Can Metal Roofing Be Installed Over Shingles?
Why Upgrade a Roof to Metal Panels?
Metal Panel Roof Restoration & Installation
Everything in Order: MBCI’s Online Ordering Assembly Feature
There’s no getting around it. Erecting any building involves thousands of parts. Different sizes, colors, lengths, types – you name it. Depending on the nature of the project, there could be numerous parts to be ordered and accounted for. Although MBCI simplifies the process, it can still be a lot to manage. Until now, everyone has come up with their own method – like the many long-timers who write it all out by hand. But for those newer to the process, it can be overwhelming. Now we’re taking the guesswork out of it and making the process considerably easier, with exciting new user-friendly features on our online ordering platform.
With the new addition of “Assemblies”, you can simply choose which area of a building you’re working on, fill in some details such as panel type, trim condition, attachment type, size, and color, and the system will do the rest of the work for you – making sure you have any necessary fasteners, accessories or other parts, adding everything to your order. No longer will you have to study construction drawings, noting fastener types and adding everything to your order by hand. No longer will you find yourself on-site without the needed materials. And, even if you do, the online ordering platform is available right from your phone to get whatever you need on the way ASAP.
As Director of Development Tyler Roose says, “We’ve heard testimonials from many, many customers and it’s the only way they like to order anymore. It’s a huge time saver.”
Ready to get started? Head to shop.mbci.com. If you are registered and an existing customer, you should have everything you need to log in. For new customers, simply fill in the requested information and provide your customer number to create an account. If you don’t have a customer number, reach out to your district sales manager or customer service rep.
Once you’re logged in, you’ll see the dashboard, which has links to any existing orders, quotes or other information you may need.
To get started on a new quote, simply click the “Start New Quote” button, which will give you an option to name your new quote and use a template if desired (more on that later).
Once you’ve begun a new quote, you will land on the Products page, where you have the option to shop by category, such as accessories, fasteners, panels, structural and trim. However, for this purpose, let’s focus on the newest option: Assemblies.
Choosing “Assemblies” will open a list of component types to choose from. For this example, we’re selecting PBR, but you’ll choose whichever is appropriate to your project. From the next list, select the area you’re working on, such as eaves, gutters, valleys, corners, bases, etc.
Once you’ve selected your assembly, the form will prompt you to choose details such as thickness, color, lineal footage of the assembly being used, and further options depending on the assembly and area you’re working on. Then, all the core trim items as well as necessary fasteners, sealants and accessories are automatically added to your material list for review. Notice the additional parts automatically added on the PBR form. If satisfied with your work, click “add to cart”, and a more formal review can now be completed once all parts from the project are accounted for.
Now you can simply repeat this process for whatever other areas you need. You can save and share this quote with others who may need to review and approve. If you anticipate needing similar orders in the future, choose the “Save as Quote Template” option in the dropdown box. The next time you have a similar project, choose this option when you start a new quote, then simply make whatever changes are necessary – colors, lengths, quantities, etc. – and you’ll be done with your order in much less time than with previous methods.
If for any reason you need to make changes to a quote, simply use the “Modify Quote” button at the bottom of the quote page.
Be sure to check out the other handy features on the online ordering site, such as related literature, documents and parts at the bottom of each product page and in catalogs. You can also search by keyword or use the navigation at the top for anything you might be looking for.
We hope you’ll take the time to learn the new system. It’s sure to save you innumerable hours in the long run. And if you get stuck or run into any problems, we’re here to help. Refer to the FAQ and don’t hesitate to get one of our sales individuals involved. We are all fully versed on online ordering and happy to help.
The Importance of Cleaning Metal Roof and Wall Panels
Metal panels need attention; they should not be taken for granted. True, they are a notably long-lasting and attractive choice, particularly with the myriad colors and protective finishes available, but once installed, proper care is imperative in order to maintain their durability, performance and good looks for decades.
