Bastard Hip Roof Calculator

A Bastard Hip Roof, also known as a Dutch Hip Roof or Half Hipped Roof, combines elements of both a hip roof and a gable roof. It features sloping hips on most sides, with small gable sections at one or both ends. This design offers an attractive roofline, additional attic space, and good wind resistance, making it suitable for various architectural styles.

Hip Roof Calculator

Bastard Hip Roof Calculator

CharacteristicDescription
Roof TypeCombination of hip roof and gable roof
Design VariationOne or both ends of the roof have small gable sections
Roof SlopeVaries; hips typically have a gentler slope, gables steeper
AestheticsProvides a more dynamic and interesting roofline
Attic SpaceOffers more usable attic or storage space than a full hip
VentilationProvides opportunities for additional ventilation
DrainageGenerally good drainage due to the sloping sides
Wind ResistanceGood resistance to wind, especially on the hipped sides
Roofing MaterialsVarious roofing materials can be used, depending on pitch
MaintenanceMaintenance can be more complex due to varied roof elements
Architectural StyleCommonly used in traditional and colonial-style architecture
CostCost may be higher than a standard hip or gable roof
Common UsesResidential homes, cottages, barns, and some commercial
Local Building CodesEnsure compliance with local building regulations

FAQs


How do you calculate a broken hip roof?

Calculating a broken hip roof involves determining the dimensions and angles of the roof’s various sections. To estimate it, you would need to measure the lengths of the different roof slopes and the angles of the hip and valley lines. This can be complex and may require the use of trigonometry or specialized software. For an accurate calculation, it’s best to consult with a professional architect or engineer.

Can you have two different pitches on a hip roof?

Yes, you can have two different pitches on a hip roof. It’s called a combination hip roof, where one section of the roof has a different pitch than the rest. This design can be used for aesthetic or functional reasons.

What is the slope angle for a hip roof?

The slope angle for a hip roof typically ranges from 30 to 45 degrees. However, it can vary depending on design preferences and local building codes.

How far can a hip roof span?

The span of a hip roof can vary greatly depending on factors like the size of the building, the roof’s pitch, the type of roofing material used, and local building codes. In general, hip roofs can span significant distances but should be designed by a structural engineer to ensure they meet safety requirements.

What is the formula for calculating roofing?

The formula for calculating the area of a roof (in square feet or square meters) is:

Area = Length x Width

For more complex roof shapes, you may need to break the roof into smaller sections and calculate each section separately.

How much more is a hip roof?

Estimating the cost difference between a hip roof and other roof types can vary widely based on factors like the size of the roof, materials used, labor costs, and location. On average, a hip roof can be more expensive than a simple gable roof due to its complexity. It’s best to obtain quotes from roofing contractors for a specific cost comparison.

What is the minimum pitch for a hip roof?

The minimum pitch for a hip roof typically depends on the roofing material being used. For most common roofing materials like asphalt shingles, the minimum pitch is often around 4:12 (4 inches of vertical rise for every 12 inches of horizontal run). However, it’s essential to check local building codes and manufacturer recommendations, as these requirements can vary.

Can you have a loft conversion with a hip roof?

Yes, it’s possible to have a loft conversion with a hip roof. However, the conversion may be more challenging due to the sloping angles of the roof. It may require modifying the roof structure and adding dormers or other architectural features to create usable space.

Can a hip roof have a gable?

A hip roof typically does not have a gable, as the design of a hip roof involves all sides sloping downward to form hips at the top. However, it is possible to incorporate gable elements into the design for aesthetic or functional reasons, but this would no longer be a traditional hip roof.

How do you find the pitch of a hip roof?

To find the pitch of a hip roof, you can use a protractor to measure the angle of one of the roof slopes. The pitch is typically expressed as a ratio, such as 4:12, which means the roof rises 4 units vertically for every 12 units horizontally. Alternatively, you can use a pitch gauge or a smartphone app designed for this purpose to measure the pitch accurately.

Is a 45-degree roof steep?

A 45-degree roof is relatively steep. It means the roof rises 45 degrees from horizontal, and this angle can be challenging to walk on and may require special safety precautions during installation and maintenance.

What is the minimum roof slope degree?

The minimum roof slope degree can vary depending on the roofing material used and local building codes. However, a common minimum slope for residential roofs is 2:12, which corresponds to about 9.5 degrees. This slope allows for adequate drainage and prevents water from pooling on the roof.

Does a hip roof need ceiling joists?

A hip roof may or may not require ceiling joists, depending on the specific design and structural requirements of the building. Ceiling joists are often used to support the ceiling and help distribute the load from the roof. The need for ceiling joists should be determined by a structural engineer or architect.

How many rafters do I need for a hip roof?

