Just remember the acronym: FIS. This stands for Feet, Inches, Sixteenths. So, for example, a dimension string that reads; 4-7-12 would be the dimension 4′-7 12/16” or 4′-7 3/4”.

Table of Contents

## How do you read a truss spec sheet?

Just remember the acronym: FIS. This stands for Feet, Inches, Sixteenths. So, for example, a dimension string that reads; 4-7-12 would be the dimension 4′-7 12/16” or 4′-7 3/4”.

**What is a truss PDF?**

A truss is a structure composed of slender members joined together at their end points; • Each member only takes axial forces. Page 3. Application.

### What size are roof trusses?

While truss spans can reach up to 60 feet, rafter spans usually can only reach to about 30 feet. Also, the webbing of truss roofs provides excellent structural strength. They’re DIY friendly – Trusses are easier to build yourself than rafters.

**What is a truss PPT?**

Truss is a framework, typically consisting of rafters, posts, and struts, supporting a roof, bridge, or other structure. a truss is a structure that “consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object” Read more.

## What are the 3 types of trusses?

Common types of roof truss

- King Post truss. A king post truss is typically used for short spans.
- Queen Post truss. A queen post truss is typically a vertical upright with two triangles either side.
- Fink truss.
- Double Pitch Profile truss.
- Mono Pitch Truss.
- Scissor Truss (also known as Vaulted Truss)
- Raised Tie Truss.

**How are trusses calculated?**

How do I calculate roof trusses? The simplest form of this equation is to take the length of your roof and divide it by 2. For example, if your roof is 40-feet long, it will need a total of 20 trusses.

### How is truss load calculated?

Multiply the Span by the Height to calculate the area: 24ft x 4ft = 96 sq-ft. area. Multiply that by the weight of our material (2psf), and we get a total weight of 192 lbs. This is the total weight of all the material to be added to the face of the truss.

**Are roof trusses 2×4 or 2×6?**

Trusses only use 2×4 lumber and are constructed using a “web” of 2x4s for strength. Rafters simply rely on a center ridge beam and the outside walls for support. While there are benefits to both, only rafters vary in the size of lumber that is used.

## What are basic components of a roof truss?

The Basic Components of a Roof Truss

- Apex – Highest point where the sloping top chords meet.
- Bearing – Structural support of trusses (usually walls) normally with a timber wall plate.
- Bottom Chords (BC) – the lowest longitudinal member of a truss.
- Cantilever – part of structural member that extends beyond its support.

**What is truss design?**

In engineering, a truss is a structure that “consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object”. A “two-force member” is a structural component where force is applied to only two points.

### What is steel roof truss?

What is steel roof truss? A steel roof truss is essentially a triangulated system of straight interconnected structural elements. The individual elements are joined at the nodes by welding. The external forces applied to the system and the reactions at the supports are generally applied at the nodes.