At some point, whether a contractor or a home owner, you may need to order truss trusses. Regardless of whether a roof is used for a simple wooden shed or a complex elongated attic attic, it is helpful to know what information a farm designer may need.
Most likely, your assembly will be continued according to the architect’s drawings, and most of the parts you require will be listed there. In more complex cases, there may be technical specifications of engineers, providing data such as wind bindings and job loads.
A discussion of various types of roof construction is beyond the scope of this article and will hopefully be covered in subsequent publications. However, as part of the design process and discussion with your architect, you will encounter problems such as:
- Chassis or roof structure
- Vaulted or flat ceilings
- Using the attic space as living space (room in the roof)
Although this is by no means exhaustive, this article explains some of the terms you may encounter. It presents some ideas that you may need to think about before meeting with your farm designer.
1. Brief anatomy of a roof truss
You can imagine a simple common roof farm like a triangle; with two upper chords (rafters) of the same step, occurring on the top and connected on the basis of them by the lower chord (ceiling tie). This system of close ones is the main form from which most roof truss structures are developed.
Inside the farm, connecting the rafters and the ceiling tie together, there is a row of towels. These networks form triangular patterns that help distribute the forces inside the truss (triangulation of forces). The most common form of roof truss used for dwellings is the fika roof truss, which is recognized by a separate w-shape formed by its networks.
2. What is the total length of the roof truss?
Measured in millimeters, the total span of a roof truss is considered to be a span above wall panels. It is defined as the distance between the outer edges of the two supporting wall panels. They usually coincide with the building point of the truss where the lower sides of the rafter and the ceiling meet. Therefore, in most cases, the overall range is also the duration of the ceiling attachment.
3. What is the height / height of the truss?
The pitch of the roof truss is the angle formed by the rafters to the horizontal and is measured in degrees. Monopoly farms have only one line and, therefore, one step to consider (think of a right triangle). Conventional trusses, such as the Fink roof trusses, have a double pitch, usually with the same pitch on both sides.
There are circumstances in which you may need a two-story truss with different angles, either as a nuance to the design or where you fit the existing roofline.
If you cannot provide the height of the roof, the farm constructor can use the height of the truss. The height of the roof truss is defined as the vertical dimension from the top (top of the truss) to the bottom of the ceiling tie.
If you remember your high school, you can see the relationship between height and height.
4. What is a truss roof spacing?
In the UK, roof trusses are traditionally located at a distance of 400 or 600 millimeter centers. These measurements are in good agreement with those used on boards and panels for walls, which are 2400 x 1200 millimeters.
600 millimeters have become a popular step truss roof for timber frame buildings. This means that less roof trusses are required and represent significant savings. However, farms may require several large sections of wood and large nail plates. There is also the possibility of deflection in boots that support heavier roofing, such as natural slates, which may become apparent.
When using a roof covering such as a box-shaped profile or a light sheet covering, the distance between the slings can be increased in accordance with the manufacturers specifications.
5. What are the sheds, eaves and fascia details?
The overhang is an extension of the rafter (or ceiling tie) behind its support or support (wall plate). The frame is the area after the point at which the overhanging rafters passes the outer edge of the building. In many cases this will be the outer shell, and not the same as the load-bearing wall.
The canopy and the frame line provide the width for the soffit; board, fastened under the eaves to hide the logs.
The front panel platform is a horizontal board installed along the length of the building and attached to the end of the truss protrusions. The fascia itself is usually made of a plastic derivative, fixed against deterioration in the sun.
6. What is the function of the roof?
The obvious answer is that the roof provides a frame that supports the roof to protect the building. However, roof trusses do much more than that, and provide a number of other functions that you may need, including:
- Architectural aesthetics
- Integral functions (support for interior decoration of ceilings, etc.)
- Support services (water tanks, etc.)
- Support insulation, alternative energy
- Service Access
- Storage
- Rooftop
All of them are separate articles in their own right. Nevertheless, it is worthwhile to briefly discuss the concept of storage in the attic or attic rooms. You should carefully consider the amount of material that you accumulate in your roof space. If you have any special storage needs, you should mention this to your farm designer.
7. What is the load on the roof farm?
In addition to potential storage in the attic space, the farm designer must also take into account a number of other load factors. These include:
- tiled or slate loads
- Building location
- Wind load
- Snow
- Ceiling load
- Ceiling Covers
- Water tank loads
- Storage
- Attic Farm
- Floor loads
- Interior finish
- Storage
- Internal or external openings
Most of these loads are taken into account by the farm design software in the design process. When you provide your location, wind and snow can be automatically assigned. You may need to provide some information, a good example is the type of roof tile you are going to use.
8. Are there internal bearing walls?
The structure of the building or foundation shall determine the location of the external bearing walls and, therefore, the supporting points for the roof trusses. For certain types of trusses, especially attic trusses and hip ends, the position of any internal bearing walls can be affected. Very often, this additional support can reduce the size of the rafter and ceiling, as well as make difficult holes or spans possible.
9. Where are the internal holes?
Access to the roof space is vital, at least for servicing a loft is required. There are a number of other internal access factors that may need to be considered. In the case of a room in the roof, stairs will require attic rooms to be used frequently.
If the staircase passes at a right angle to the attic trusses, a much larger and potentially more expensive cut hole will be required. Cut holes require more trusses. At least doubling on either side of the hole (to form the beams) and providing supporting logs.
If access is required through one roof space to another, sometimes when the roof is rotated 90 degrees, then a passage is required (another hole cut).
10. Are there external holes?
There are several different types of external holes that break through the roofline. With the exception of the narrowest rooflights and chimneys that can shrink between trusses at 600 mm centers, all the holes will be beams and trim.
- Roof lights
- Dormer window
- Image windows
- Chimneys
11. Do you need processed roof trusses?
In the United Kingdom, it is not necessary to have wood roofed for new buildings. Since it is safe and inexpensive, and your roof is a major investment, you can consider it a worthwhile preventative step. Where farms are designed for old buildings and restoration work, this is almost certainly a good idea.
12. Delivery of your roof trusses?
Roof trusses can be extremely long and bulky with delivery containing a large amount of materials. You need to make sure that the roof truss manufacturer can access your site. If access is not possible, you need to make sure that you have the processing facilities to move the farms from the available delivery point to your site.
On site you need to make sure that you have storage space for the farm. You may also need to lift the trusses on site, using a crane or a telescopic lift.
