Steel roof trusses are frame structures made of straight members arranged in triangular configurations to form a plane. They are commonly used for industrial sheds, large rooms, auditoriums, and warehouses. There are different types of steel roof trusses including king post, pratt, queen post, fan, howe, north light, quadranglar, parallel chord, scissor, and raised heel trusses. Each type has different characteristics that make it suitable for different span lengths and building needs.

1. STEEL ROOF TRUSSES
UJJWAL SINGH

2. INTRODUCTION
STEEL ROOF TRUSSES
:- A frame structure in which separate straight member are so arranged and
connected at their end that the member form a triangle which lies in the
same plane.
:- Normally it is provided for more than 6 m.
1. Industrial shed.
2. Ceiling for large room.
3. Auditorium ,Cinema hall, marriage hall ,godowns etc.
• The Member carrying compressive forces in roof truss is know as struts.
• The member carrying trnsile forces in roof truss is know as tie member.

3. STEEL ROOF TRUSSES

4. Components of roof truss
STEEL ROOF TRUSSES
:- The member of roof truss classified into two category.
1. Main Member Carrying load and distribution the applied load , provide
the stability.
2. Secondary Member provide the stability to the primary member.

5. STEEL ROOF TRUSSES
Types of steel roof trusses
1. KING POST TRUSS
2. PRATT TRUSS
3. QUEEN POST TRUSS
4. HOWE TRUSS
5. FAN TRUSS
6. NORTH LIGHT ROOF TRUSS
7. QUADRANGULAR ROOF TRUSSES
8. PARALLEL CHORD ROOF TRUSS
9. SCISSOR ROOF TRUSS
10. RAISED HEEL ROOF TRUSS
:- A Roof truss is basically a structure that includes one or multiple triangular
units that includes straight slender members with their ends connected via
nodes.

6. STEEL ROOF TRUSSES
KING POST TRUSS
:- This particular truss is made out of wood most of the time,
but it can also be built out of a combination of steel and wood.
It all comes down to the architect and the building structure.
The King Post Truss spans up to 8m, which makes it perfect
for multiple types of houses, especially the smaller ones.

7. STEEL ROOF TRUSSES
PRATT TRUSS
:- This is one of the most popular steel roof truss types and it is
quite economical. This particular type of truss offers some
interesting features mainly thanks to the fact that the vertical
members provide tension, while the diagonal ones are bringing in
compression. It’s important to note that these trusses can be used
for spans that range between 6-10m.

8. STEEL ROOF TRUSSES
FAN TRUSS
:- Just like you see from many roof truss types
pictures, the Fan Truss comes with a vercany
simple design and it’s made out of steel. In this
particular situation, the trusses form a fink roof
truss.
On top of that, the main characteristic here is that
the top chords are split into smaller lengths, as this
allows the build to obtain purlin support. Also, you
get a medium span with this type, around 10-15m,
which is more than enough for most projects.

9. STEEL ROOF TRUSSES
HOWE TRUSS
:- This type of truss is a combination of steel and wood,
which makes it elegant, while also offering a very
appealing design. Almost everything is made out of
wood, however, the tension members or the vertical
members are manufactured out of steel in order to offer
extra support and reliability!

10. STEEL ROOF TRUSSES
QUEEN POST TRUSS
:- The Queen Post Truss is designed to be a very reliable,
simple and versatile type of roof truss that you can use at
any given time. It offers a good span, around 10m, and it
has a simple design which makes it perfect for a wide
range of establishments.

11. NORTH LIGHT ROOF TRUSS
STEEL ROOF TRUSSES
:- The North Light Roof Truss is
suitable for the larger spans that go
over 20m and get up to 30m. This
happens because it’s cheaper to
add a truss that has a wide, larger
set of lattice girders that include
support trusses.
This method is one of the oldest, as
well as most economical ones that
you can find on the market, as it
allows you to bring in proper
ventilation. Plus, the roof has more
resistance too because of tha

12. QUADRANGULAR ROOF TRUSSES
STEEL ROOF TRUSSES
:- These are used for large spans, and this
is why you can encounter then in larger
spaces, which include auditoriums or even
railway sheds

13. PARALLEL CHORD ROOF TRUSS
STEEL ROOF TRUSSES
These are made out of wood and the best part about using
them is that they don’t require any beam nor bearing wall.
Instead, they opt for full pieces of wood and thus lower the
amount of labor necessary for working with them. It does
require more space in the attic and the span might not be the
best, but the price might justify opting for it if you are on a
budget.

14. SCISSOR ROOF TRUSS
STEEL ROOF TRUSSES
:- A Scissor Roof Truss can particularly be found in
cathedrals. It doesn’t require beams or bearing walls,
however it doesn’t leave that much space for insulation
which makes its energy efficiency very poor.
On the other hand, the upside here is that the ceiling gets
vaulted and you receive more space in the attic.

15. RAISED HEEL ROOF TRUSS
STEEL ROOF TRUSSES
This is one of the most efficient types of timber roof trusses, mostly
because it brings a very good room for insulation, but at the same
time it also provides you with a very good system for structural
support.
It might require some additional materials in order to make it
bring the best results, not to mention that the costs can be a little
higher when compared to other truss types, but it does help you
lower the energy bill value, so keep that in mind

16. Interior view
STEEL ROOF TRUSSES