Corrugated Metal Roof – Ever since the mid 1800s, corrugated steel panels have been manufactured and used extensively on agricultural, commercial, and industrial roofs in the US.
You might conjure up the image of the old barns, farm houses, and old shacks covered with those “ugly” U-shaped or V-shaped wavy steel panels. Many of those agricultural and industrial steel roofs would often have numerous rust spots and peeling paint as their signature mark.
In those early days, some corrugated metal panels were made from bare, non-coated steel, which resulted in excessive corrosion, and hence bad reputation and perception of low quality.
Nonetheless, steel was cheap and abundant material, which made it economically feasible to replace any old, corroded steel panels on an “as and when needed” basis. Such were the expectations and process at the time.
But what about today? Lets take a deeper look into what modern-day corrugated metal roofs are all about and whether or not they are suitable for residential applications.
Modern, corrugated metal roofing panels are primarily made out of galvanized steel (G-60 low-end, or G-90 better quality) in the form of U, V, Ribbed, 5 V crimp and similar metal panels. —
Typically, corrugated metal and R panels are employed as metal roof or wall system comprised of 32 to 36 inches wide corrugated panels held in place by exposed screws / fasteners color-matched to the paint color of the metal panels. Caulking is used at connecting points of overlap in between the panels for water tightness.
- 1 Various Metals, Affordability, and Maintenance Requirements
- 2 Corrugated Metal Roof Design Ideas
- 3 Step 1 – Clean the Roof
- 4 Step 2 – Purchase a Primer
- 5 Step 3 – Apply the Primer
- 6 Step 4 – Purchase a Paint
- 7 Step 5 – Apply the Paint
Various Metals, Affordability, and Maintenance Requirements
Corrugated metal panels can also be made from galvanized, galvalume, stainless steel, and aluminum.
Normally, a corrugated metal panel does not have a lot of thickness in terms of metal grade, which makes it quite economical and hence affordable, but it may well require some maintenance every once in a while, including the exposed fasteners re-tightening and potential re-coating applications.
Corrosion Resistance & Panel Thickness
Modern corrugated metal panels offer superior corrosion-resistance, energy efficiency, and can provide an economical roofing and cladding solution for commercial, agricultural, industrial, and even residential uses.
Corrugated metal panels are usually made from thin-gauge steel, usually a 29 or 26 gauge steel, which makes it economical and practical, when it comes to covering large areas of roofing surfaces. Corrugated metal roofs are more practical and longer lasting than asphalt shingle roofs, and they cost much less than standing seam or metal shingles.
Corrugated metal roofs are more practical and longer lasting than asphalt shingle roofs, and they cost much less than standing seam or metal shingles.
Corrugated roofing panels can be made from aluminum, galvanized steel (G-60, or G-90 steel), galvalume coated steel, and stainless steel. When going for a long lasting economical solution, galvalume steel provides an optimal combination of cost effectiveness and material longevity and reliability.
When finished with a Kynar 500 paint finsh, corrugated metal roofing can provide significant energy savings and qualify for LEED building credits issued by the US green building council.
Ribbed panels or R-panels – a Close Cousin of Corrugated Metal
In commercial, agricultural, industrial, and some residential metal roof and metal wall panel applications, corrugated metal panels along with their close cousin, ribbed panels, are often a system of choice based on two important factors; they are rather inexpensive, fairly long-lasting and energy efficient roofing and metal siding alternatives for residential and commercial building envelope applications.
Corrugated steel panel presented above is LEED certified, inexpensive roofing solution for commercial and industrial uses. It is light weight, provides solar reflectivity, and good thermal emmitance, which will help keep the building cool.
The downside of using corrugated and ribbed metal roofing systems such as 5-v crimp panels, R panels, U panels, and V panels, is that most of these systems come with exposed fasteners. For comparison, standing seam metal panels have concealed fasteners, which offers higher degree of weather and water tightness, but standing seam is a significantly pricier option.
A corrugated metal roof is an excellent, hard-wearing choice for many DIY projects, such as building outhouses and sheds. This roofing material has a typical lifespan of 20-100 years if taken care of properly.
Corrugated Metal Roof Design Ideas
To maintain the roof’s integrity and condition, you must protect the metal with a layer of paint. With the correct paint and application technique, you can paint it once for up to 10 years of protection. Get started painting your corrugated metal roof below.
Step 1 – Clean the Roof
The first trick to painting a corrugated metal roof is to not paint on a dirty roof. Before applying a new coat of paint, you need to get rid of any debris and dirt buildup that already exists.
Maintaining the Roof
Keep in mind that if your metal roof is located underneath trees, dirt and debris will accumulate on your roof more quickly. Therefore, you should periodically clean the roof after you paint it, so that it stays in good condition.
Using a Power Washer
Warning: When working with bleach, wear the appropriate safety gear, such as a breathing mask and safety gloves. In addition, exercise caution when using a ladder to get to the roof. Have a friend hold the bottom of the ladder for extra security.
Use a ladder to get to the roof, and then use a power wash to clean it free from any flakes of rust or mold. For stubborn rust patches, use a wire brush. Then, use a solution of chlorinated bleach and warm water to clean away and mold or mildew. Let the roof dry completely before moving on to the next step.
Step 2 – Purchase a Primer
Next, find a galvanized-metal primer to prepare the surface for painting. These primers are usually solvent-based, though some acrylic-based varieties are available. Speak to the staff at a local specialized paint shop for advice.
Step 3 – Apply the Primer
Once you have the primer, apply it according to the manufacturer’s instructions. Allow it to dry completely before applying any paint.
Step 4 – Purchase a Paint
The type of paint you should use for the top coat on your corrugated metal roof will depend on the weather conditions and roof position. A roof that will be often exposed to direct sunlight will perform best with a different paint composition than one in a damp, shaded area. To make the optimum choice for your roof, consult a paint specialist.
Step 5 – Apply the Paint
Before applying paint, read the manufacturer’s instructions thoroughly to check the recommended thickness of each paint coating. In addition, assess the weather.
Don’t start painting the roof if it’s expected to rain in your area within 24 hours, or if temperatures will be dipping below 40 F during any stage of the painting or drying process.
Paint the coats evenly, making sure to get into all crevices. Generally, you should apply two coats of paint to the corrugated metal roof to achieve the right color. Leave the paint to dry completely between coats.
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