Category Archives: Architects

Architects’ Notes: The Differences Between Galvalume And Galvanized In Metal Roofing Projects

Englert’s nationwide team of architectural sales reps spend a considerable amount of time each year counseling architects on which standing seam metal roofing products and profiles might work best for their design projects.  One of the questions most frequently asked by architects is: What are the differences between  Galvalume and Galvanized Steel when used in roofing. It comes up so often, we thought we’d take a few minutes and use this week’s blog to explain those differences.

First, a little bit of background. Galvalume® was invented by Bethlehem Steel in 1972. It is a trademarked name, but many people use it as a generic term to describe a metal roofing product consisting of  steel coil coated with a metal alloy. That alloy is 45% zinc and 55% aluminum and looks similar to galvanized steel, but the visible crystals are smaller and close together, giving it a smoother appearance.  Galvalume has a cousin, Galvalume Plus. The only difference is Plus has a thin, clear acrylic coating. Because Galvalume Plus can be roll-formed dry without vanishing oil, it is very easy to form and install safely.Galvalume metal roof peak with snow guards.

The combination of zinc and aluminum in Galvalume enhances both the positive and negative effects of aluminum.  Galvalume has barrier corrosion resistance and heat resistance similar to aluminized material and good bare edge galvanic protection and forming qualities like galvanized material. Consequently, Galvalume  and Galvalume Plus will resist rust, the elements and fire while providing a sturdy and protective covering.

Galvalume® is more corrosion-resistant than galvanized steel, but because aluminum provides barrier protection instead of galvanic protection, scratches and cut edges are less protected.  Galvalume is offered in both bare and pre-coated versions. Most Galvalume®–like galvanized steel– is coated. But Galvalume has an excellent performance life in bare exposures as well.  Both galvanized steel and Galvalume® weigh 100 to 150 pounds per 100 square feet and contain about 35% recycled materials. The cost of Galvalume and Galvalume Plus are about the same as that of galvanized steel. Continue reading

Metal and Coatings Are Important: But the Paintline and the People Who Run It Will Make the Difference

Everyone always talks about the quality of their aluminum and steel in metal construction and the importance of using a high end coating.

But very rarely do you hear anyone talk about a third key element in the manufacture of a quality metal roofing or wall product—the paint line on which it is made. Virtually every aspect of a paint line plays a critical role in the final quality of the product. Following is a quick visit to a modern paint line with a look at why a state of the art manufacturing operation is critical to the production of a superior product and to the economies of cost in producing it.

Paint line systems built within the past few years are environmentally superior. They capture 100 percent of solvent fumes from painting, drying and curing operations and recover virtually all of the heat from the burning solvent for return to the process in an ultra-clean system.Metal coil paintline.

Newer paint lines have systems  that can heat their ovens and metal cleaning and pretreatment operations with no cost, saving  a substantial amount of energy which otherwise would have to be built into the cost of the product. Their environmental systems burners destroy volatile organic compounds (VOCs) and solvents in their incinerator. The heat from there is passed through for heating ovens and the boiler which creates steam heat for the cleaner and rinse tanks. Then fresh air from the coater rooms is passed through the heat exchanger and into the incinerator to be burned to complete the loop. Any excess heat is then pumped out through the stack.

Modern paint lines have an oven and incinerator with one burner along the entire line, producing the highest grade of painted metal possible. Oven heat in these modern systems is better balanced internally to give a better product with color that is uniform across the entire roll. Samples of whites produced in older, multiple-burner manufacturing systems can have a yellow cast across the width of the strip because the heat is stronger on one side of the burner than the other. The new systems set the highest standard in the industry for quality, color and consistency. Continue reading

Metal Roofing Contractors Can Avoid Cinching AKA Friction Scratches With These Simple Rollforming Tips

Cinching, sometimes also referred to as “friction scratches” or “pickoff,” is the result of the movement or slipping of painted coil laps against each other on a rollforming machine.

This phenomenon can be frustrating to metal roofing contractors because it causes the removal of paint in the shape of small or medium sized scratches on metal roofing coil formed in the same direction of the slipping or movement of the coil laps.

Some clear signs that cinching is the cause of these short longitudinal scratches are:
•    Worn or broken pieces on the spools, idler rolls and guides,
•    Gaps or air spaces between sections of the laps of the coil
•    The ability to move the laps of coil with hand pressure, a sure sign that coil has unraveled.