What are the main culprits of potential damage? Dirt and residue (such as from trees or animals) left to sit on metal panels, for instance, can cause the irreversible degradation of protective coatings, thereby compromising the longevity of roof and/or wall systems. Additionally, corrosive elements, including bacteria, mold, mildew or even acid rain can damage the structural integrity of the panels. Additionally, buildup of foreign elements, such as leaves, can hide potential leak areas or places that may be rotting away. Even in terms of energy efficiency, keeping the panels clean may help a roof reflect heat as they were originally intended.
To keep panel appearance in top shape, protecting the finishes must be a priority—otherwise, you may find yourself needing to re-coat the panels. Stains from leaves and moisture, algae and lime deposits that remain on panels for extended periods can do serious harm to the finish. It should be noted, however, that re-coating should only be considered if the panels remain structurally sound and if doing so wouldn’t void the manufacturer warranty.
How often should you clean metal panels? Most experts agree that at a minimum, an annual cleaning is advisable in order to keep the panels free of common elements that can jeopardize the integrity of the finishes. If you have heavy tree overhang, you may need to clean it or remove debris a little more frequently.
Deep cleaning to remove more stubborn substances (e.g., tree sap, oxidation) can be done every 3 to 5 years, depending on the building conditions, location and weather, etc. Interim, moderate cleanings can also be performed following substantial weather events and seasonal allergen build-up. It’s a good idea, in fact, to assess roof conditions before winter hits to identify any potential issues that need to be addressed.
No matter the frequency, perhaps the most important advisory when it comes to cleaning the panels is to follow the panel manufacturer’s recommendations regarding who should perform the work and with what solutions and tools so as not to void any warranties. In some instances, it may be beneficial (or perhaps even required) to have a professional building surface cleaning company with metal panel experience do the work.
Tips on Proper Cleaning Techniques and Solutions
As for the maintenance and cleaning instructions, it’s always best to refer to the manufacturer’s guidelines in order to best protect specific products, for example, to determine which cleaning solutions and techniques work best for a given manufacturer’s panels. Neglect or improper care can degrade the finish, compromising not only the visual appearance and performance but, as noted, can also potentially void the panel warranty. But maintaining the panels doesn’t just entail washing them like you would a car; it also means keeping them free of harmful debris.
Here are a few general tips for the proper cleaning of metal panels (again, refer to the panel manufacturer’s specific directions):
Simple cleaning: generally, water and mild detergent will be sufficient. Do NOT use bleach, which can change the finish color or have a harmful interaction with certain finishes.
Water-soluble dirt or other deposits requiring more complete cleaning: you can use a solution of hot or cold water mixed with detergent. In a container of water, use a 5 percent solution of commonly used commercial (non-industrial, non-bleach) mild detergent. Use a cloth or a soft-bristle brush for application of the cleaning solution, followed by a clean water rinse. Alternatively, pressure-washing with a 40° tip is also an option.
Non-water-soluble deposits such as tar, grease, oil and adhesives: a solvent or alcohol-based cleaner may be required. In this case, since most organic solvents are flammable and/or toxic, they must be handled accordingly. Generally, keep them away from open flames, sparks and electrical motors; use adequate ventilation, protective clothing and goggles; and read the manufacturer’s Material Safety Data Sheet (MSDS) of any solvent used for any other specific safety details.
The following are among the cleaners widely recognized by manufacturers for this type of non-water-soluble cleaning: alcohols—denatured alcohol (ethanol) and isopropyl alcohol (rubbing alcohol); and solvents, including VM&P Naphtha, mineral spirits, kerosene, and turpentine (wood or gum spirits).
For any level of cleaning, do NOT use wire brushes, abrasives, or similar tools that will erode the surface coating and leave scratches or other finish damage that can lead to corrosion. Additionally, always test a small area before proceeding with any of the cleaning agents mentioned to ensure there is no adverse effect resulting from the product’s use.
Remember, the misuse or abuse of any of the acceptable cleaning agents will automatically void any manufacturer’s warranty for the affected surfaces, so be sure to check with the manufacturer and also follow directions on any cleaning products used.
By following the tips above, installers can keep metal panels looking great and performing well for years to come.
To learn more about the importance of cleaning metal panels, contact your MBCI representative or check out our blog post on metal panel maintenance.