The number of rafters needed for a hip roof depends on the size and design of the roof. Typically, there is a series of common rafters and hip rafters. The total number of rafters will depend on the number of roof planes and the spacing between rafters. It’s essential to consult with an architect or engineer for an accurate calculation.

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How much weight can a hip roof hold?

The weight a hip roof can hold depends on various factors, including the roof’s design, the materials used, and the structural integrity of the supporting walls and foundation. An engineer should evaluate the specific building to determine its load-bearing capacity.

How do you calculate roof slope?

Roof slope is usually calculated as a ratio of the vertical rise to the horizontal run. For example, a 4:12 roof slope rises 4 inches for every 12 inches of horizontal run. You can measure the rise and run on the roof and then calculate the slope using this formula:

Slope = Rise / Run

How do you calculate m2 of a roof?

To calculate the square meters (m²) of a roof, you can measure the length and width of each section of the roof and then multiply the length by the width for each section. Finally, add up the areas of all sections to get the total square meters. The formula is:

Total Area (m²) = Area of Section 1 (m²) + Area of Section 2 (m²) + … + Area of Section n (m²)

Can I measure my roof from Google Maps?

You can get a rough estimate of your roof’s dimensions using Google Maps, but it’s not recommended for precise measurements. The accuracy of Google Maps can vary, and it may not provide the level of detail required for accurate roofing measurements. It’s better to measure your roof on-site or hire a professional for precise measurements.

What are the disadvantages of a hip roof?

  • Complexity: Hip roofs are more complex to design and build compared to simple gable roofs, which can increase construction costs.
  • Limited Attic Space: The sloping sides of a hip roof can limit the usable attic space compared to a gable roof with a higher central ridge.
  • Maintenance: The multiple roof planes of a hip roof can make maintenance, repairs, and re-roofing more challenging and costly.

How much is a hip roof in the UK?

The cost of a hip roof in the UK can vary widely depending on factors such as the size of the roof, the type of roofing material used, labor costs, and location. As of my last update in 2021, the cost could range from £80 to £120 per square meter for a basic hip roof. However, prices may have changed since then, and it’s advisable to obtain quotes from local roofing contractors for accurate pricing.

Is a hip roof better than wind?

Hip roofs can be more aerodynamic than gable roofs and may offer some advantages in windy areas. The sloping sides of hip roofs can help reduce wind resistance and minimize the risk of wind damage. However, the effectiveness of a hip roof in high winds also depends on its design, materials, and structural integrity.

What happens if roof pitch is too low?

If a roof pitch is too low, it can lead to several issues:

  • Poor Drainage: Low-pitched roofs may have inadequate drainage, leading to water pooling, leaks, and potential roof damage.
  • Limited Attic Space: Low-pitched roofs often result in limited attic or storage space, making it less functional.
  • Reduced Longevity: Roofing materials on low-pitched roofs may have a shorter lifespan due to increased exposure to the elements.
  • Increased Risk of Leaks: Low-pitched roofs are more susceptible to leaks, especially in heavy rainfall or snow.

What roof tiles go down to 12.5 degrees?

Roof tiles suitable for a pitch as low as 12.5 degrees are typically referred to as “low-pitch” or “low-pitched roof tiles.” These tiles are designed to provide proper water shedding on roofs with minimal slope. It’s essential to choose tiles specifically rated for low-pitched roofs to prevent water infiltration.

Can you walk on an 8-pitch roof?

Walking on an 8-pitch roof (8:12 slope) can be challenging and dangerous, especially if it’s steep. Safety precautions, such as using proper roofing shoes and safety harnesses, should be taken. It’s often recommended to leave roof inspections and maintenance to professionals when dealing with steep roofs.

Is it illegal to convert a loft without building regulations?

In the UK, it is generally illegal to convert a loft without obtaining the necessary building regulations approval. Converting a loft without proper approvals can result in legal issues, difficulties when selling the property, and potential safety hazards. Always check with your local building authority and follow the regulations for loft conversions.

What type of loft cannot be converted?

Lofts with insufficient headroom, structural issues, or those in buildings with restrictions due to conservation areas or listed status may be challenging or impossible to convert. The feasibility of loft conversion depends on various factors, and it’s best to consult with a structural engineer or architect for a thorough assessment.

Can you put a dormer on a hip roof?

Yes, you can put a dormer on a hip roof. A dormer is a structural element that protrudes from the roof, providing additional space and light in an attic or loft. Dormers can be added to various roof types, including hip roofs, to create usable space and improve aesthetics.

Do you need planning permission for hip to gable roof?

In the UK, converting a hip to gable roof as part of a loft conversion may require planning permission. The need for planning permission depends on factors such as the size of the extension, the property’s location, and local regulations. It’s advisable to consult with your local planning authority or a professional architect to determine the specific requirements for your project.

Does a hip roof leak?

