Are you a homeowner with a metal roof?
A standing seam metal roof is a roofing system that can be managed by an industrial or commercial property. The United States has a large number of metal roofs. There is a good chance that you have seen a metal roof on a building you own.
Most likely, you’ve had to deal with leaky metal roofs if you were responsible for a metal roofing system. These metal roofs are very unique in terms of the details. The repair options available are also unique.
Many buildings can use metal roofs. They are often used for residential roofs that have steep slopes. They can also be installed on industrial and commercial buildings. Metal roofs are used in industrial buildings as both the waterproofing system and the structural roof deck.
Are you experiencing roof leaks from your metal roof?
You are not the only one who has a metal roof. Leakage can occur in certain areas of metal roofs.
The devil is in details, as the old saying goes. This is truer than when it comes to the maintenance and installation of metal roofs.
Here are some common issues with metal roofs:
Open seams
Open penetration flashings
Oxidation of metal roofs
Backout Fastener
Flashing open ridge/headwall
You can counterflash with looser measures
Improper installation methods
Panel damage
Before we get into the places where metal roof leaks can occur, let’s take a look at some of the main design characteristics of a steel roof system.
Structural vs. Architectural Metal Roof Systems
You can install metal roofs as either an architectural or structural metal roof assembly. The main difference is the use of a structure roof deck.
A separate structural roof deck is used to install an architectural metal roofing system. These systems are available for most residential applications. These systems can also be found in commercial buildings, such as shopping malls, where there is a separate deck to support the metal roof panels. This type of metal roof system design has a distinct structural deck that supports the metal panel.
The structural metal roofing system sounds just like it does. This design uses metal roof panels to serve as both the structural deck and waterproofing system. These metal roof systems can be found on pre-engineered, metal buildings. These metal roofs are attached using clips to attach the panels and horizontal purlins. The purlins are usually covered with batten insulation before the panels are installed.
Hydrostatic vs. hydrokinetic designs
The slope is an additional design feature of a metal roofing system. Metal roofs can be installed on either a steep or low slope. Metal roof systems can have major problems if the slope is not considered.
When designing, installing, and maintaining a metal roofing system, it is important to consider its slope. A low-sloped roof system is defined by the NRCA ( www.nrca.net). This refers to any roof that has a slope of less than 3:12. All other roofs are considered steep-sloped.
Hydrostatic metal roofing systems are made to retain water until it drains. These roofs can hold water for up to a year without leaking. These metal roofs are typically found on larger, pre-engineered metal buildings. With a steeply sloped roof, larger structures can be more expensive to design. Residential applications can also benefit from additional hydrostatic metal roofing systems. You can install copper and tin metal roofs with flat seams soldered in a hydrostatic system.
Hydrokinetic metal roofs are made to shed water. These systems can be used on steep slopes. These systems are suitable for steep sloped commercial and residential applications. Hydrostatic pressure can be created by water retaining on the roof, which forces water into the details and causes metal roof leaks.
Metal Roof Leaks…The Devil Is in the Details
Major problems can be caused by mistakes in the design or installation of a metal roof. Problems are often not caused by system selection. Most metal roof leaks can be attributed to details that were not properly finished. These errors are not always obvious after installation. These mistakes may take some time to become apparent.
These are the five most common problems that can be found during an assessment of a metal roof’s condition.
Horizontal Seams Openings
It can be difficult, and sometimes impossible, to create metal roof panels that extend beyond the rafter lengths of a building. The length of the panels can be limited by the project designer based on expansion or contraction.
Because of the restrictions on panel length, the roof installer must install horizontal seams. These horizontal seams are perpendicular with the metal roof’s standing seams.
Horizontal seams can separate over time. This can lead to water entering the building through an opening in hydrostatic metal roof systems.
Opportunities in Penetration Flashing
Metal roofs are susceptible to expansion and contract. This happens because the metal panels move due to temperature changes. This causes stress at points of attachment and at penetrations into the roof system. Roof leaks can result from the stress at the penetrations and flashings breaking down.
Metal roofs are made by joining individual metal panels at the seams. It is very difficult to take down and disassemble metal roofs once they have been installed.
They are not able to disassemble like an asphalt shingle system and can only be repaired by the penetration flashing. It is more difficult to make long-term repairs, especially if the penetration is done after the metal roof has been installed.
Oxidation of Metal Roofs
There are many materials that can be used to make metal roofs. You can choose from steel, aluminum or tin. Some of these materials can be oxidized. Metal roof panels are usually made of sheet metal coated with a protective coating. This protective coating can wear down over time, causing metal panels to oxidize.
