Friday, December 2, 2022
HomeEditor PicksHow To Roof A Low Pitch Roof

How To Roof A Low Pitch Roof

Finding The Right Products For Your Low

How To Properly Re-Roof A Low Slope Roof

Residential low slope roofing can generally be divided up into two broad categories: larger flat roofed applications such as residential condominium complexes, row homes, and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically from steep slope to low slope on the same structure.

Table Of Minimum Acceptable Roof Pitches

If you need help figuring out the slope or pitch of your roof, we recommend . Its very inexpensive and very accurate.

Minimum Slope for Roofing Materialsas required by the International Building Codeor the International Residential Code
Roofing Material or System
Built-Up Roof, Coal Tar Pitch -in-12
Clay Tile, Barrel, Mission or Two-Piece 4-in-12
Clay Tile, Barrel, Mission or Two-PieceWith Special Underlayment Requirements
Clay Tile, Barrel, Spanish or S-Shaped 4-in-12
Clay Tile, Barrel, Spanish or S-ShapedWith Special Underlayment Requirements
Concrete Tile, Barrel, Mission or Two-Piece 4-in-12
Concrete Tile, Barrel, Mission or Two-PieceWith Special Underlayment Requirements
Concrete Tile, Barrel, Spanish or S-Shaped 4-in-12
Concrete Tile, Barrel, Spanish or S-ShapedWith Special Underlayment Requirements

Is A 3/12 Roof Pitch Good

Any roofs up to 3:12 are generally considered low slope. In the residential arena, we see lower slope roofs as part of the home’s architectural design. … Then, when you get into roofs of 3:12 or greater pitch, most other metal roofs can be used and that generally is the pitch requirement for asphalt shingles as well.

Don’t Miss: Roof Overhang Extension

Best Profiles For Low

The best profiles to use for low-slope projects will be mechanically-locked metal roof systems. Mechanically seamed panels are rollformed with specific edges that line up with each other. Once the two panels are engaged, a hand or mechanical seamer is used to bend the edges and lock the panels together.

There are two different versions of mechanical seams:

  • Single-lock
  • Double-lock

For low-slope systems, double-lock mechanically seamed profiles are going to provide the most protection and extra weather-tightness. Plus, there is less of a chance for panels to come unseamed, which is important in low-slope situations and in locations where freezing and thawing take place. For example, snap-lock profiles are more susceptible to disengaging due to thermal movement of built-up snow and ice.

Surprisingly, a lot of the . If you want a metal roof and its a low-sloping roof, you should go with a mechanical lock profile. Keep in mind that because a mechanically locked system requires seaming, it might not look as clean as a snap-lock profile. However, a mechanical profile will perform better, which is more important.

Lets go through a few examples of low-slope profile options.

  • Panel Width: 18 | 16
  • Seam Height: 2.0
  • Panel Material: 22 to 24-gauge min steel | .040 aluminum
  • Panel Surface: Smooth | Embossed optional
  • Panel Clip: Required per engineering
  • Minimum Slope: .5/12 for steel | 2/12 for aluminum
  • Substrate: Open framing, plywood, b-deck, b-deck w/ ISO

Reshingling A Low Slope Roof And A Few Things Not To Do

Roof Replacement

Visiting my sister in Thunder Baythis summer , there was, as usual, a project, likeeveryothertime

This time it was the roof over the bathroom addition. Whenever there was a lot of rain,water would start dripping in through the bathroom fan in the ceiling. The fan vented through a roofvent, and something around there somewhere was leaky. Previous attempts had beenmade to seal it with roofing cement, but it still leaked. I thought I might have found the leaky spot on my last visit,and slipped in a piece of aluminium flashing todirect water away from it, but that didn’t help any.

The ends of the sheathing boards were exposed, and they all looked questionable,certainly, some of them were warped. Between that and the leak thathad been there for years, we weren’t sure if the sheathing was still good.

With roughly a 2:12 slope on this roof, it doesn’t take much of a ripple on the roof to reverse the slope and cause water to flow back into the shingles. Here’s a spot that looked questionable, although that spot wasn’t actually leaky.

You May Like: Rv Vinyl Roof Repair

Low Pitch Roof Solutions: Which Tiles And Slates Are Best For My Roof

Low pitched roofs are commonly used on domestic extensions, and having a range of low-pitch roofing solutions is, therefore, more important to our customers than ever.

There are currently many different options on the market that are ideal for those looking to tile a low pitch roof, including clay and concrete tiles as well as felt and cedar shingles.

Understanding the range of materials available as well as the different options will help customers select the optimum tiles or alternatives to protect their roof and create an aesthetically pleasing finish.

Recommended Reading: How Much Does It Cost To Recoat An Rv Roof

Your Low Slope Roofing Materials Guide

If you were unsure if low slope roofing would be right for you, this low slope roofing materials guide has surely shown you all its benefits. From affordability to being easy to maintain, your low slope roofing will last a long time while being very stylish as well.

To learn more about roofing, contact us here.


