This makes the queen-post roof truss lighter than the king post roof truss. Purlins are provided on queen posts so that they aid in load transfer. The inner square formed by queen posts and straining beam can be braced diagonally to impart rigidity to the truss. This straining sill prevents the feet of the queen post from coming closer. A horizontal member called a straining beam connects the upper two ends of the queen posts and also holds them in position.Ī straining sill connecting the bottom of the queen posts is also laid over the main tie. The queen posts are placed at one-third distance from the support. These two vertical posts are called queen posts. Instead of one post at the center, the queen-post roof truss has two vertical members aligned horizontally across the span. As the span increases, the tie beam will experience sagging. This is a modified form of king-post roof truss. King post roof truss can be economically adapted for a span of 5-8 meter. Usability: Sheds, porch, garage, small houses, etc. Most of the time, a king post roof truss is made up of wood, or a combination of timber and steel can also be used. Here it forms a joint with the king post and the other strut. Struts connect the middle of the principal rafter to the middle of the main tie. To prevent this, inclined members called struts are provided. It also provides support to the main tie and prevents it from sagging.Īs this truss is provided for longer spans, there is a possibility that the principal rafter may bend from the middle. King post supports the ridge and holds both the principal rafters together at the ridge or apex at the top. The two common rafters spanning from the ridge to eaves are called principal (main) rafters. This central post is known as the king post. In this roof truss, a central post is introduced that joins the ridge point to the main tie. Read More: 11 Types of Wall Cladding: An Affordable Alternative to Pain t 9. King Post Roof King Post Roof Simple roof truss can be adopted for Span 6-9 m. It can be adopted for a span of about 4.8 metres. As the beam is raised, the height of the room is increased. The provision of a collar beam enables the roofing system to utilize the space economically. In collar tie roof, the tie beam that is provided at the leg of common rafters in coupled roof truss is raised above and it is known as the collar beam. It is a modified form of a close couple roof. It can be adopted for a span of about 4.2 meters or less. It also prevents the overturning of the walls on which the roofing system is supported. The provision of a tie beam prevents the common rafters from being spread outwards. It is named as closed couple roof as the tie-beam closes the couple roof structure. It is similar to the couple roof in structure except it has a tie beam joining the legs of the two common rafters near the support wall. This type of pitched roof provided for a span of up to 3.6 meters. In the middle, they intersect at a horizontal beam called a ridge. Then, roofing is provided leaning upwards towards each other. Here, both the walls on which the roof is to be supported are kept at the same level. It can support a span of 2.4 meters as it is supported only on a single side. Usability: Sheds, outhouses, and verandas attached to the main buildings.

Over these two unequal walls, roofing material is laid to obtain a lean-to roof. One of the walls over which the roof is to be supported is raised higher than the other wall. In this type of roof, the slope required for the pitched roof is provided by the wall itself. Other names: Pent roof or Aisle roof or Veranda roof Lean-to-Roof is the simplest form of the pitched roof in which slope is provided on a single side only. Read More: Gable roof detail – Its Types, Components, Pros, and Con s 4. The wooden truss supports a span of 3 meters. In the construction of roofs, different materials can be used for truss-like timber, steel, etc. A truss is a framed structure that carries a ridge piece and provides support to purlins.

But, if the span is much more or if the intermediate supports are not possible, then a truss is introduced. When the span is increased, the first solution is to introduce purlins or take support over partition walls. 10×10 Room Construction Cost Excel Sheet.Construction Material Testing Menu Toggle.

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Types of roofs with pictures