KARNAK Launches New and Improved Website 

KARNAK Launches New and Improved Website 

KARNAK announced the launch of an updated website designed for an improved user experience. KARNAK, a manufacturer of reflective coatings, sealants and cements, notes that a key feature on the new site is a decision tree that helps visitors determine which product is right for them by walking them through a series of simple questions. The new design gives site users quick access to important information and resources including product installation videos and instructions and technical data.

Frequently asked questions are addressed as they relate to fabrics and reinforcements; damp proofing and waterproofing; and for general roofing scenarios. The Roof and Foundation Conditions page identifies common issues that are experienced on roofs and walls. The causes of the conditions are reviewed and the damage that can be created is described along with suggested maintenance and repair information provided for each condition. 

The new website is optimized for access from mobile devices with pages that rapidly load and navigation that is easy to use on a smartphone or tablet. Visitors to the site can also stay informed on the latest company activities and news by signing up for the new email newsletter. Visit the new site by clicking here.

Published at Wed, 06 Sep 2017 16:00:22 +0000

The details make the difference in wind design

The details make the difference in wind design

This is the first part in a series of blogs about designing low slope roofs for wind loads.

Roofing design encompasses many different factors. The assembly is dictated by the use of the building, the owner’s budget, the building’s location, local building codes, energy codes, and the forces of nature that are regularly, as well as occasionally unleashed upon it. In addition, a change in one part of the building envelope can adversely affect something else. As this implies, there are often many choices that the designer has to make. It is important to note that the installer also has a great effect upon the overall performance of the system. Communication between the designer and the installer is paramount to the success of the system. The designer needs to relay exactly what components should comprise the assembly, as well as how the system should be installed. Conversely, the installer should alert the designer of any conditions or potential changes that do not match the plans and specification, since a small change can affect the entire envelope.

Communication between the designer and the installer is paramount to the success of the system.

Let’s talk about golf for a moment. A 300 yard drive has exactly the same value on the score card as a 6 inch putt. The same is true on the roof. If the installer omits sealant and a clamp on a pipe flashing detail because the incorrect one was displayed in the plans, it has the same result as a cold-welded seam: Water in the building. So nearly every detail, no matter how small, can have the same effect. One such mishap may be small, but like strokes on the scorecard, they all add up.

There are certain details that often get overlooked. Sometimes specifications and plans don’t match. If that happens, which one prevails? Sometimes plans trump details, others the opposite is true. Very often, perhaps in the interest of conserving time or effort, a specification or plan detail will state to comply with an established standard, such as those published by FM (Factory Mutual, which does its own system testing for its member insurance companies), SMACNA (Sheet Metal and Air Conditioning Contractors National Association), or the International Plumbing Code without specifying which exact detail or practice. One very common mistake, for example, is specifying FM 1-105 on an OSB deck, but FM doesn’t test over combustible decks. So according to FM, a system over an OSB deck wouldn’t be rated to withstand 105 pounds per square foot, or PSF, of uplift pressure. Perhaps, in that case, it would be better to outline specific enhanced fastening patterns or fastener pull out values.

Sometimes specifications and plans don’t match. If that happens, which one prevails?

The designer of record can possibly open themselves up to liability if they leave details up to the installer’s interpretation. Quite often, trades will mix and match responsibility of interfacing details, such as components of drains, counterflashing roof edge termination, coping cap waterproofing, and HVAC transitions to name a few. Returning to the situation where FM 1-105 over an OSB deck has been specified, the designer should ideally have consulted with the membrane manufacturer to identify options that have been demonstrated to conform to established standards. Good and experienced suppliers do a lot of system testing to understand how to achieve required levels of performance with as many options as feasible.

Wind Uplift – The Basics

Wind Pressure

Wind uplift, in general, is the upward force pulling on the building components as a result of wind blowing around and over the building. The roof is naturally exposed to these forces due to its location. When the wind flow moves over the edge of the roof it creates negative pressure. In addition, positive pressure exerted from inside the building from HVAC and openings such as doors and windows can also contribute to these forces, depending upon the building’s construction.

Edges are Critical

Roof Field

Corners and perimeter zones are especially vulnerable to wind uplift forces due to their proximity to the edge. Vortices are created at corners, which can increase the upward pull. The next illustration is a top view of the roof, identifying perimeter and corner zones. As a rule of thumb, attachment (uplift resistance) is enhanced at a rate of 1.5x at the perimeter and 2x in the corner to combat these forces. Roof edge termination is especially critical, since it is at the leading edge holding the roof to the structure.

This fully adhered TPO roof was peeled back from the edge during a wind event, separating insulation layers.

This fully adhered TPO roof was peeled back from the edge during a wind event, separating insulation layers.

