. Any underlayment product that can help improve safety while working on steep slope roofs is of tremendous value to a roofer: safefy first and foremost. Traditional asphalt felt underlayments can become slip safety hazards when wet, or oily and slick on the surface when hot, or slip safety hazards from tearing away from staples due to the very low tear strength. Granular surfaced underlayments offer better traction, but very often the granules become dislodged, and this can result in serious slippage issues as granules act as ball bearings. Granular underlayments have a much heavier weight per square, and will score/scratch expensive metal roofing systems. There have been several attempts at improving the steep slope skid resistance of polymer based underlayment surfaces, but none achieves the level of performance of PALISADE™.Synthetic polymer film surfaced or nonwoven fiber layer surfaced underlayments aimed at reducing product weight and metal scoring are generally smooth or hard surfaced, but any smooth or hard surfaced surfaced synthetic polymer will become extremely slick when wet or dusty, regardless of coefficient of friction when dry. Without a strong mechanical interaction between underlayment surface and underside of footwear, water or dust will always result in a dramatic reduction in coefficient of friction; there is no mechanism to transfer the foot load past the water and dust interface layer and onto the underlayment. Dry skid resistance has little correlation to wet slip resistance. The real test for underlayment skid resistance is under more adverse surface conditions of dust and water. Utilizing advanced patent pending polymer processing technology, STRONGHOLD™ delivers the most advanced steep slope, 100% polymer based skid resistant technology on the marketplace today. A highly engineered raised surface profile pattern of soft and resilient rubberized polymer dots act as grip/anchor points underneath roofing footwear, allowing STRONGHOLD™ to deliver advanced steep slope skid resistance, especially in wet or dusty conditions.
Safety is the #1 priority in any roofing project. PALISADE is the best skid resistant surface synthetic roofing underlayment product in the marketplace today. At Scro’s Roofing Company we choose PALISADE™ with STRONGHOLD™ and KOOL BLUE™ technology.