Cinched metal roofing panel.The vast majority of cinching incidents are caused by improper brake pressure on the un-coiler spool or the expandable arbor brake on the rollforming machine.  For portable roll formers, the improper brake pressure on the un-coiler spool is by far the source of most cinching. And new machine operators not familiar with the use of the brake or trained incorrectly are responsible for most of the problems.

To avoid cinching, the rollforming machine operator must make sure there is proper tension to allow the coil to uncoil without tightening the laps or without loosening the coil so it does not unravel. If either of these actions occurs, the laps will rub against each other and cause cinching. Continue reading

Standing Seam Metal Roofs: Always Look On The Bright Side of Life

Quick! What color is the standing seam metal roof on a Home Depot? Barnes & Noble? How about a Lowes Home Improvement store?

We’ll bet you knew all three of them-orange, green and blue. And not any orange, green and blue because each of those retail giants has a custom name for its colors. They know their colors play a key role along with signage to brand their companies and ultimately help customers identify and remember their stores in the great clutter of America’s malls and roadside retailers.Metal roof on IHOP restaurant.

They are not alone. Scores of fast food chains, national and regional gas stations, hotel chains and the like have signature color standing seam metal roofs that serve as beacons to customers. The color in essence becomes part of their brand.

Why? Because color possesses an inherent ability to stimulate an aesthetic consciousness simply by the visual satisfaction that it creates. Used intelligently, color and colored light can add distinctiveness and appeal to any project. Continue reading

Hurricanes and Mega-storms in the Northeast: Is it time to take a new look at the building codes?

Hurricane Sandy was the ninth such devastating storm to hit the Northeast in the last five years, and it raises the question “Will the impacts of climate change only make such storms worse.”

That region has had hurricanes and Halloween snowstorms.  So the questions must be raised–Are these coincidence or is climate disruption affecting this region and other parts of the country? And what do government, the insurance industry and private sector developers have to do to protect against future devastation?Sea Girt NJ During Hurricane Sandy

More than a decade ago in the wake of destruction of Hurricane Andrew, Southeastern elected officials, state, county and municipal engineers,  building department officials and the insurance industry finally bit the bullet and imposed stringent building requirements to thwart the impact of future storms.  The Florida Building Department and Miami-Dade County launched stringent building codes to ensure new construction could survive the high winds bred by hurricanes and tropical storms.  Other states and their counties and municipalities throughout the region began adopting the provisions of those codes as well. The result has been a significant reduction in damage in high wind situations. Continue reading

Hurricane Sandy Message

Here at Englert, our hearts go out to the victims of Hurricane Sandy who have lost so much and face the challenge of putting their lives and their communities back together.

As many of you may know, our corporate home and the home of many of our employees is Perth Amboy, New Jersey. Since the storm hit, I have spoken with many of our employees living and working here and am particularly proud of those who have volunteered to help in the recovery in their own communities.

I am also extremely proud of the staffs at our field service centers who are making sure the normal flow of business is maintained and that we have abundant inventory to satisfy customer needs throughout the country in the weeks ahead.

The people of our region are tough. They will rebuild their communities; they will make them better than ever. And we at Englert will be there to help them.

Now is the Perfect Time to Replace an Aging Flat Roof with a Retrofit Standing Seam Metal Roof System

Aging building stock and demands for energy efficient buildings makes now the perfect time to suggest a retrofit standing seam metal roof.

A sloped retrofit metal roof system incrementally extends the life expectancy of a building, reducing roof maintenance costs. It also improves its aesthetic and economic value and may even decrease insurance premiums inflated by past problems.Flat roof being retrofitted with metal roofing.

According to recent studies, about 25% of U.S. commercial, institutional and public buildings are now 55 years old or older. Right now, there is roughly 71.6 billion square feet of aging commercial buildings in America. With another 10.6 billion square feet in industrial space and more than six billion in pre-1980 school construction you’ve got more than 24 percent of all structures in the U.S. ready for renovation. In a tough economy, the need to refurbish and give new life to these buildings should be an architect’s dream.

Installing a standing seam retrofit metal roof system will eliminate the disruptive loss of business and building use that occurs if you replace the old roof with another flat roof. Continue reading

Sorting out the Necessary Test Requirements for Metal Roofing Projects

We know that the metal roofing tests and standards an architect must include in a project specification can sometimes be confusing.