Roof edge termination is instrumental in resilience to these forces. Remember the golf analogy? Well, nearly every detail counts the same on the score card. Imagine this: You are on the 8th tee just starting your backswing when a meteor the size of a 1966 Volkswagen Beetle crashes in the middle of the fairway leaving a huge smoking crater. This is not simply a stroke, but instead, it is a catastrophic ending to the game (and quite a story). The same is true with the roof edge. A few years ago, the National Roofing Contractors Association, NRCA, independently tested numerous roof edge terminations. Mark Graham, the Vice President of Technical Services for the NRCA stated in an article featured in Professional Roofing magazine, “…flexural failure during edge metal testing is much more common than fastener pull-out…” The act of just adding more fasteners will not suffice, because if the metal is an insufficient gauge for the application, it will flex, allowing wind to lift it. It is reasonable to assume that when the edge catches air, the rest of the system is likely to follow like dominoes.

Roof edge termination is especially critical, since it is at the leading edge holding the roof to the structure.

Attention to Detail

So, if edges are critical, what is to be done? Ideally two things are recommended; first, instead of a general reference to compliance with SMACNA standards, it would be prudent to call out the exact detail that should be applied in specific locations. Second, the specifier may want to designate which trade is the best to be responsible for each detail, as opposed to leaving the decision up to the trades to decide what to include or exclude within their respective scopes. If a SMACNA detail is to be applied, then perhaps a sheet metal contractor may be the better choice to be responsible for that scope.


TP-3 Courtesy of NRCA Guidelines for Single-ply Membrane Roof Systems

Take a moment to look at one common example from the NRCA, which is generally understood to be considered “good roofing practice.” Shown above is Detail TP-3 from the NRCA Guidelines for Single-ply Membrane Roof Systems.

The field membrane extends over the roof edge, and down the wood nailer, and is secured by the fastening of the anchoring cleat on the face. The thermoplastic (TPO or PVC) coated metal is then placed on top of the membrane and fastened based upon the Architectural Metal Flashing Securement options found within the NRCA Roofing manual. That detail is completed with a hot air welded flashing strip that ties the roof membrane to the Thermoplastic coated metal for a watertight assembly. That is a roofing detail to be installed by a roofer.

Imagine for a moment that the owner wanted to save some money; would you, as the designer, decide to do it here?

Keep in mind that even though the assembly may qualify for a standard warranty, the owner is still exposed to the inconvenience of dealing with replacement, as well as collateral damage such as lost wages due to clean up, lost merchandise due to damage, and lost use of space while waiting for repair. There are other ways for a designer to save money on the assembly that do not significantly increase the risk of the roof blowing off. Remember the meteor?

The diagram on the right is from ANSI/SPRI/FM 4435/ ES-1-11. Picture2This document establishes standards for roof edge details as they relate to wind uplift resistance based upon actual testing from collaboration with ANSI (American National Standards Institute), SPRI (Single Ply Roofing Industry), and FM (Factory Mutual). It illustrates one of the methods of testing the edge termination. This demonstrates a mechanically attached system with the same detail as above (NRCA TP-3). A load is applied to the field membrane at a 25 degree angle from the deck to simulate the stresses of the field sheet billowing.

How would the less expensive alternate detail fare in this test?

…even though the assembly may qualify for a standard warranty, the owner is still exposed to the inconvenience of dealing with replacement…

The table below is from ANSI/SPRI/FM 4435/ ES-1-11:

ANSI chart

Courtesy of ANSI/SPRI/FM 4435/ES-1-11

Pay special attention to a few things; first it shows the recommended minimum gauge for each metal (a thicker gauge can be specified for added strength), second it is based upon the width of the exposed metal, so the wider it is, the thicker it should be. ES-1-11 outlines design criteria for wind uplift for edge details. This document is created as a guide to keep roofs where they belong.

Wrapping it Up

The designer of record, whether an Architect or a Consultant, should be decisive, and choose specific appropriate details. The owner is looking for a roof that is resilient, cost effective, and does not cause any problems. Keep ANSI/SPRI/FM 4435/ ES-1-11 close, and don’t risk your reputation in the hands of the lowest bidder. Ask any golf pro and they will tell you that putting is 40% of your game, so you had better make it 40% of your practice.

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Published at Wed, 23 Aug 2017 17:27:26 +0000

Property Drone Consortium Welcomes Texas Windstorm Insurance Association

Property Drone Consortium Welcomes Texas Windstorm Insurance Association

COLUMBIA, S.C. – The Property Drone Consortium (PDC), a collaboration that consists of insurance carriers, roofing industry leaders and supporting enterprises recently announced that Texas Windstorm Insurance Association (TWIA) has joined the consortium as a technology member. 