Also Check: Cost To Reseal Rv Roof

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, its 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. Its crucial that you know the minimum roof pitch for shingles and what roofing options are available for your home or business.

Standing Seam Metal Roof

Low Slope Roofing Installation Guide – by Roof Repair 101

A standing seam metal roof system is a series of metal panels that are locked together at the seams or seamed mechanically. This allows for panels to expand and contract freely when the metal panels go through thermal expansion.

A standing seam metal roof is a great roofing material for a flat roof. It has better aesthetics with more color options and is longer-lasting than the membrane roof systems.

As long as its properly installed and your attic is adequately ventilated, theres no reason you shouldnt get at least 30 years out of your standing seam metal flat roof. Under the ideal conditions, a standing seam metal flat roof could last for 50 years.

But this extra life and aesthetics comes at a higher price and is more expensive than all 3 types of roof membranes.

Read Also: Adding Gable Overhang To Existing Roof

Why Is A Roofs Slope Important

When you look at a roof, have you ever thought about why they are so steep or so flat? If youre not into construction, you probably havent. But, as mentioned, the roof pitch is one of the most crucial factors when building a structure. Some of the main reasons why you need to get your pitch right are:

Standing Seam Metal Roofing

Standing seam metal roofing is sheet metal that has a flat appearance in the center and vertical ribs at the panel edges, creating a smooth, streamlined appearance.

Low slope standing seam roof

Its the most weather-tight metal roofing system because its attached with concealed fasteners and does not have screws penetrating the surface like corrugated metal roofing does.

There are three different types of standing seam panels. For a low slope roof application, a double lock mechanically seamed system should be used for maximum weathertightness. This type of standing seam roof is an excellent choice in climates that have extreme weather conditions.

For more information on the different standing seam roofing systems, click the banner below:

You May Like: Cost To Replace Roof Sheathing

What Is A 3/12 Slope

What is roof pitch? … For example a 3 pitch or 3 in 12 pitch or 3/12 pitch, all mean that the roof rises 3 inches, for every 12 inches of it’s horizontal run. Using pitch, its footprint, and basic geometry, you can quickly and with a high degree of accuracy calculate the length of the gable sides.

Roof Restoration To Extend The Life Of Your Flat Roof

Asphalt Shingle On A Low Slope Roof?

Roof restorations make your roof new again and resolve existing roofing issues. That way, you wouldnt have to change your roof which is a costly project.

If this is your first time to hear about a roof restoration service, heres what its about. Roofing restoration entails cleaning the roof, repairing, and replacing some materials to make it brand new. Previously, we featured a guide about roof restoration. In there, we explained that a roof restoration improves your flat roof in various ways so it lasts longer:

  • Makes your building more energy-efficient
  • Improves the overall look of your commercial roofing system
  • Strengthens your roof so that it becomes resilient to environmental damage

Here at Cox Roofing Systems, we also offer quality restoration services. We recommend our exclusive TTR which combines EPDM and polyurethane insulation.

Also Check: Skylight Metal Roof

How To Determine The Slope Of A Roof

If youre unsure of what the slope/pitch of a roof structure is, its relatively easy to measure. To determine your roof pitch, youll need to measure how many inches your roof rises over every 12-inch run.

Using a measuring device, move inward on the flat roof plane 12 inches. Once you reach 12 inches, mark it, and then measure how far the roof rises perpendicular to the ground. For example, if your roof rose 8 inches for every 12 inches, the roof pitch is 8/12.

If you cant reach your roof or feel uncomfortable climbing a ladder, dont hesitate to ask your roofing contractor to do the measurement for you.

Where Are Low Slope Roofs Most Common

Low slope roofing is most common in arid, or desert like, climates where there is a general lack of precipitation.

Low slope roofing is more prone to water damage when the roof is in an area with high precipitation. In these cases, if the roofing material used is not suitable for low slope roofing and has rainwater sit on it for an extended period of time, leaks can occur because the water is unable to runoff as easily as when it’s on a standard or high slope roof.

Low slope roofing is also commonly seen on commercial buildings. This is because they are more cost effective compared to standard slopes and also allow businesses to store and maintain their A/C units on the top of the building.

Recommended Reading: Roof Replacement Cost California

At Tornado Roofing We Comply With Florida Building Codes

At Tornado Roofing, we are compliant with all Florida Building codes and offer reliable roofing installation and repair services. We will perform a new roofing installation, depending on your needs, at affordable costs, and offer expert advice on all your roofing needs. Contact us and get your roofing solution.

A low pitch roof requires materials with special functionalities, including cooling roofing, to make it more effective. Low pitch roofs are susceptible to water clogging and leaking, which can lead to constant repair and frustration. Installing a new low-slope system from the start with the help of experts guarantees quality results and gives you peace of mind. Feel free to share your roofing needs with us.

How To Calculate Roof Pitch

How to install shingles on low slope roofs

To determine your roof pitch, hold a level with one end resting on the roof. Lift the other end in the direction of the slope of the roof, with the end resting on the roof at a higher point than the end you’re holding. Raise or lower the level until you get a level reading. Measure out 1 foot from the end that is touching the roof. Measure down from the 1 foot point to the roof. If it is 4 inches, you have a 4/12 pitch, and so forth.