Hip roofs can be prone to leaks, just like any other roof type, if they are not properly constructed, maintained, or if roofing materials deteriorate over time. Proper installation, regular inspections, and timely maintenance are essential to prevent leaks in hip roofs.

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What is the difference between a pitched and hip roof?

A pitched roof is a broad term that encompasses various roof types, including hip roofs. The primary difference is that a pitched roof has sloping sides, whereas a hip roof has sloping sides on all sides, meeting at a common point. A hip roof is a specific subtype of pitched roof.

How thick should a hip rafter be?

The thickness of a hip rafter depends on factors like the roof’s design, load-bearing requirements, and local building codes. Hip rafters are typically larger and stronger than common rafters. Consult with a structural engineer or architect to determine the appropriate thickness for hip rafters in your specific roof design.

Can a roof have two different pitches?

Yes, a roof can have two different pitches. This design is often referred to as a “multi-pitch roof” and is used for architectural aesthetics or functional reasons. It involves transitioning from one pitch to another on the same roof.

What is the golden ratio for roof pitch?

The golden ratio (approximately 1.618) is not typically used to determine roof pitch. Roof pitch is usually determined based on functional and aesthetic considerations, as well as local building codes. The golden ratio is more commonly associated with proportions in art, architecture, and design.

What pitch roof is safe to walk on?

Roofs with a pitch of 4:12 (about 18.4 degrees) or less are generally considered safe to walk on, provided that proper safety precautions are taken. Steeper roofs can be hazardous to walk on, and safety equipment should be used.

What is the most common roof pitch?

The most common roof pitch for residential buildings in many regions is around 4:12 (18.4 degrees). This pitch provides a good balance between water shedding and walkability.

What is the minimum pitch for a roof in the UK?

In the UK, the minimum pitch for a roof is typically around 15 degrees (3:12 pitch). However, some roofing materials may require a steeper pitch for proper water shedding and durability. Always check with local building codes and manufacturer recommendations.

Is 2 degrees enough for a flat roof?

A 2-degree pitch is generally not sufficient for a flat roof, as it may not provide proper drainage. Flat roofs typically have a slight slope, often around 1/4 inch per foot (1:48 pitch), to ensure water flows toward drainage points or scuppers.

What is the maximum permitted slope for a low-slope roof?

The maximum permitted slope for a low-slope roof, also known as a flat roof, can vary by local building codes and the type of roofing material used. In some cases, it may be around 3:12 (about 14 degrees) or less.

Do hip roofs have load-bearing walls?

Hip roofs distribute the roof load evenly to all four sides, so they don’t require central load-bearing walls like gable roofs. However, they rely on load-bearing walls or supports around the perimeter of the building to transfer the roof load to the foundation.

Is a hip roof stronger than a gable roof?

Hip roofs are often considered more aerodynamic and stable in windy conditions compared to gable roofs. However, the strength of a roof depends on various factors, including the quality of construction, materials used, and design. Both hip and gable roofs can be strong when built to code and properly maintained.

Do you need noggins between roof rafters?

Noggins (cross-braces) between roof rafters can help stabilize and strengthen the roof structure. They are often used to prevent rafters from twisting and improve overall structural integrity. The need for noggins depends on the specific roof design and local building codes.

How far apart should trusses be in a hip roof?

The spacing between trusses in a hip roof can vary depending on factors like the size of the roof, the type of trusses used, and the local building codes. Typically, trusses are spaced 24 inches (61 cm) apart, but this spacing may need to be adjusted based on structural requirements.

Are hip rafters load-bearing?

Yes, hip rafters are load-bearing structural elements in a hip roof. They help support the roof’s weight and transfer it to the building’s walls or other load-bearing elements.

How do you calculate hip rafter size?

Calculating the size of a hip rafter involves considering factors such as the roof span, the roof pitch, the type of roofing material, and local building codes. It’s a complex calculation that is typically done by a structural engineer or architect to ensure it meets safety and load-bearing requirements.

How much more expensive is a hip roof?

The additional cost of a hip roof compared to a simple gable roof can vary significantly based on factors like the size of the roof, the complexity of the design, the materials used, and local labor rates. As a rough estimate, a hip roof can be 10-20% more expensive than a gable roof.

How far can a hip roof span?

The maximum span of a hip roof depends on various factors, including the type of construction materials used, the pitch of the roof, and local building codes. As a rough estimate, a hip roof can span up to 30 feet (9 meters) or more, but it’s essential to consult with a structural engineer for a precise calculation based on your specific project.

What is a 30% roof slope?

A 30% roof slope means that for every 100 units of horizontal distance, the roof rises by 30 units vertically. In degrees, this is approximately a 16.7-degree slope. This slope is considered moderate and is suitable for various roofing materials.

What is the pitch of a 45-degree roof?

