Types of Roofs

October 7, 2016

 

When building a new house or retrofitting an existing one, choosing the right type of roof can be more difficult than most people would think. Roofs do more than just serve a practical purpose of protecting a house and its occupants from outside elements. They can also add some additional space, make your home more energy efficient, and help bring in some natural light. Roofs also play a major role in defining the overall look and style of a house.

 

 
1. Gable Roof

 

Also known as pitched or peaked roof, gable roofs are some of the most popular roofs in the US. They are easily recognized by their triangular shape. 

Pros: Gable roofs will easily shed water and snow, provide more space for an attic or vaulted ceilings and allow more ventilation. Their inherently simple design makes it easy to build them and cheaper than more complex designs.

Cons: Gable roofs can be problematic in high wind and hurricane areas. If the frames are not properly constructed with adequate supports, the roof can collapse. High winds can also cause materials to peel away from gable roofs. If there is too much of an overhang, winds can create an uplift underneath and cause the roof to detach from the walls.

If a gable roof is used in high wind areas, be sure proper braces are used and have the roof inspected after a large storm to ensure no damage occurred.

Suggested materials: Gabled roofs can be covered with almost any type of material including asphalt shingles, cedar shakes, Terra Cotta, metal, and clay or concrete tiles. However, if the roof also contains hips and valleys, it should either be shingled or roofed with metal shingles or standing seam to help prevent roof leaks.

Note: It is recommended to use at least a 10/12 pitch, or 40° angle, for snowy regions.

Types of Gable Roofs

Side Gable: A side gable is a basic pitched roof. It has two equal panels pitched at an angle, meet at a ridge in the middle of a building. The triangle section can be left open for an open gable roof, or it can be enclosed for a boxed gable roof.

Crossed Gable: A crossed gable roof is two gable roof sections put together at a right angle. The two ridges are perpendicular to each other. Lengths, pitches or heights may or may not differ from each other.

It’s an excellent roof design for homes with separate wings. Use a cross gable to accent different areas of the home, such as the garage, porch or dormers.

It’s often seen in Cape Cod and Tudor styles houses.

Front Gable: A front gable roof is placed at the entrance of the house. This design is often seen in Colonial style houses.

Dutch Gable Roof: A Dutch gable is a hybrid of a gable and hip roof. A gable roof is placed at the top of a hip roof for more space and enhanced aesthetic appeal.

 

2. Hip Roof

 

 

A hip roof has slopes on all four sides. The sides are all equal length and come together at the top to form a ridge.

Pros: Hip roofs are more stable than gable roofs. The inward slope of all four sides is what makes it more sturdy and durable.

They are excellent for both high wind and snowy areas. The slant of the roof allows snow to easily slide off with no standing water.

Hip roofs offer extra living space for vaulted ceilings or an attic. They also provide more ventilation and ability to make additions, such as dormers or a crow’s nest.

Note: For high wind areas, or strong storms, a pitch of 4/12-6/12 (33°-50° angle) is recommended.

Cons: Hip roofs are more expensive to build than a gable roof. It’s a more complex design that requires more building materials. Also, additional seams can make it easier for water leaks to form if a roofing system is not properly installed.

Note: Proper construction and maintenance is a must to prevent minor issues from turning into major problems.

Suggested materials: Hip roofs, like gable roofs, can be with almost any type of roofing material, such as shingles, metal, or tiles.

Types of Hip Roofs

Simple Hip: The most common type of a hip roof. It has a polygon on two sides and a triangle on two sides. The sides come together at the top to form a simple ridge.

Cross Hipped: Similar to a cross gable roof. Use separate hip roofs on homes with different wings. The line where the two roofs meet is called a valley.

Note: Valleys can allow water to pool. Proper waterproofing is a must.

Half Hipped: A standard hip roof that has two sides shortened to create eaves.

3. Mansard Roof

 

 

 

A mansard roof, also known as a French roof, is a four-sided roof with a double slope on each side that meet forming a low-pitched roof.

The lower slope is much steeper than the upper. The sides can either be flat or curved, depending on the style.

Pros: Mansard roofs can help create a great deal of extra living space. Using the space as a full attic or living quarters, called a garret, is very popular. The style lends itself to either open or closed dormers for more aesthetic appeal.

Mansard roofs are great for people wanting flexibility to make future home additions. When first designing and building a home, you can actually save money by having a simple mansard design to start off. – You can then add on a garret or dormers at a later date. This will not only add value to the house, but it also allows homeowners to easily make additions as their needs change.

