L I M K O K W I N G I N S T I T U T E S C O L L E G E O F C R E A T I V E T E C H N O L O G Y...

L I M K O K W I N G I N S T I T U T E S C O L L E G E O F C R E A T I V E T E C H N O L O G Y

Faculty of Architecture and the Built EnvironmentBuilding Construction 1Semester 1 ______________________________________________________________________________________________________ ROOF STYLES

COMMON ROOF STYLES

Roof styles are an important feature of the building of a residental home. Everyone from the designer to the builder to the consumer can benefit from the basic knowledge of roof styles.

Flat Roof- A single plane that is pitched at a low angle to shed water

Salt Box Roof- Shed roof built

onto a gable roof at the same pitch and width


Faculty of Architecture and the Built EnvironmentBuilding Construction 1Semester 1 ______________________________________________________________________________________________________

Hip Roof- A a gable roof with the ends brought together at the same pitch as the rest of the roof.

Gable Roof- Two pitched roofs, back to back, forming a triangular roof

Kicked Eaves Roof- An roof enhancement where the plane near the eaves is "kicked" to give a visor effect

Gambrel Roof- A gable type roof with breaks in the planes



Mansard Roof- A double planed hip roof

Pyramid Roof- A hip roof built on a square base with eaves of the same length



Cross Gable Roof- Pairs of gable roofs

set at right angles to each other

Conical roof- A triangle rotated through itself



Hip On Gable Roof- A partial hip applied to the peak of a gable roof

Hip and Gable Roof- A combination of hip and gable where the hip ends partially up the gable

Shed Roof- A roof that starts at the eaves of the existing roof and continues at a lower pitch

Hip Roof With Cross Gables- A central hip with crossing gables



Try to identify these photographs of various roof styles.

•Hip •Gable •Mansard •Pyramid

•Cross Gables •Pyramid •Conical •Gambrel

•Kicked eaves •Hip •Pyramid •Shed

•Hip on gable •Hip •Mansard •Hip and gable



•Saltbox •Flat •Gable •Gambrel

•Saltbox •Gable •Hip and gable •Cross gables

•Conical •Pyramid •Mansard •Hip

•Hip on gable •Mansard •Hip with cross gables •Hip and gable

•Cross gables •Saltbox •Mansard •Shed

•Hip and gable •Hip on gable •Cross gables •Hip roof with cross gables



•Cross gables •Mansard •Kicked eaves •Hip and gable

•Conical •Mansard •Kicked eaves •Pyramid

•Mansard •Conical •Hip •Hip roof with cross gables

•Gable •Shed •Flat •Gambrel



ROOF LOADS

Live LoadsAny load which is not of permanent nature, such as

snow,wind, movable concentrated loads, furniture, etc.Live loads are generally of short duration.

Dead Loads Permanent loads that are constant on the truss or rafter,

e.g.; the weight of the truss itself, purlins, sheathing, roofing, ceiling



ROOF SLOPE


Faculty of Architecture and the Built EnvironmentBuilding Construction 1Semester 1 ______________________________________________________________________________________________________ SLOPE & PITCH Span Distance between outside edges of the double plates.

Run ½ of span distance

Rise Vertical distance from the top of the double top plate to the middle of rafter at ridge

Unit Rise Number of inches that a roof rises for every 1 foot

Slope Ratio of Rise to Run (4/12) Inches of vertical rise per running foot.

Pitch The ratio of the Rise, in feet, to the Span, in feet.



Non-supporting Ridge Board Ridge board is non structural simply keeps rafters straight

Opposing rafters act like an arch, forces transferred to walls.Ceiling joists required to prevent outward "Thrust".



Structural Ridge Beam Supports upper rafter ends so roof functions as 2 sheds

Must span between vertical supports at end walls

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