Bottom Chord Attic Connectors

Panel the chord segment defined by two adjacent joints.

Bottom chord attic connectors.

Mitek engineering design guidelines may 2020. The top or bottom chord. Truss top chords and webs not shown for clarity bottom chord lateral restraint and bracing with the tsbr and tbd22 use tsbr for both temporary and permanent bottom chord lateral restraint. The most common form by far is the fink illustrated below.

However he wanted 2x4 on the flat between the 2x6 to the next 2x8 over the top of the chord 2x4 for blocking too. And while this could be a blog topic in and of itself this post is instead going to focus on two other types of truss movements continue reading accommodating truss movement besides vertical deflection. When ceiling joists run perpendicular to the rafters inspectors may find rafter ties installed above ceiling joists as framing members every 4 feet running above the ceiling joists connecting opposing rafters. O no top chord splices in haunch of attic room as shown below.

Said okay to sister nail the bottom chords as long as the new joist had it s ends flat and secure on the wall plate and beam. Or less until the ceiling is installed. A rafter tie forms the bottom chord of a simple triangular roof truss. Attics o limit attic room bottom chord l d to max 23 for example attic truss with 2x10 bottom chord lumber in the room should not have room wider than 17 9.

Vertical deflection resulting from live and dead loads of both roof and floor framing components is an important serviceability consideration in the overall design of the building. Where 2x8 s were adjacent then 2x8 blocking was okay. Peak point on truss where the sloped top chords meet. Pitch inches of vertical rise for each 12 inches of horizontal run.

Deck is 1 2 ply and 5 8 firerock below. Splices are located at points of low stress usually at about a fifth of the bay length middle bay bottom chord upper bay on the top chord. Panel pointthe point where a web or webs intersect a chord. Once your truss is in place apply angle connectors to both sides of the bottom cord and install using simpson s 1 4 x1 5 strong drive screws.

Bottom chords must be laterally restrained during installation at 15 o c. Conclusion there are many good options to consider when determining how to attach your roof to the walls of the structure you re building. Plate a horizontal wood framing member typically the top and bottom 2x4 members of. This creates additional surface area for the two members to transfer forces and allows for them to be plated together creating a strong resilient joint.

On the outermost part of a bottom chord a small vertical cut known as a butt cut is created to give the truss a starting and ending point that can be aligned with the bearings below. Rafter ties should be at least 2 x 4 inches nominal.