Rafters have a tendency to flatten under gravity thrusting outwards on the walls.
Traditional roof truss design.
When it comes to roof trusses you need to consider everything from design to cost to the pros of using trusses instead of stick framing a roof.
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The second step in building a roof truss is to prepare the materials needed.
As we will see below there are several different types of designs and this will impact the angles and designs of the overall truss.
The information herein is written as an informative guide to residential wood roof truss construction and to provide an understanding of the basic design criteria of wood trusses.
This reflects the weatherproofing requirements of older roofing materials like thatch and peg tiles.
In simple terms this type of roof consists of rafters and joists.
This decorative type of truss adds volume keeps the room cool and has a relatively low maintenance drywall.
2 variations available 24 6 12 residential truss.
Residential roof trusses as shown in figure a are an engineered configuration of wood members placed to hold the weight of the roof s finishing materials the internal structure s ceiling and any snow load that may occur.
A truss roof using factory made trusses which are delivered to site complete and just erected.
Not only is the volume large enough to convert into living space but the structure can generally be easily altered.
A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof.
The very first step for building roof trusses is to prepare a design layout that can be sketched by a professional architect or can also be done by using a software that is specifically meant to design a roof truss.
Pairs of opposing rafters were thus initially tied together by a horizontal tie.
A cut roof.
Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins.
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Current day building regulations require detailed calculation of the stresses timber size etc used in roof construction so factory made trusses are becoming the standard practice where all this can be worked out on a computer.
Traditional or cut roof.
The space between each truss is known as a bay.
The finished structure is readily adaptable.
The joists prevent the outward spread of the rafters walls and conveniently give support.
The traditional option is steeply pitched rarely less than 35.
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It s often used for cellars and long hallways.
For larger spans and thinner walls this can topple the walls.
In order to create the semi cylindrical appearance for the ceiling this truss would need many small pieces of wood framed together.
This has a characteristic barrel shaped ceiling.