For example, we see  some architects—and particularly designers new to the profession — specifying  ASTM E 1592  for a plywood or B-Deck and B-Deck with ISO when, in fact, 1592 is the test method for structural performance of a metal roof for open framing such as a purlin application.
Image showing fire testing of a metal roofing surface.
Often, we’ll see architects using a Factory Mutual test specification for fire resistance when first, an FM designation is really only for projects to be underwritten by Factory Mutual (FM) Insurance and second, the FM specification is far more stringent than the project requires and consequently will be a lot more expensive for the builder to meet.  Besides, Factory Mutual offers RoofNav, a simplified and very specific means of determining a roofing product’s and roof system’s compliance with FM Approvals’ guidelines and standards.

Some architects even submit metal roof specifications with information drawn word-for-word from the specs of an earlier metal roofing project that had similar requirements—but was not exactly the same.  This is a bad idea because the specification information often differs dramatically even though the projects seem similar.

How can architects and builders avoid these problems? Two ways…. Continue reading

Got A Metal Roof —Time to Think About Snow Guards… And Not Just For the Snow

Winter is just around the corner and in locations that see heavy snow; metal roofing has always been the choice of homeowners for years.  Its smooth coated surface sheds snow faster than other kinds of roofing materials, inhibiting snow buildup and protecting the structural integrity of the roof.

If you are designing in areas with heavy snow accumulation, then you’ll also probably want to think about the use of snow guards and snow rails to control the shedding of snow from the roof.

Snow guards on curved metal roof.There are plenty of different kinds of snow guards and rails out there designed for use with standing seam metal roofing products.  The most effective seems to be the systems that are mechanically attached with brass or aluminum clamps using round-point setscrews that will not “pin” or “fix” the metal roof panels to the building.

Snow guards can even enhance the aesthetic appearance of the building, offering  colors and finishes matching standing seam metal roofing panels and coated to last as long as the roof itself.

If you are considering a snow retention system on your metal roof then get one designed and engineered on a site-specific basis. They’re made for your roof and they will also carry a performance guarantee.

Mechanically attached snow guards are about six times stronger than adhesively-mounted devices that can degrade with time and exposure.  In addition mechanically attached guards require less time and labor expenses than soldered snow guards.

And just when you thought snow guards were just for snow, we’ve found some enterprising architects who have found some interesting uses for these kinds of guards and rails not even remotely associated with snow! Continue reading

Metal Roof Coatings: What to Look for When Choosing a Durable Topcoat

When architects and building owners are looking for specific performance characteristics in choosing a metal roof, they are inevitably looking for its coating to act as a continuous barrier, adhere tightly to the substrate, and not fade, peel or chip over its life. They expect it to be hard enough to resist incidental scratches from transportation, installation, and roof traffic and impact. They do not expect it to be so brittle as to crack during metal forming. They want it to resist damage from atmospheric chemicals and salt and not chalk, fade, lose gloss, or stain. In other words, they want the coating system to be durable, enhancing the life of the metal roof underneath and extending the guarantee that the product will perform effectively for many years.

There are dozens of tests that paints can undergo to determine their performance characteristics for durability (See National Coil Coating Association Tool Kit #8). There are falling sand erosion tests, acid tests, adhesion after impact and bending tests and acid rain and salt spray simulations.  Fade, chalk and gloss are the most important characteristics measured in weathering tests.

Paints are usually identified by a resin type such as polyester, urethane, latex, etc. Tradeoffs in creating these systems are made to meet different price points for different needs. But, paints should also be considered as complete systems, rather than as a simple addition of a better or cheaper part of the product.Metal roof coating colors

Let’s dig a little bit more deeply to see what makes the difference in a superior metal roof coating. There are several coil coating topcoats available but only three are used primarily for coil coating exterior metal like that which is found on a standing seam metal roof system. Polyesters have traditionally occupied the low end of the market. They offer a hard, scratch-resistant finish and a wide range of gloss. But polyesters are prone to chalking when exposed to UV or sunlight. Since their introduction in the 1960’s, polyesters have been greatly improved with higher molecular weights and longer polymeric chains that create stronger, more UV-resistant bonds.

Silicone-modified polyesters (SMP), also known as silicone-protected and siliconized polyesters, use polymerized silicone to improve polyester chalk performance and gloss retention. But one disadvantage of silicone polyesters is lower flexibility due to the highly crosslinked and branched structure of these polymers. Continue reading

Free Englert Roofing Mobile App Download:

Easy access to all Englert brochures and catalogs, a color selector for both roofing and gutter colors, standing seam metal roof panel profiles, and a convenient coil calculator to assist in estimating and completing your particular project.

Copyright 2018 - Englert Inc. - All rights reserved - Designed and Developed - Sitemap - Terms & Privacy