house plans

How Roof Trusses work with Pre-Designed House Plans

Have you ever wondered how the various components of a new home are made? Roof trusses are particularly important because of the loads that they’re expected to bear. We will walk you through the truss design and manufacturing process so that you can better understand the engineering that goes into a completed home.

How Trusses work with Pre-Designed House Plans

House plans that include a trussed roof generally , there are too many variables for designers to be able to give specific information on the trusses that will be required. The location your home will be built plays a large part in the truss design. Wind, seismic and snow loads all need to be taken into account and those loads carried through the structure.

Work with your Truss Company

The truss manufacturer will will gather information from you, such as site location, and your roof finish materials. They will use that information to decide what design criteria, live, and dead loads the roof needs to be designed to. Live loads include things like snow or movable things within the structure (attic storage), while the dead load is the weight of the building materials that the home is made from (ceiling material, roof finish materials).

The Engineering Process

With the layout information provided from your house plans, along with the site specific design criteria mentioned earlier, the manufacturer engineers roof trusses that can support both live and dead loads needed. The truss manufacturer will use the plans and designed load bearing points as a guide, but ultimately the manufacturer’s design will determine where there will need to be supporting structure beneath the roof. This information should be compared to the house plan structural design.

Finalizing your Construction Documents

Once the truss design is complete, the loads from trusses should be compared to the supporting structure in your house plans, and the structure should be adjusted as needed. With Mascord house plans, structure is calculated using truss loads from "best guess" wind and seismic values given to a truss manufacturer, to create a structural design that works in most cases. Many other house plan publishers do not include structural details at all, and leave you to have all the beams and posts calculated for the entire home.

It’s important to remember that the structural load of a home starts with the roof, and each point load from supporting structure needs to be carried through the home to the foundation, which then needs designing to support those loads. You can't ignore a changed truss design.

To help in this matter, we offer our clients a free truss review, where our designers will compare your specific truss design to the house plans structure, and recommend changes if needed.

For more information, contact a reputable truss manufacturer such as Builders First Source.

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