Types of Standing Seam Metal Roof Clips & Why They’re Essential
A successful standing seam metal roof project goes beyond the obvious panels, substrate and frame. In order for the roof to look great and perform properly, don’t neglect the importance of selecting the proper roof clips for your given project. What may seem like a minor detail is, quite literally, what’s holding it all together. Here we’ll take a look at the key factors that go into selecting the correct clip type and see why this is so essential for the well-being of any standing seam metal roof.
When you are looking at the installation manual or if you’re ordering your materials directly—or even if you’re submitting the order to MBCI to do the engineering for you—you’re going to need to know and identify certain details. The roof clip selection criteria will be based predominantly on two main factors: 1. What is your insulation system and 2. What are the expansion and contraction requirements for your roof? You’ll also need to know your project’s roof geometry and how the panel you’ve selected is able to meet the roof clip range on a particular plane, because the distance the panel spans impacts what type of clip you would use. Additionally, the type of substrate you are attaching the clip to will dictate what type of clip you should use. Is it going over wood, metal decking, open framing?
With that information in hand, you’re ready to do your due diligence. MBCI classifies clips in two ways: high or low; fixed or floating.
The high and low clips are predominantly determined by insulation systems. For a low clip, for instance, MBCI will typically will go up to a maximum of four inches of insulation; a high clip will go up to six inches of insulation.
Here’s a bit of a caveat. What we’re referring to is how much insulation you’re trying to compress between the roof panel and the substrate—and particularly the purlins or the steel frame you’re attaching it to. The clips are designed with a “stand-off” that elevates the roof panel above the substrate to permit insulation to pass between the roof panel and the substrate at the structural attachment points. A low clip is typically a 3/8-inch stand-off; a high clip, depending on panel type, can be 1-inch, 1-3/8-inch or even possibly 2-inch.
Knowing this helps determine whether you’re choosing the right clip because, let’s say, you go with too tall of a clip or not tall enough to accommodate your insulation system, then the system’s going to be difficult to install and will not perform correctly. And watch out for roof systems that have roof clips with no stand-off that do not permit fiberglass insulation to be installed or is discouraged from being installed at the clip lines due to impact on the panel appearance.
Another factor here is if you are putting the roof over a solid substrate, such as wood or metal decking. In this case, we will typically default customers to a low clip system because they don’t need to accommodate for any sort of fiberglass insulation systems. We’re assuming the insulation is occurring elsewhere below the decking or incorporated with the decking, such as rigid board insulation. In the case of rigid board insulation over decking, a low clip is still utilized but with an added bearing plate. The clip is attached through the rigid board insulation into the decking or structure below.
The more particulars you know of your intended insulation system to determine the clip height needed, the better prepared you will be in determining the right clips. Will there be fiberglass insulation or rigid board insulation or no insulation? What is the insulation thickness? What type of insulation system? Share these details with your MBCI sales rep to help you get started selecting the right clip height.
You can also find much of this information on the MBCI website by searching the roof type and then reviewing the corresponding installation manual and details to determine what clip height to use based on your insulation and substrate.
Which brings us to the other main factor in selecting the right clip. A fixed or floating clip is dependent on the substrate and how much anticipated movement is needed for the roof size.
With fixed clip systems, there are no moving parts in the clip. The ability for that clip to expand and contract as the roof expands and contracts is dependent on the substrate. In layman’s terms, if you were to screw that clip to a purlin, as the purlin heats up and cools down, it’s going to allow for some of the movement of that roof. Generally, when a fixed clip is installed over a metal building purlin, the manufacturer advises a limit of 100-foot maximum on a single roof surface. This is an average and can be impacted also by roof color and geographic location of the roof install that control temperature swing ranges, i.e., 100-foot maximum is a guide.
It is advised that the fixed clip always be installed over open framing in order to permit the greatest ability to accommodate roof panel expansion/contraction. It is not advised to use fixed clips attached to a solid substructure because those don’t accommodate roof panel movement.
If the roof needs to be installed over a solid substrate OR if the roof plane is over a slope more than 100 feet, then the manufacturer would prescribe a floating clip system. [Note: A floating clip can also be used even if the slope is less than 100 feet.] The floating clip system permits the roof panel to move (expand/contract) independent of the substrate to which the clip is installed. The system either contains a clip with a tab seamed into the roof panel rib that is able to float/slide where it attaches to the clip, or the clip is such that when it engages the panel seam is doesn’t restrict the panel movement. The only thing controlling for floating clips is the maximum range of the clips that allows it to float. In other words, how far can the clip tab or panel slide at the clip attachment. The panel manufacturer again will have information as to this amount. You will need to make sure they’re aware of what the maximum single panel run distance is from low side to high side.
One more thing to note is that not every roof system is available with fixed clips and not all systems have high and low clips (although the majority do). That said, educating yourself and researching the panel you’re looking at will give you the information you need to make the determination as to which clip will not only work best, but potentially will work at all. Every panel has its own roof clips, so the roof clips are not interchangeable across all systems. An essential part of selecting a roof panel is verifying that its clip attachment is suitable for your project.
It might not be immediately obvious that you have the wrong clip. For instance, let’s say you ordered an Ultra-Dek® roof and you ordered an Ultra-Dek® clip. That sounds straightforward, but did you order the RIGHT Ultra-Dek® clip for your particular project? The roof may even be able to be installed regardless, but, after installation you may discover it doesn’t perform properly or as intended due to the wrong combination of clips, insulation and substrate. That’s why it is so critical to check with the manufacturer that you have the right clip before you purchase or start putting down the roof.
For more information, reach out to your local sales rep or go to the MBCI Ask An Expert site to confirm the clip you need to make your project a success.
Measuring for a Metal Roof: Considerations and Tips
Getting an accurate measurement for your metal roofing panels may seem like a no-brainer, but it’s not quite as simple as length x width. The many complexities of a roof must be taken into consideration in order to ensure your numbers add up. For instance, anything that intrudes upon a roof plane needs to be included in drawings with labeled measurements as these conditions will all affect the measurement but are sometimes overlooked.
Let’s look at some specific conditions to consider before getting out the measuring tape as well as some handy tips for installers.
Building Conditions to Consider Before Measuring
The type of roof system
Is it going to be a standing seam roof system or an exposed fastener system? Once you’ve decided on your roof type, we recommend reviewing all of the conditions/details on the roof. If it’s a standing seam roof, will the roof system need to float? If so, where will it be pinned, and what direction will it float?
At MBCI, we have published installation technical manuals for installers and erectors to utilize in order to familiarize themselves with how to adjust for ridge conditions or end lap conditions, for instance.
Is it a new or existing metal building?
If it is an existing building, are there new or updated building codes to consider? This could possibly dictate panel type, gauge, or width, or require additional framing members that could impact the final measurements.
What is the purlin spacing?
The panel break at the purlin for an endlap condition will need to be considered.
Are there extensions, overhangs or penetrations?
Include any roof extensions or overhangs that may not be apparent at first glance. Any and all roof conditions should be considered when calculating panel and trim length, including any roof penetrations such as pipes, roof curbs, skylight hatches, etc.
The manufacturer’s details will aid in determining such things as panel hold back at the ridge, or panel overhang at the eave or gutter. Also, roof or slope transitions, and panel hems should be considered.
The thickness of the insulation could determine or dictate the fastener type used.
- Field verify the roof slope. The contractor should gather the field dimensions so measure when the framing is in place. While you can measure off of a set of plans, it’s not a definitive way to do things because things change in the field.
- The structure should be square while you’re measuring. Scaling from plans may get you close, but measuring erected framing that is plumb and square is the most accurate.
- You should measure multiple spots.
- It’s a good idea to use a plan view of the roof or sketch a bird’s eye view to record your measurements.
- Record your measurements in the units of measure that your manufacturer uses, typically feet and inches, to avoid errors.
- The erector may elect to add a few inches to the length of the panels at a hip or valley to remedy any cutting mishaps since these panels will be field cut to the hip or valley angle.
- Some contractors include one or two extra panels at the longest length for any errors or jobsite damage.