Recommended Reading: How Much Roof Overhang On Shed

Minimum Roof Slope And The Building Code

For each type of roofing material, you can see the actual language used in the model 2018 International Building Code at the UpCodes website.

Click to see Section 1507 .

To jump to the subsection for your type of material, click the name of the material in the code index on the left side of the page .

For the actual language in the model 2018 International Residential Code, click to see Section R905 .

What You Need To Know About Re

The Basics About Low-slope RoofsIts not just commercial property that has low-slope, or flat, roofing. Some residential properties do too, especially modern-style homes built in the 1960s that sometimes have slopes as low as one foot of rise per 12 feet of run .

But even if your main roof is medium to high in pitch, you may well have a garage or porch covering that is low-pitched. This area of your roof will require a somewhat different approach and maybe different roofing material.

As lower pitches can be more prone to leaking, it is especially crucial that the right material and the right techniques be used. A professional contractor will know how to handle this aspect of roof replacement.

Material Options For Low PitchesThere are as many material options for low-pitch roofs as for regular ones Sometimes there are fewer viable options with extremely high pitches, but this is no problem with low slopes.

Here are some of the most popular materials used with low-pitched roofs during roof replacement:

Installation Of Roll RoofingThe most common low-slope roofing jobs with most homes in Central Florida involve garage, shed, and porch roofs. Most commonly, some form of rolled roofing will be used.

The roof deck must be clear and clean, and all nails and staples must be pulled out. Any damaged plywood needs to be replaced, and then felt underlayment should be laid down.

Recommended Reading: Cost To Reroof A House In California

Question: Is There A Double Layer Of Felt On My Low Slope Mobile Home Roof

I have a doublewide mobile that the contractor says he put double felt on. I was not on site that day.

Roof is now coverded in 30 year composite shingle. The city inspector says it’s a single layer of felt.

With flashing all around the edge of the roof I’m wondering where he’s looking? Contractor is standing by his statement.

Without opening up this roof, how do I tell which story is true?

Reply: Check the gable end edges of the roof

It’s possible that your city inspector saw something that you didn’t. Perhaps drip edge is installed only on the lower edges and not at the roof eaves.

But as we explain in detail at UNDERLAYMENT DOUBLE vs SINGLE, it’s usually pretty easy to determine if there is just a single layer vs double-coverage installation of roofing felt by observing the amount of overlap of the roofing felt plies at the gable end of the roof.

My illustration above, adapted from Steve Bliss’s Best Construction Practices is discussed in more detail at ROOFING UNDERLAYMENT BEST PRACTICES.

Roof Pitch: Steep Vs Low Slopes

Low Pitched Roofing

The steepness of your roof – known as the roof pitch or slope – is an important decision to make for your home. Knowing the difference between a steep pitch, a low pitch or somewhere in between is something you want to be comfortably informed about when considering roofing changes.

Steep pitch vs. low pitch styles

To start, lets discuss how pitch is measured. In the United States you typically see pitch described as 8/12, 6/12, 4/12, etc. The first number represents the vertical rise in inches and the second refers to horizontal progression in inches. As an example, 8/12 means that for every foot, the rooftop rises 8 inches. Slopes around 6/12 are the most common, while anything below 4/12 is typically considered a low pitch.

A steep pitch has several advantages. Many residential rooftops are designed for steeper pitches because they look elegant and pleasing to the eye. They leave plenty of room for second stories, gables and attic spaces, and they allow you to experiment with interesting siding, trim or eave styles.

However, the higher the pitch, the more square feet the roof takes up and the more materials your roof needs . Not only will you need more shingles, but you’ll also need extra flashing for ridges and valleys, as well as extra work if you want any gables or complex eaves.

Materials and weight

Remember the weather

You May Like: Roofing Cost Los Angeles

What Should I Use On Low Slope Roofing

At A & E Brothers Roofing we think choosing the right roof for your home involves taking stock of your homes physical requirements and your own roofing expectations. If you value economically and ecologically sound building materials, then single-ply roofing may be the way to go. If youre more invested in finding a structurally sound, watertight option, built-up roofing might be the appropriate fit.

If youre looking for the best of both worlds and are looking for a sturdy yet reasonably priced roof, modified bitumen roofing will fill that role. Speak to your roofing professionals in Miami about your needs as a homeowner to find the perfect low-slope roof for your building or home.

Testing Of Low Slope Metal Roofing Systems

Low-slope and steep-slope roofing systems have different industry standard testing requirements. Low-slope metal roof systems are tested to ASTM E2140 standards, a water penetration test evaluating the resistance of roof panels vertical seams.

During this test, the roof panel system is completely submerged under six inches of water for approximately six hours. Static water pressure is then applied to the outside face of the roof panel, which tests the roofs ability as a water barrier. This method is intended to evaluate the water barrier of roof systems with a pitch below 3/12.

Read Also: Cost To Reseal Rv Roof

Read Also: Install Ondura Roof Panels


Most Popular