Roof trusses and rafters

This type of roof structure will have the same structural layout as the plank floor structure, that is, a house building company บริษัทรับสร้างบ้าน will use the structural system as a beam supported by columns

The rafters may be supported by the following things:

  • Wooden poles, steel poles or concrete poles, main beams, poles made of wood or steel.
  • Concrete or construction materials.
  • The cross-section of such rafter support should be of sufficient size. so that the unit of compressive stress in the supporting material does not exceed the capacity of that support material
  • The distance between the rafters is equal to the length of the rafters. Typically 4″ to 8″ (1,220 to 2,440).
  • may use the span of the lath
  • The slatted roof may not have to hit the ceiling. by releasing the show under the belly of the lath
  • In addition to using hardwood as laths, other materials can also be used, such as
  • Plywood
  • Composite core material.
  • Sheet of cement roof
  • The length of the span of the rafters.
  • The depth of the rafters should be estimated as the following estimates:

– 15 crossbar length for hardwood rafters and the thickness is 1⁄3 to 1⁄2 of the depth.

– Cross length 20 for glued composite rafters and the thickness is 1⁄4 to 1⁄3 of the depth.

  • The size of the rafters depends on the weight of the roof. distance between rafters, span length and type of wood
  • Can protrude into an eaves not more than 1⁄4. of the length of the span across the rafters inside the building before filing
  • The structure of both the rafters and the wall columns. There is a need for the building to be supported horizontally or diagonally. to resist wind and earthquake forces
  • This type of roof structure usually does not hit the ceiling covering below. This is to show the lath. Therefore, we place a layer of insulation material and waterproofing sheet on top of the lath. Therefore, this type of wooden structure requires skillful construction.
  • Since the roof style cannot mask the conduit work, this should be taken into account.

rafter roof structure

Fixing the rafter structure for building a house รับสร้างบ้าน can be done in many ways. Generally, it depends on the placement. distance between rafters and the strength of the building body that must be placed across the rafters, etc.

  • rafters
  • Purlin and Kanose

The distance between the rafters is approximately 4′ to 8′ (1,220 to 2,440) using solid roofing or glued composites. while the ends of the rafters are supported by steel beams, columns, and concrete bearing walls. or building material

  • Purlin
  • rafters
  • Sheet or roofing material down the long way.

Another form of rafter beams that can be placed more spaced apart. with a patch to help support instead while placing the roofing sheet or roofing material on top

Purlin and canopy roof trusses

  • rafters
  • Purlin

The rafters are placed parallel to the inclined plane. with purlin and rafter beams which will follow perpendicular to the incline to serve as support for the rafters

  • purlin
  • Sheet or longitudinal roofing material.
  • rafters

If the distance between the purlins and the Kanoses are not very far apart We may hit the lath or the roofing material parallel to the inclined plane.

Fixing the beam to the column

rafters on chicken breast

  • For sloping roofs from 4: 12 and above, fix them with bolts, steel plates and washers.
  • For roofs with a slight slope, use steel plates to attach the rafter beams on both sides.

Connecting rafters to columns

  • rafters
  • Double-column rafters with anchors.
  • rafters for pillars
  • Building laws in some countries. May be specified to have a steel coupling to attach the column head to the rafter beam to prevent lifting forces due to wind loads.
  • Steel plate
  • Steel brackets on both sides.
  • Supporting stick/pole head
  • wooden posts
  • rafter beam with anchor
  • Support protruding from the wall.
  • Attachments may be bolts and retaining washers.
  • wooden rafter beams
  • Column with anchor
  • Anchors
  • The ends of the rafters may be cut obliquely for beauty.
  • Columns with anchors or columns attached to beams with center plates.

Picture of the roof cut at the roof ridge

  • Steel plates, bolts and washers. Fasten the head of the rafters together.
  • Lath on the rafter roof.
  • chicken breast
  • Rigid insulating sheets are laid over the waterproofing sheets.
  • The roofing material is placed over the top. and secured with bolts or hooks long enough to pass through the insulation layer to the bottom lath.

outside roof cutout

  • Close the gap completely.
  • Notched the beams so that the pillars can support the whole face of the pillars.
  • Under the roof background may not hit the ceiling.
  • eaves

Interior roof cutout

  • The gap between the ceiling and the roof. may be used as an area for installing insulation
  • Anchors may need to be placed on a steep slope to help support the purlin.
  • The pitch of the batten depends on the span of the roof background.
  • Install insulation on the roof floor or between the roof and the ceiling.

outside roof cutout

  • Critical depth of rafter beams
  • Close the gap completely.
  • The ends of the rafters may be cut obliquely for beauty.
  • Install insulation on the roof floor or between the roof and the ceiling.

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