Ultimately, the takeaway is that any differential when measuring metal panels for installation could affect a building’s performance, so it’s important to keep all potential scenarios that could affect measurement accuracy in mind—throughout the entire process. To find out more about the proper way to measure a roof for metal buildings or to schedule training, contact your local MBCI representative.
Tips for Selecting and Field Applying Touch-Up Paint
Metal roofing and wall panels routinely come from the factory pre-finished a durable, baked-on paint finish that covers the Galvalume®-coated steel surface. This production occurs in a controlled environment, which helps create a consistent product, and allows metal panels to last decades with minimal maintenance. It turns out, however, that the biggest threat to a metal panel’s paint coating can happen during panel installation. Tools, fasteners and other installation-related items and activities can scratch or damage the finish, requiring touch-ups to the paint. If you experience this, here are some touch-up paint tips to keep in mind.
Assess the Damage
First, determine how noticeable the scratch is. Do you have to be close to see it, or can you see it easily from several feet away? Generally, if the scratch isn’t noticeable and has not penetrated the Galvalume coating, its best to refrain from doing a paint touch-up. This is because touch-up paint can’t match the fade resistance of the original baked-on pre-finish, and if the Galvalume is still intact, it will still protect the steel beneath the scratch.
On dark or bright colors in particular, the touch-up paint will fade much more quickly than the original paint. Often, the end result is that touch-up paint is more noticeable than if the scratch is left alone. On the other hand, if the scratch is noticeable and needs a touch-up, there are some best practices to follow. It’s important to note though, that if a large area of the panel is damaged (more than 10–15%), then it’s best to just replace the panel.
Getting the right touch-up paint
Metal panel manufacturers recognize that there may be a need for minor paint touch-ups in the field. So, most offer small containers of paint conducive to field work. These paints are specifically formulated to match standard color offerings, and have properties that make them compatible with the factory finish. Therefore, it’s important to always buy touch-up paint from the manufacturer that produced the original panels. Never ask a paint store to match colors based on a piece of panel or trim. Doing so may get a color match, but it won’t contain the other protective properties of the paint coating you receive from a manufacturer.
Choice of touch-up paint application
Touch-up paint for field application is often available in three types of containers: paint pens, small bottles and spray cans. Usually, the best choice for a scratch is a paint pen. Touch-up paint pens have small, precise tips that can fit into scratches, allowing it to only apply paint where needed. For larger scratches or scuffs, manufacturers offer bottles of paint (with a small brush) similar to those used for nail polish. Generally, these are best for dings on the panel.
Spray cans are also available, and are ideal for painting small accessories like plumbing vent pipes. Don’t use spray cans to conceal a scratch because they apply much more paint than necessary. This can cause unsatisfactory results as the paint weathers and fades differently than the original paint.
Using touch-up paint
When performing a paint touch-up, it’s important to make sure the area in and around the scratch is clean and dry. Wipe down the area as needed, then dry it completely before applying any paint. Afterward, paint the surface using the least amount of paint necessary. This eliminates excess paint on the pre-finished panel. Paint pens are ideal for this since they apply less paint than a nail polish-type bottle or spray can. Once the touch-up paint is on the panel, it will need time to dry. During drying, make sure that dust or other contaminants do not embed into the wet paint.
Consult the metal panel manufacturer
To ensure you or your maintenance professional properly select and apply touch-up paint, be sure to check all warranty and installation requirements and resources with the metal panel manufacturer. They can help ensure you get touch-up paint that matches the paint originally used on your panels and that you take the right steps to ensure warranties remain intact. MBCI offers metal panel touch-up paint for industries and applications including:
- Commercial and Industrial
- Insulated Metal Panels
- Standing-Seam Metal Roofing
For more on metal roof and wall panel finishes, colors and touch-up paint techniques, contact your local MBCI representative.
Cutting Metal Panels Properly On Site
Cutting metal panels on site is an often-necessary part of installing metal roofing and wall panels. However, using the right tools and methods to ensure the panels remain damage-free is vital. Using the wrong tools can result in rust, rust stains, the voiding of warranties and diminished building service life. In this blog post, we’ll share several common field-cutting techniques and best practices that help ensure good results.
Maintaining Longevity When Cutting Metal Panels On Site
When metal panels are made in a manufacturing facility, the tools and methods used to cut the coated metal coil help protect the cut edge from deterioration like corrosion. When cutting metal panels on a jobsite or in the field, protecting any cut edges is just as important. To understand how to field-cut metal panels without sacrificing the quality and protection delivered from the manufacturing facility, you must first understand the what protects the panels. Most often, metal roof and wall panels are fabricated from Galvalume®-coated steel coil because of its proven longevity. Not only does the Galvalume coating protect the surface area of the metal panels, it has also been shown to be effective along the thin edges of the metal too, as long as those edges are cut properly.
During fabrication, the Galvalume metal panels are cut to length either by shearing while flat before entering the roll former, or by means of a profile shear as the panels exit the roll former. Either method tends to “wipe” the Galvalume coating across the cut edge of the metal panels. This provides superior cut-edge protection from corrosion.
Likewise, when panels arrive on site, any needed field cutting should address the same concerns of protecting the edge of the steel from corrosion. Of course, there are ways of doing the field cutting correctly. However, there are also poor strategies that can lead to real problems. The following are examples of common field cutting tools and the best practices for good results.
Common Tools and Methods for Cutting Metal Panels On Site:
Red and green aviation snips are a good choice for small cuts on metal panels, such as around pipe penetrations. These snips will wipe the Galvalume® coating in the same way as factory shears, making them a good choice.
Electric shears are optimal when making lengthier cuts along the steel, such as cutting a wall panel at a corner or at a door opening. These shears take a ¼” strip of metal out of the panel during the cutting process, which tends to leave both sides of the panel smooth and flat along the cut. Like the aviation snips and factory shears, electric shears will wipe the Galvalume coating and protect the edges.
Mechanical shears are an add-on tool that fit onto a battery-operated impact or screw gun. These shears do not take any metal out of the panel and will leave a slightly wavy edge. Mechanical shears are an excellent choice for bevel cutting standing-seam panels at hips and valleys, since they too wipe the Galvalume coating over the cut edges to offer protection.
A nibbler is a great tool for cutting across corrugations in wall panels to create openings for windows, doors and similar structural additions. A good nibbler typically costs $500-$700 (currently), but is well worth it if you often cut corrugated metal panels. The punch and die in the nibbler tends to wipe the Galvalume across the cut edge as it punches out small, half-moon shaped pieces of panel. However, because these little metal pieces will fall away from the cut, it’s important to contain them so no one walks on them. Otherwise, they can embed in the soles of installer’s shoes and create scratches in roof panels when they walk on the roof.
Skill saws are an ideal tool for cutting metal panels because of their versatility. This tool can cut either across or parallel to corrugations, whether straight or at an angle. When using a skill saw, it is critical to use a saw blade that cuts cool. Otherwise, the Galvalume coating can melt along the cut edge and become ineffective. In particular, do not use an abrasive blade, which will generate heat and damage the coating.
Additionally, its vital to avoid cutting panels on the roof or above other panels. A skill saw blade will throw considerable amounts of steel debris into the air and down onto any panels below. This debris, called swarf, will quickly rust and ultimately cause rust spots in the panels. If enough swarf gathers in one spot, it can rust through the panel.
Steel swarf, like this collected at the ridge will rust through the panel.
Which Tools Should To Avoid When Cutting Metal Panels On Site:
Tools that should never be used include:
- Cut-off saws
- Reciprocating saws
All of these tools will melt the Galvalume® coating, causing edge rust just like an abrasive blade would. These tools also throw a lot of steel debris (swarf) onto the panels they cut. This debris will be hot and will embed into the panel coating. This can cause rust spots and bigger problems down the road.
In conclusion, using the right tools and following metal panel manufacturer recommendations when cutting metal on site will help ensure that the panels remain damage-free and the final installation will be a fairly seamless process. Using the wrong tools can result in rust, rust stains, and the voiding of warranties. For more on best practices and recommendations for on-site cutting and installation of metal panels contact your local MBCI representative.