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Steel Roof Trusses
Hrishi Desai
0813
Introduction
Residential metal roofing is primarily
made of Steel or Aluminium. !
!
Copper, zinc and titanium are also used...
Most building roofs can be framed
with engineered light-gauge steel
trusses which are manufactured
from C-Shaped metal stu...
Truss
A standard truss is a series of triangles : a stable geometric shape
that is difficult to distort under load. Regardl...
Text
Roof truss strength derives from the triangle shapes that
comprise the truss itself. Triangles are naturally rigid
geometr...
Text
Example of a Truss
Specifying a Truss
Trusses are manufactured from C-Shaped Galvanised steel. The strength of
each member derives from its g...
Text
C Shaped
Galvanised Steel
Loads acting on
A Truss
Construction Process
As with any structural
member, a faulty design will
undermine even the most
professional of installat...
The roof truss will have a
horizontal lower chord,
and 2 angled upper
chords that follow the roof
line. These chords will ...
Lay the truss members
out on the ground
Once all the chord and
web members are cut to
size, arrange them flat on
the ground...
After the truss is been bolted
up, it is lifted and placed as
per the plan.
And this way, one by one,
after placing them a...
Protection (Metallic Coating)
All Steel Roofing has a protective barrier on both sides of the sheet
called a metallic coati...
Hrishi Desai

0813
Thank You!
Steel Roof Truss
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Steel Roof Truss

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In & Out of Steel Roofing

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Steel Roof Truss

  1. 1. Steel Roof Trusses Hrishi Desai 0813
  2. 2. Introduction Residential metal roofing is primarily made of Steel or Aluminium. ! ! Copper, zinc and titanium are also used in specialised architectural applications for homes.! ! Steel roofing for residential applications is very lightweight with the heaviest product weighing about 1.5 pounds per square foot when installed. The products are initially produced in giant rolls at the steel mills.
  3. 3. Most building roofs can be framed with engineered light-gauge steel trusses which are manufactured from C-Shaped metal studs. Prefabricated steel trusses offer a high-strength, light-weight roof system that can be installed quickly. In residential construction, wood trusses still dominate the industry, however light gauge steel roof systems are gaining ground in markets where additional strength is needed, or where greater free spans are required.
  4. 4. Truss A standard truss is a series of triangles : a stable geometric shape that is difficult to distort under load. Regardless of its overall size and shape, all the chords and webs of a truss form triangles. These triangles combine to distribute the load across each of the other members, resulting in a light structure that is stronger than the sum of the strength of its individual components. ! Some of the Steel roof Trusses generally used are - King post, Queen post, Fink, Howe, Pratt, Warren, Fan and North Light. ! !
  5. 5. Text
  6. 6. Roof truss strength derives from the triangle shapes that comprise the truss itself. Triangles are naturally rigid geometric shapes that resist distortion. Top chords are in compression and push out at the heel and down at the peak. The bottom chord is normally in tension to resist outward thrust. The webs form smaller triangles that strengthen the overall structure and provide rigidity. Loads on the individual webs can be either compression or tension, depending on the type of load.
  7. 7. Text Example of a Truss
  8. 8. Specifying a Truss Trusses are manufactured from C-Shaped Galvanised steel. The strength of each member derives from its geometry, rather than weight. When specifying a roof system with a truss manufacturer, the builder/developer should include the span of the roof, the pitch, the top-chord overhang, the end cut and soffit return details needed, and any gable-end preferences. Typical stresses in a roof system show some members under compression and others under tension. When specifying a truss to a manufacturer, there are a number of items the building designers need to provide. Most truss manufacturers will provide the building designer with a checklist that describes the details needed to initiate a truss design. Those details are summarised below.
  9. 9. Text C Shaped Galvanised Steel Loads acting on A Truss
  10. 10. Construction Process As with any structural member, a faulty design will undermine even the most professional of installations. Your roof truss will need to be able to handle the expected dead loads and live loads on your structure's roof. The truss will also need to be supported adequately at its ends.
  11. 11. The roof truss will have a horizontal lower chord, and 2 angled upper chords that follow the roof line. These chords will be connected by "web" members, which will be oriented to form triangles. Your design should call for the same size lumber for each member. Web Upper Chord Lower Chord
  12. 12. Lay the truss members out on the ground Once all the chord and web members are cut to size, arrange them flat on the ground in the shape of the truss. And there after, they are bolted or joined by welding.
  13. 13. After the truss is been bolted up, it is lifted and placed as per the plan. And this way, one by one, after placing them all, the structure is ready. At last, this is followed by covering the top with the material according to the use.
  14. 14. Protection (Metallic Coating) All Steel Roofing has a protective barrier on both sides of the sheet called a metallic coating which protects against rusting. This is underneath and separate from any paint which imparts colour to the product. There are two types of metallic coatings used: Galvanised : This is 100% Zinc in various thicknesses depending upon the product usage. Galvalume or Zincalume : A mixture of aluminium and zinc. (55 percent by volume aluminium) Metallic coatings "sacrifice" themselves to protect the Iron (Fe) in steel from oxidation when exposed to the air and moisture is present.
  15. 15. Hrishi Desai 0813 Thank You!

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