A 45-degree roof has a very steep pitch, where the roof rises 45 degrees from horizontal. In the ratio commonly used to describe roof pitch, it’s equivalent to 12:12 (12 inches of vertical rise for every 12 inches of horizontal run).

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What roof pitch is 30 degrees?

A roof with a 30-degree pitch has a slope where the roof rises 30 degrees from horizontal. In the ratio commonly used to describe roof pitch, it’s equivalent to 7:12 (7 inches of vertical rise for every 12 inches of horizontal run).

What is the formula for measuring a roof?

To measure a roof’s square footage, you can use the formula:

Area = Length x Width

For more complex roof shapes, you may need to break it down into smaller sections and calculate each section separately, then sum them up for the total area.

How do I calculate my roof size?

To calculate your roof size, measure the length and width of each section of the roof (including any overhangs), convert the measurements to the same unit (e.g., feet or meters), and then calculate the area of each section. Finally, sum up the areas of all sections to get the total roof size.

How do you measure a roof for free?

To measure a roof for free, you can use simple tools like a measuring tape, a protractor for pitch measurement, and a paper and pencil to record your measurements. Online roof measurement tools and apps may also provide free estimates based on satellite imagery, but they may not be as accurate as on-site measurements.

Is there an app to measure a roof?

Yes, there are several apps available that can help measure a roof using satellite imagery. Some popular ones include Hover, RoofSnap, and EagleView. These apps can provide estimates of roof measurements, but it’s essential to verify the accuracy of the measurements for precise roofing projects.

What is the biggest advantage of having a hip roof?

One of the biggest advantages of having a hip roof is its stability and resistance to wind. Hip roofs are less prone to wind uplift compared to gable roofs, making them a good choice for areas prone to high winds and hurricanes.

What are 3 advantages of a hip roof?

Three advantages of a hip roof are:

  1. Stability: Hip roofs are stable and less susceptible to wind damage due to their sloping sides on all sides.
  2. Aesthetics: They provide a pleasing and symmetrical appearance, making them a popular choice for various architectural styles.
  3. Effective Water Drainage: The sloping sides ensure efficient water runoff and reduce the risk of water pooling on the roof.

How much do roofers charge per square meter in the UK?

Roofing costs in the UK can vary significantly depending on the type of roofing material used, the complexity of the job, and the location. As of my last update in 2021, roofers in the UK might charge anywhere from £50 to £100 or more per square meter for standard roofing work. However, prices can fluctuate, so it’s essential to obtain quotes from local roofing contractors for accurate pricing.

What is the strongest roof for wind?

A hip roof is often considered one of the strongest roof designs for wind resistance. Its sloping sides and all-around symmetry help distribute wind loads evenly, reducing the risk of wind damage. Additionally, using sturdy construction materials and proper installation techniques enhance a roof’s strength in high winds.

What is the best roof shape for high winds?

The best roof shape for high winds often depends on the specific wind patterns in the area. Hip roofs, gable roofs with reinforced construction, and even some curved roof designs can provide good wind resistance. The key is to ensure that the roofing materials and construction techniques are appropriate for the local wind conditions.

What is the lowest roof pitch allowed?

The lowest roof pitch allowed can vary by region and roofing material. In some cases, a pitch as low as 1:12 (about 4.76 degrees) may be allowed for specific roofing materials designed for low-slope or flat roofs. Always check local building codes and manufacturer recommendations.

What is the best way to roof a low-pitch roof?

Low-pitch roofs require special roofing materials and techniques to prevent water infiltration. Options include built-up roofing (BUR), modified bitumen, single-ply membranes, and low-slope metal roofing. Proper installation and regular maintenance are crucial for the longevity of low-pitch roofs.

What roof tiles can go down to 10 degrees?

Roof tiles suitable for pitches as low as 10 degrees are often referred to as “low-pitch” or “low-slope” roofing tiles. These may include certain types of concrete tiles, clay tiles, or specialized low-pitch roofing tiles. Always check with the manufacturer’s recommendations for the specific product you intend to use.

What roof tiles are suitable for 15-degree pitch?

For a 15-degree pitch, you can use a variety of roofing materials, including asphalt shingles, concrete tiles, clay tiles, and metal roofing. It’s important to select roofing materials specifically designed for low-slope applications and to follow the manufacturer’s guidelines for installation.

How do roofers walk on steep roofs?

Roofers can walk on steep roofs safely by using specialized roofing shoes with slip-resistant soles and by employing safety harnesses or roof brackets. Proper training and safety equipment are crucial when working on steep roofs to prevent accidents and falls.

How steep is an 8-pitch roof?

An 8-pitch roof has a slope where the roof rises 8 inches vertically for every 12 inches of horizontal run. In degrees, this is approximately a 33.69-degree slope, which is considered moderately steep. Walking on such a roof can be challenging and may require safety precautions.

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