Gambrel roof: the main design rules

main features hipped roof

Design gambrel roof has two sides:

1. The longest slopes have a trapezoid shape
2. Shorter - triangle.

basis hip roof - a rafter.They can be:

• Central
• diagonal corners or external

Long-term exploitation of the roof and reliable protection at home from strong wind gusts and heavy rainfall depends on the angle of inclination.In turn, the bevel directly proportional to the local climate.Before the start of roof construction needs to know about:

• Rainfall
• Force
• airflow Building material roofing system installation

The above figures indicate, at what height and angle of the roof can be oriented developers.

important to note!Independence in the calculation of hipped roof is welcome in case of installation specialist.In the other points need careful consultation with a professional.You can calculate the area of ​​the hip roof in a computer program for designing construction projects.

Projecting roof system hipped roof

The above image shows the design gambrel roof structure chetyrehgrannost.Standard ramps modified second pair of skates, making the design more functional and aesthetic.

Diagram of hip roof is marking the rack, using the Pythagorean theorem.

Design involves the implementation of the rules:

1. intermediate components have a steeper slope.Their installation involves the use of boards 5/15 centimeters
2. Short parts are screwed to the corners of the rafters, not to the ridge elements
3. better to use the same materials for the frame and the ridge detail
4. central rafters are mounted to the ends of the ridge board
5. central rafters should be tightly pressed against theridge board and attached to the upper end of the strapping

example in the photo.

Classification pyramidal hipped roofs

Distinguish:

• hipped roof - has four uniform in design ramps, same angles
• poluvalmovaya - hip length does not reach the edges of the roof, covering the upper half of the sloperoof
• Bent - different ramps, different lengths.Its design - a very laborious process.

instructions on designing a hipped roof

basic principle when installing a gambrel roof - to know the rules of calculation of its area and not to neglect the advice of professionals.

Some principles:

• main supporting structure is a strong point, it should be at the center of the roof structure.
• diagonal rafters take care of all the wind loads.The diagonal rafters should be made from dense, thick boards, one end must be built into the skate, the second - to go beyond the boundaries of the house.
• central frame located on the edges of the ridge, overlooking the walls.
• intermediate frame mounted on the grounds slope.
• rather short rafters are mounted at the same angle.

Additional points:

1. Before construction hipped roof, should make a layout from the end axis of the house.
2. then determined by the width of the ridge board and placing the basic element in the rafter system.
3. to the removal line to attach one end of the rail gage, the second - on the side line of the wall, the location of the intermediate rafters.
4. rafter overhang length - the length of the end of the bar on the roof overhang and the length of the beam at the outer corner of the wall.

more complete visual introduction, watch the video in the next tab:

formula for calculating the gambrel roof plan

We act according to the scheme:

• The design of the intermediate rafters determined by gauging the rack.According to the data table is the result and select the slope of the roof.
• Determine the length of the rafters by fixing the support to the ridge board.
• The same scheme measures the length of the eaves.It is advisable to use the formula of the Pythagorean theorem: the square of the hypotenuse is equal to the sum of the squares of the legs.

Measurement rafters made under the scheme:

1. measured rafters
2. result obtained by the formula of Pythagoras can be used as a value
3. projection obtained multiplies the numbers on the correction factor.These are long and angular rafters

Detailed look at the video in the next tab: