Moving Roof Collar Ties

Collar ties are the appendix of roof framing an evolutionary dead end in home building hanging on by just a couple of nail points.

Moving roof collar ties. There are collar ties the 1 x 1 5 horizontal beams you can see in the photos nailed in roughly. The 2015 international residential code does not require collar ties or collar beams. In general leaving every third joist or collar tie intact will provide adequate support for the roof load and the ties in between can be removed. It currently has 1x6 collar ties on every roof rafter which are about 20 apart.

Doubling the remaining ties by installing one on each side of the rafter provides some extra strength and is more aesthetically balanced. The idea is to put in new collar ties that would double as ceiling joists there will also be knee walls at 5 high per code. The only time collar ties do any good is when they are specifically designed to be functional by an engineer or architect and are installed with meticulous care by the framer according to detailed drawings. The upper collar tie does not experience the tension that the lower rafter tie is resisting if that tension is resisted in the upper third the roof is probably on the ground.

The prescriptive provisions of the building code require rafter ties on each rafter pair and collar ties every 4. I have recently had the roofing redone which involved removing all the old layers first so the roof is now a lot lighter than it used to be. A collar tie is a tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge beam during periods of unbalanced loads such as that caused by wind uplift or unbalanced roof loads from snow. Some of these can support the roof and prevent ridge sagging and wall spreading.

I am putting some flooring 5m x 3m in the roof space and the collar ties are at about waist height making moving about quite difficult. It has a front gabled roof that is constructed of 2x6 s real 2x6 s not 2x5 5 s and planked sheathing underneath a slate roof. Moving collar ties barry white gave me a great link to study the terminology so i m not asking about thingy me bobs and whosiwhatsits. 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.

Collar ties rafter ties tension beams structural ridge beams.