Attic Trusses And Rafter Ties

Moving the rafter ties up only 16 inches from the plate the maximum allowed by code increases the tie force from 1 440 pounds to 2 160 pounds. Instead of attaching the tie to the rafter you will be attaching it to the bottom chord of the truss. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams.

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Attic trusses and rafter ties.

Simpson strong tie category roof truss and rafter connectors ties and straps for cold formed steel construction. Installation is the same for trusses as for rafters see above. Simpson strong tie 5 2 7 in 18 gauge triple zinc steel rafter tie. For pricing and availability.

Rafter ties are required by code unless the house is designed so that the walls or a structural ridge beam carries the full load of the roof. In this example when w 960 the tie force tension at the plate when there are rafters 24 inches on center with a 4 12 pitch and a 12 foot span is 1 440 pounds. Collar ties are usually placed in the attic area of homes. Collar ties are necessary to prevent separation of the roof at the ridge due to wind uplift.

The prescriptive provisions of the building code require rafter ties on each rafter pair and collar ties every 4. For pricing and availability. They are secured about three quarters of the way up the roof rafters. Check the attic so that you can get a better look at where the roof rafter collar ties will be installed.

Some of these can support the roof and prevent ridge sagging and wall spreading. Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie. An engineer can design a roof with rafter ties on wider spacings look at the ridge and or wall plate as a beam if doing that. Rafter ties resist the forces caused by gravity loads that would otherwise cause the roof to pancake and push out the sidewalls.

Hurricane ties offer a strong connection that will provide you with the strongest resistance against uplift. Measure the distance between adjacent roof rafters so that you will know the amount of lumber to purchase. Click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list compare click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to the compare list add to list click to add item 26 spreadweb residential roof truss 5 12 pitch 87 to your list.

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