Cons: A low pitched portion of a mansard roof isn’t ideal for areas receiving heavy snowfall. 

Mansard roofs cost more than typical roofs because of the embellishments and details that go into them. But, the added space and character can more than make up for the extra cost of initial construction.

Suggested materials: Since a mansard roof has such a unique design, choosing a unique material could make the roof that much more special. Using metal, such as copper or zinc for the steep portion of the roof, can be more expensive up front, but will require much less maintenance down the road, making it a good long-term choice. 

Using wood or slate shingles in a diamond pattern is a way to make a mansard roof stand out. However, overlapping composition shingles should not be used. Asphalt shingles can still be used on a steeper portion of the roof in a regular pattern.

Most materials can be used for a mansard roof, but be aware of the low slope part of the roof. Ensure it is properly flashed and waterproofed to protect the roof’s integrity.

Types of Mansard Roofs

Mansard roofs can take various silhouettes, including straight-angle, convex or concave. Windows are very important to provide light for the extra living space provided. Grand houses may also display wood quoins, trim or decorative cut stone.

 

4. Gambrel Roof

 

 

 

 

A gambrel, or barn roof, is much like mansard in a sense that it has two different slopes. The difference between the two is that the gambrel only has two sides, while the mansard has four.

Similar to mansard, the lower side of the gambrel roof has an almost vertical, steep slope, while the upper slope is much lower.

Gambrels are not only seen on top of barns, farm houses and log cabins. They are also seen on Dutch Colonial and Georgian style homes, as well.

Pros: Much like the mansard, the gambrel provides extra living space for a garret, attic or loft. Plus it’s simple to frame out.

The gambrel only uses two roof beams, along with gusset joints. Since the construction is quite simple with fewer materials needed, this helps to keep the cost of a roof down.

Gambrel roofs are also a great idea for outdoor sheds and storage buildings. Their shape can provide more storage without taking up more space.

Cons: The gambrel roof is not recommended for heavy wind areas or regions that receive significant snowfall. The open design can cause the roof to collapse under extreme pressure. 

Gambrel roofs also need to be constructed well, waterproofed at the ridges and maintained on a regular basis. It’s a good idea to have a gambrel roof inspected each year to check for damage from storms, heavy rainfall or snow.

Windows are recommended to add light to the extra space. This is both a pro and a con. While all details will add to the overall beauty of a home, they increase chances for water leaks to occur.

 

Image source: MetalRoof.us

Suggested Materials: The material used for a gambrel roof will depend on the style of the house. Wooden, asphalt or slate shingles are widely used. However, using metal will greatly cut down on the amount of maintenance required.

 

Note: If a gambrel roof is used in extreme weather areas, insist on reinforced trusses, especially on the upper pitch.

5. Flat Roof

 

 

 

 

As the name suggests, flat roofs appear to be completely flat with no pitch. However, they do have a slight pitch to allow for water run-off and drainage. 

These roofs are generally used on industrial or commercial buildings. However, they can also be installed on residential houses in both high and low rainfall areas.

Most people don’t consider the amount of available outdoor living space a flat roof can provide. So, don’t completely dismiss them when building a new home! 

Pros: Extra living space on the roof for a patio, garden or partially enclose for a penthouse room. Heating and cooling units can also be placed on flat roofs, keeping them out of sight. – This is especially common practice in commercial roof designs.

The design is also conducive for installing PV solar panels for a more energy efficient and energy independent home.

Flat roofs are easier to construct than pitched roofs and require fewer building materials, keeping costs down.

Cons: The low pitch makes flat roofs more susceptible to water leakage. They are not advised for high rainfall or high snowfall areas. 

Although the upfront cost of building a flat roof is less expensive than a pitched roof, they can be more expensive in the long run due to maintenance and ongoing roof repair and replacement costs. 

Suggested Materials: Ensuring a flat roof is waterproof is imperative. Using material that is continuous with no seams is the best. The most common materials used are tar and gravel, roll roofing, metal sheets, PVC, TPO, and rubber membrane.

Note: Green roofs are also on the rise in popularity. They are aesthetically pleasing, energy efficient, thanks to all the vegetation acting as an additional layer of insulation, with cooling properties, and help combat the urban heat island effect. Layers are created using beneficial plant life, soil, drainage, and waterproofing membrane.

6. Skillion Roof