Bottom Chord Attic Connectors

Net section strength of bottom chord splice joints of mpc wood trusses.

Bottom chord attic connectors. The standard connectors gnq and gn16 are manufactured from galvanised steel. The horizontal beam of the triangle of a bottom chord is used in this simple triangle truss construction. Plate a horizontal wood framing member typically the top and bottom 2x4 members of. Standard repair detail for broken chords webs and damaged or missing chord splice plates 2x3 members.

Using ecojoist as the bottom chord increases the overall floor zone depth due to the requirement to rotate the top and bottom chords of the joist to match that of the remaining attic timbers. A triangle is the simplest form of a truss and the bottom chord is the base piece. The dead load on the bottom chord of a truss varies with the weight of materials attached to it such as drywall on. The bottom chord therefore carries combined stress of both tension and bending of the truss.

The joint configurations were 2x4 lumber with 20 gauge truss plates 2x6 lumber with 20 gauge truss plates and 2x6 lumber with 16 gauge truss plates. With the webs taken into account the overall depth of the bottom chord increases from 222mm to 353mm. Panel pointthe point where a web or webs intersect a chord. Peak point on truss where the sloped top chords meet.

The top or bottom chord. About the bottom chord. 1 5kpa to attic truss bottom chords low to extra high wind zones nzs 3604 as nzs 1170 references nzs 3603 nzs 3604 as nzs 1170 truss joints the gang nail connector plates are pressed into both sides at each joint. G n t e c h n i c a l i n f o r m a a t i o n.

If the bottom chord of a roof truss functions as a floor joist such as in an attic room it carries a live load that also varies by use but a typical live floor load for a residential space is about 40 pounds per square foot. Pitch inches of vertical rise for each 12 inches of horizontal run. I remember on one house he told me that you never ever ever ever cut a truss. Cutting the bottom chord of an attic truss i worked for an old school new england carpenter for a couple years when i was 15 16 years old.

Several common wood truss splice joint configurations were tested at varying levels of combined tension and bending loading. Conversely steeper roofs may allow for more than half the top chord pitch as in the truss shown above where the top chord pitch is 10 12 and the bottom chord pitch is 6 12.