Not Meeting Minimum Roof Pitch for Shingles Is A Common Problem
Many homeowners prefer the look of a shingle roof over other options like modified bitumen-rolled roofing. This is commonly referred to as Torch Down.
Unfortunately, it’s common practice in North Florida for roofing contractors to install shingles on roofs with slopes that are too low for this type of roofing application. Furthermore, building inspectors in our area have historically let these borderline shingle roof installations slide.
The result is a roof that leaks pre-maturely because of improper installation. It’s crucial that you know the minimum roof pitch for shingles and what roofing options are available for your home or business.
Minimum Pitch for Asphalt Shingle Roof
Shingles are designed for roof slopes that are greater than 2 inches of vertical rise over 12 inches of horizontal run. This is known as 2:12 slope.
That’s because shingles are designed so that the slope allows water to shed off. This eliminates the possibility of ponding water after a rainstorm.
Why Shingles Installed Over a Low Sloped Roof is a Problem
Shingles are meant to protect your home from UV rays and from heavy rains. The way that shingles are layered helps water drain into your gutter efficiently. However, with a lower slope asphalt shingle roof, water can collect beneath the shingles.
Low sloped roofs are particularly susceptible to wind-driven rain. Wind blowing up the roof slopes causes water to actually flow backward against the shingle. When this happens, water makes its way under the shingle and onto the secondary leak barrier.
In short? This means you could end up with a leaky roof.
So What Can You Do If Your Home Has This Problem?
If you’re not sure if you have a low slope roof, you can use an online calculator to determine the slope. You can also contact a professional to help you determine the slope of your roof. You’ll need to measure your roof with a tape measure to do the calculations to determine the slope.
There are a few options that can help you protect your home against leaks in this situation.
Option 1: Replace Your Existing Shingle Roof With A Roof System Designed For Low Sloped Roofs
In North Florida, the most popular roofing choice for low-sloped roofs is the Modified Bitumen Rolled Roofing system.
There are various configurations of this type of roof system available, including these three most common options:
- Torch Down Modified Roofing. This is a rolled roofing product that’s directly applied to your room using heat from a torch.
- Self Adhered (SA) Modified Roofing. This method uses rolled roofing products that have a built-in adhesive activated by a heavy roller to stick the product to your roof. You can have the self-adhering method applied in a two or three-layer system.
- Cold Modified Rolled Roofing. This method involves applying an adhesive using a brush or a trowel to the base layer of your roof.
Option 2: Restore Your Roof With A Roof Coating
If your roof has little or no sign of leaking and the wood decking is solid and dry, a roof coating might be a good option. This will help you prevent future leaks. There are many different types of roof coating that can be applied on low slope roofs.
In many cases, these roof coatings have a life expectancy of 15 years or more so it can be a cost-effective option. Another benefit is that there’s a reduced need for dumping large amounts of materials like metal roofing into landfills. Roof coatings offer a more environmentally friendly approach to keeping your home dry.
A roof covering can also help reduce energy costs. Because many roof coatings are white, they reflect the sun. This can reduce the surface temperature of your roof by as much as 50 -60 degrees.
In the right conditions, roof coatings have become a popular means of restoring a worn roofing system or replacing a roof that was improperly installed.
We understand how stressful it can be to afford a large unexpected home repair. The professionals at Endless Summer Roofing will also work with your insurance adjuster to help ensure necessary repairs are covered by your policy. Endless Summer Roofing also offers financing options for your new roof.
Whether you need repairs or a full roof replacement, Endless Summer Roofing Co. can help homeowners around North Florida find solutions to this very common roofing problem. Our estimates are free, so call us at (904) 664-7029 to schedule yours today. You can also email us at firstname.lastname@example.org.
2:12 Roof Pitch Options
If your roof’s slope is 2:12, here are the best options for your home or business:
Modified Bitumen Rolled Roofing System
With a Modified Bitumen Rolled Roofing System, your roof should last around 20 years.
- Torch Down Modified Roofing: It has seams that are heat-fused so it does not need to rely on adhesive. This is one of the most commonly used types for flat commercial roofs thanks to its waterproof membrane.
- Self-Adhered Modified Roofing: This is a safe, clean, and relatively simple roofing installation method. Not all self-adhering roofing products are created equal, so if you’re interested in this method, give us a call!
- Cold Modified Rolling Roofing: This is another easy-to-apply roofing option. These are also referred to as cold process BUR systems. They usually have polyester or fiberglass reinforcement felts. Our roofing contractors can help you apply this at the perfect rate, which is critical with cold-modified roofing rolling.
Metal Roofing Installation
Metal roofing is another great option for low slope roofs. Metal roofs made from copper or steel are ideal for homes with a nearly flat roof.
They can withstand extreme weather conditions due to their durability. Metal roofs are long-lasting but will be slippery when wet, which you should consider if you will need to head to your roof often.
Shingles on Low Slope Roof
While shingles are possible to have on a low slope roof, you have to be careful. If your rise over run ratio is less than 2:12, then you run the risk of leaks.
If you have an asphalt shingle roof, you will need additional layers for a very low slope. This could be a double layer of asphalt-saturated felt paper to keep your home protected.
Can you put shingles on a 2:12 pitch roof?
You can put shingles on a 2:12 pitch roof. However, this is the bare minimum roof slope that you can use shingles with. Steeper roofs both show off your shingles better and also drain better. If you are re-roofing, it’s best to double-check your slope before installing asphalt shingles.
Can asphalt shingles be used on a flat roof?
We do not recommend asphalt shingle roofs in this case. The water will not drain off of a flat roof quickly enough if you use asphalt shingles. Minimum slope requirement is of 2:12.