A purlin is used to support the rafters between the plate and the ridge of a roof. A purlin is a horizontal or longitudinal member in a roof frame.
There are several different types of purlins used in roof construction. An under purlin sits on the principal rafter of a truss or is propped off a wall to support the rafters. This type of purlin allows a longer span than the rafters alone are capable of spanning. An over purlin sits on the rafters or on a truss or a steel member to which the roofing material is directly attached. There are also several categories of purlins used in wood construction, including through purlins that pass over the top of the principal rafters and butt purlins that tenon into the sides of the principal rafters.Learn More
To cut the rafters for a hip roof, or a roof with inclined ends, measure out the angles, cut, drop the hip, and cut the tail. Cutting a hip roof takes roughly half a day and requires a band saw, boards for the rafters, a speed square, a tape measure and a pencil.Full Answer >
More than 20,000 workers and 1,000 elephants were used in the construction of the Taj Mahal. Construction of the Taj Mahal began in 1632 and took 20 years to complete. Workers came from India, Persia, Europe and the Ottoman Empire. The Taj Mahal is a mausoleum made from white marble.Full Answer >
The Empire State Building is used for many things including office locations and as a popular tourist attraction. It stands 1,454 feet high and was built in 1931.Full Answer >
Materials used to construct the Eiffel Tower include wrought iron, steel and paint. Wrought iron forms the majority of the tower structure while steel provides additional support and paint adds aesthetic appeal along with protection from corrosion.Full Answer >