Problems can be caused by surface oxidation. If the metal roof is a structural system, these problems could lead to structural failure. Repairs can also be hampered by oxidation. Sealant application can be made more difficult by metal panel oxidation at fastener heads.
Fasteners that Back Out
Metal roofs typically have a mix of concealed and exposed fasteners. These fasteners may be either screws or nails. Exposure fasteners are usually covered with a neoprene washer, which seals the fastener head to a metal roof panel.
Overtime fasteners can have a tendency not to recline in their seated positions. There are many reasons this can happen. Wind uplift can cause fasteners to come out. Metal panels can vibrate in wind conditions, causing fasteners to lose their grip. Fasteners can also be damaged by freeze-thaw. Water can get in when the neoprene washer is dry. Winter conditions can cause water to freeze and expand, resulting in the fastener being re-enterprise.
Open Ridge/Headwall Flashing
Roof systems must be able to connect with other surfaces. This includes rising wall details, where the roof system matches other surfaces. This could be an example: A metal roof system that ends in a rising wall under a sign band at a shopping center.
This is a common area of weakness. It is often due to poor installation. These details need closure strips to stop water from getting back into the detail. Contractors might forgo installing this closure strip. The underlayment protects the roof against blow-back at first. As the underlayment ages, moisture can seep into the roof system.
There are many other potential sources for metal roof leaks. These are five common leaks that can be detected early. The first step in identifying potential leaks is knowing where to look.
Let’s now look at the various options and solutions for metal roof repair in clark county.
Metal Roof Repair and Replacement Options: Restoration versus Replacement
When it comes to roofing, managers and building owners have three options. They have three options: repair, restoration, or replacement of the roof.
When your roof is leaking, you must decide whether to repair, replace or restore it.
Option #1: Metal Roof – Repair and Maintenance
Metal roofs can be repaired or maintained. If the roof was installed correctly, it can last for 30 years. To prevent further damage, it is highly recommended that metal roofs be inspected on a bi-annual schedule.
Maintaining a metal roof system requires that you inspect it on a regular basis. It is better to identify problems early than they become more serious. For a lower cost, problems such as oxidation can often be fixed early. You can find fasteners that have backed out in the past and tighten them again to reduce leaks. This will also help to maintain your roof system.
Metal Roof Option #2 – Restoration
The frequency of leaks increases as a metal roof age. The roof’s condition and rate of leakage will eventually need to be addressed. Without a restoration scope, the roof will continue to age. You have a very limited time to put together a restoration plan before replacement is necessary.
A set of steps is usually required to restore metal roofs. These steps include fixing the above-mentioned defects, fastener replacement, and rust inhibitor. It is possible that additional repairs are required for details or penetrations. It is recommended that the roof surface be coated after repairs are completed.
There are two main types of coating materials. Acrylic coatings and urethane coats are the two main types of coating materials. Both of these options are available when it comes to metal roof restoration. Both have their own limitations that must be taken into consideration when designing the restoration plan.
#3: Metal Roof Replacement
The metal retrofit system is a new innovation in metal roof replacement. This is an option for replacing a low-sloped metal roof. This system is typically installed over a structural steel roof system. The existing roof becomes the metal deck for the new roofing system.
How it works
Installing the metal retrofit system involves filling the space between the metal panels with insulation boards. This creates a flush surface. Once the infill has been installed, an additional layer is added of insulation board. This creates a solid surface on which to apply the roof membrane. The final step is to install a single-ply membrane.
STEP 1: INSULATED IS FIRST ADDED BETWEEN METAL PANEL RIBS TO CREATE FLUSH SURFACE
A OTHER IMAGE OF INSILATION PANELS INSERTED BETWEEN METAL ROOOF PANEL RIZBS
STEP 2: THE FINAL LAYER INSULATION IS ADDED TO FLUSH SURFACE CRREATED
STEP 3: THE FINAL ROOFING SYSTEM IS INSTALLED OVER ROOF INSULATION
Simulated Standing Seam
Certain situations may not allow for a metal roof, but the job conditions might prevent it from being installed. A traditional metal roof panel may not be suitable for certain jobs, such as those with a complex layout or where there is a non-nailable surface.
Simulated standing seam roofing systems have been developed by single-ply manufacturers to meet the requirements of these special projects. This unique project situation has been addressed by Sarnafil’s Decor System. The standard PVC roof system is used in the system. A simulated standing seam is applied to the roof’s surface after the roof system has been completed. This simulates a standing seam, but has the advantages of a single-ply membrane.
