Butterfly roofs have gained popularity in modern homes and architecture due to their unique design and benefits.
A butterfly roof consists of two sloping sides that meet at a central ridge, creating a flat area in the middle. This design allows for more natural light and ventilation.
In terms of functionality, butterfly roofs are ideal for areas with high rainfall or snowfall, as the design helps to shed water and snow quickly.
Butterfly roofs can also be used to create a sense of openness and connection to the outdoors, making them a popular choice for modern homes and architecture.
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What Is a Butterfly Roof
A butterfly roof is a type of roof design that resembles the shape of a butterfly's wings, with a central valley and two sloping sides that meet at the top.
It's often used in modern and contemporary architecture to create a visually striking and unique appearance.
The butterfly roof is typically used for homes and buildings with a large footprint, as it can help to reduce the overall height of the structure.
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This design also allows for more natural light to enter the building, as the roof's slope and shape create a sense of openness and airiness.
The butterfly roof's unique shape can be a major selling point for homeowners, as it adds a touch of elegance and sophistication to the exterior of the property.
It's worth noting that the butterfly roof can be more expensive to build than traditional roof designs, due to the complexity of the structure and the need for specialized materials and labor.
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Design and Structure
Butterfly roofs are commonly associated with 20th century Mid-century modern architecture in the US.
The form has no gutter, which allows rainwater to run off the roof in no more than two locations, at either end of the valley.
The valley itself may be flat, with a central roof cricket diverting water towards the valley ends, or sloping if the entire roof form is tilted towards one end of the valley.
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Rainwater often runs into a scupper or downspout at the ends of the valley.
Butterfly roofs can be either symmetrical, with the valley located in the center, or asymmetrical with an off-center valley.
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Benefits and Drawbacks
A butterfly roof has its share of benefits and drawbacks. One of the main advantages is that it's wind resistant, able to withstand extreme winds and perform well in tropical storms.
The distinctive design of a butterfly roof also promotes good drainage, thanks to its angled V shape. This makes it an ideal choice for collecting rainwater for plants or other projects.
On the other hand, a butterfly roof can be quite expensive to build and install. In fact, it's more costly than a standard gable roof.
If you live in a snowy climate, you may want to think twice about a butterfly roof – it can give snow a place to build up. This can lead to problems down the line.
Here are some key benefits and drawbacks of a butterfly roof at a glance:
Pros and Cons
When building or renovating a home, it's essential to weigh the pros and cons of different design choices. A butterfly roof, in particular, offers a unique set of benefits and drawbacks.
The distinct design of a butterfly roof makes it a great option for those who want to withstand extreme winds. Its aerodynamic shape can perform well in tropical storms.
The angled V shape of a butterfly roof promotes water drainage, making it an ideal choice for areas with heavy rainfall. This design also allows for water collection, which can be useful for plants or other projects.
A butterfly roof's modern aesthetic makes it a great choice for those who want a sleek, contemporary look. Oversized windows can also be placed in the home, taking advantage of the unique design.
However, a butterfly roof is more costly to build and install than a standard gable roof. This increased expense is a significant consideration for many homeowners.
The inverted shape of a butterfly roof provides ample space for solar panels, making it a great choice for those who want to harness renewable energy. However, the angles of a butterfly roof can take away from potential attic or loft space in the home.
In areas with heavy snowfall, a butterfly roof may not be the best choice, as it can give snow a place to build up. This can lead to structural issues and other problems.
Here are the key pros and cons of a butterfly roof:
- Wind resistant – withstands extreme winds and performs well in tropical storms.
- Good drainage – promotes water drainage and allows for water collection.
- Modern aesthetic – coordinates with a modern aesthetic and allows for oversized windows.
- Space for solar panels – provides ample space for solar panels.
- Expensive – more costly to build and install than a standard gable roof.
- Not ideal for snowy climates – gives snow a place to build up.
- Little attic or loft space – takes away from potential attic or loft space in the home.
Using a in a Snowy Climate
Using a butterfly roof in a snowy climate can be challenging, but it's not impossible.
Butterfly roofs aren't ideal for snowy climates.
Snow will pile in the roof valley, so the structure needs to be strong enough to bear the weight.
A sound drainage system is also essential to prevent water damage.
Consult with an experienced contractor to discuss the details and ensure your roof is built to withstand the snow.
Drainage and Water Management
A butterfly roof's drainage system may seem unconventional, but it's actually designed to work with the unique shape of the roof.
The valley of a butterfly roof is angled, allowing water to collect in the middle and redirect toward a downspout or scupper.
In areas with heavy rainfall or snowfall, a greater angle of inclination is required to ensure proper drainage and water collection.
A butterfly roof can be designed in all angles, but most commonly, an angle of inclination within the range of 15-30 degrees is used.
To prevent water from seeping into the edges of the inner walls, an edge cover with a water dropline is often provided.
In some designs where the valley slope isn't significant, roof crickets are implemented to encourage proper drainage.
Materials and Construction
Metal is a common material used for butterfly roofs, but you can also use other standard roofing materials like asphalt shingles, tiles, or wood shake.
Butterfly roofs can be made with almost any material, allowing for a wide range of design options.
The unique shape of a butterfly roof doesn't require a traditional gutter system, which can be a plus for some homeowners.
Despite its benefits, a butterfly roof's design isn't ideal for every home, and its unique look may only suit a small subset of homes.
It's worth noting that butterfly roofs can reduce attic or loft space, which may be a consideration for homeowners with limited storage needs.
Daylighting and Ventilation
A butterfly roof is a great way to bring in natural light and warmth to your home. This type of roof allows light to travel deeper into the habitable spaces of buildings.
The design of a butterfly roof is key to maximizing daylighting. With higher edge walls and a roof surface sloping inwards and downwards to the center, light can penetrate deep into the room.
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In a cold climate, a butterfly roof is particularly effective at bringing in heat and light. It allows for a large amount of daylight and sufficient heat into the interiors through the large peripheral walls.
To get the most out of a butterfly roof, the ratio of the depth of the room to the height of the edge walls must be maintained. This ensures that light reaches the farther point possible and lights up a maximum volume of the room.
By incorporating a butterfly roof into your home design, you can enjoy a brighter and warmer living space, even on cloudy days.
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Frequently Asked Questions
What are the disadvantages of a butterfly roof?
Butterfly roofs can be more expensive and complex to build, and may result in awkward room shapes and sizes.
When were butterfly roofs popular?
Butterfly roofs were popular in the 20th century, particularly in Mid-century modern architecture in the US. They also appeared in Georgian and Victorian-era British cities, dating back to the 18th and 19th centuries.
Sources
- https://en.wikipedia.org/wiki/Butterfly_roof
- https://www.homedit.com/butterfly-roof/
- https://www.re-thinkingthefuture.com/architectural-facts/a3510-10-things-to-know-about-butterfly-roofing/
- https://www.dwell.com/article/modern-butterfly-roofs-fd4ab308
- https://www.huberroofing.com/blog/common-types-of-roofing-systems
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