“We are pleased that TWIA has decided to become a member of the consortium,” said PDC President Charles Mondello.  “Their decision to join demonstrates their commitment to being a forward-thinking carrier that realizes the impact that the use of drones will make on property inspections.”

TWIA General Manager John Polak stated, “TWIA understands the importance of implementing new technologies and procedures to more efficiently serve our customer base. The ability to use drones in the inspection and evaluation of properties both before and after catastrophic events is of utmost importance to us.”

TWIA is a residual insurer of last resort that was established by the Texas Legislature in 1971 following Hurricane Celia in August of 1970. The company provides essential insurance coverage to residential and commercial properties along designated portions of the Texas seacoast territory.

For more information, visit www.propertydrone.org.

Published at Wed, 06 Sep 2017 12:00:00 +0000

NRCA continues to push for reform of career and technical education federal policies

NRCA continues to push for reform of career and technical education federal policies

Professional Roofing’s August issue highlights NRCA’s continued efforts to reform career and technical education federal policies.

Roof Repair and Maintenance (5)In June, the U.S. House of Representatives approved the Strengthening Career and Technical Education for the 21st Century Act (H.R. 2353), legislation that would reform and reauthorize CTE programs operated under the Carl D. Perkins Career and Technical Education Act of 2006.

NRCA’s efforts to work with Congress to improve policy governing career and technical education (CTE) are highlighted in “Educating for the 21st Century,” an article published in Professional Roofing’s August issue.

The article states NRCA believes more effective CTE programs are vital to the long-term prosperity of the roofing industry. It is becoming increasingly difficult for contractors, manufacturers, distributors and other industry employers to find enough workers to fill job openings despite vigorous efforts to recruit new employees.

NRCA is urging Congress to improve and expand CTE programs to help meet the growing need for skilled applicants for well-paying roofing jobs. NRCA member companies provide career opportunities for those with the proper skills and work ethic. Reformed and expanded CTE programs can help provide students with the skills needed to pursue rewarding careers in the roofing industry.

In 2015, Congress began developing legislation to reauthorize the Carl D. Perkins Career and Technical Education Act, which authorizes and provides more than $1 billion in funding for CTE programs at secondary and post-secondary levels. Policies governing these programs have not been updated since 2006, and their effectiveness for meeting the current needs of employers is in question.

NRCA has worked with lawmakers to develop policies designed to improve and expand CTE opportunities to meet the challenging workforce development needs of our members. The goal is to provide new opportunities for employers to collaborate with educators at the state and local levels to develop CTE programs designed to achieve employers’ workforce objectives.

According the article, a reauthorized Perkins Act will provide maximum flexibility in the design of CTE programs to ensure they are truly effective for meeting rapidly changing economic demands. In addition, there is a need for expanded employer-sponsored internships, on-the-job training opportunities, new sector partnerships between employer and educational institutions, and more incentives for the development of industry recognized credentials.

In 2016, a bipartisan group of lawmakers led by Rep. Glenn Thompson (R-Pa.) introduced the first iteration of H.R. 2353 which included policy recommendations developed by NRCA and allied groups. After passing the House, the Senate failed to take action on the legislation before adjourning at the end of 2016.

In 2017, at NRCA’s urging, the House renewed its efforts, and a revised bill was approved with strong bipartisan support in June. However, bipartisan differences in the Senate over education policy present an obstacle to Senate passage.

It is critical all NRCA members support this effort by contacting their senators in support of the bill. NRCA recognizes the importance of workforce development to its members and will continue working with lawmakers to pass the legislation. When implemented in the coming years, programs developed under the reforms in H.R. 2353 could be critical to enabling roofing industry employers to meet their workforce needs.

To read this article in its entirety visit http://www.professionalroofing.net/Articles/Education-for-the-21st-century–08-01-2017/4065/.


Published at Wed, 06 Sep 2017 15:33:44 +0000

Peace of Mind: Lyons Roofing

Peace of Mind: Lyons Roofing

If there’s one unwavering lesson that roofing contractors learn along their business journey it’s that roofing is an industry that’s permanent, meaning, once you’re in — you’re all in. Even before his career in roofing began, Paul LaNue was no stranger to this mindset, having gathered with friends for weekly poker games. Paul’s friends, all of whom were already employed in the roofing industry, played a hand in convincing him to take the plunge and join them in the trade. It was 1997, and their timing couldn’t have been better since Paul had recently closed his carpet cleaning company. That coincidence marked just the beginning of Paul’s prosperous two-decade career in roofing.

After working in the industry for 14 years, Paul was recruited by the owner of a company who believed he was the right man to help grow his business.

Published at Wed, 06 Sep 2017 12:00:00 +0000