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The same thing is true for the bridge of the truss. Demolition and gutting of a building to make way for a new establishment. Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.Top Plate: The horizontal beam that supports the roof by supporting the rafters to the wall studs.

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Why is my roof sheathing sagging between the trusses?.

How much of a roof truss can I cut out to make a storage platform in the attic?.

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Are roof trusses better than roof rafters (stick framing)?.

Here’s links to a collection of our blog posts about ROOF TRUSSES: Repairs should not be attempted without proper repair detail drawings.' When you notify the truss manufacturer, they in turn will notify their engineer who will prepare the repair drawings if necessary. The truss chord with the drilled holes may have been designed near capacity and any reductions from drilled holes could affect the structural performance of the truss. The manufacturer will be better suited to discuss whether or not a repair is necessary, because they know the loads for which the truss was designed. If you have trusses that have already been drilled and you are concerned about the holes, here’s what the Structural Building Components Association (SBCA), a manufacturer’s group, recommends: 'Contact the truss manufacturer if you are concerned about the serviceability of your truss. Plus, some members are more heavily loaded than others. But trusses are more complicated, with the loads zig-zagging and flipping around as they run through the webs and chords. So it’s easy to define the safe places to drill.

The main reason why holes are allowed in joists and rafters, but not trusses, is that joists and rafters have specific areas that are in tension, compression, or neutral. ”T russ members shall not be cut, notched, drilled, spliced or otherwise altered in any way without the approval of a registered design professional,” according to the International Residential Code (IRC R802.10.4). A truss cannot be drilled without authorization of a licensed professional engineer or the truss manufacturer. Although the code allows drill holes in roof joists and rafters, with a limit on size and location of the holes, trusses are a different animal.

Roof truss repair detail