Joists tie into the roof rafters and some times need to be trimmed a bit to follow the slope of the roof.
Gable roof ceiling joist layout.
Depending on the building design finished ceiling surfaces may be affixed to a ceiling joist at the bottom of the roof triangle giving a flat ceiling between the opposing building walls or the ceiling may be affixed partly to the under side of rafters and partly to the under side of rafter ties giving a cape cod type ceiling design.
This video applies to gable.
Learn a little more about how to frame and build a home or structure constructed out of wood lumber or even engineered lumber.
Remember to mark and cut your ceiling joists with their crown up.
If you want a simple roof go for a gable.
Truss design spacing engineered roof trusses are carefully designed structural assemblies that include roof rafters which in truss designs are called top chords and ceiling joists which are called bottom chords in one pre fabricated unit.
This is to let the common rafter fit in between later.
Gable roof plate top layout.
If you are using 2 8 joists and 2 6 rafters for example the joist ends need to be clipped as shown in the drawing above.
Trusses also include reinforcing members between the top and bottom chords to add strength to the truss.
Use a 2 6 for the first ceiling joist laying it flat on the end wall.
A structural ridge is the standard alternative to ceiling joists.
If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties.
The image below shows a cross section of our simple 12 x 13 house from the joist span tablessection of this tutorial.
In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof.
Carpenters contractors and do it yourselfers can usually educate themselves with on the job training but what would it hurt to watch a few videos or examine a few pictures about different methods and techniques before working on your next project get some great.
The angles are basic and even the ceiling framing is a snap because it generally runs parallel to the rafters.
Rafter ties or ceiling joists acting as 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.
Here we have a wood framed gable roof.
Otherwise they ll stick up above the slope of the roof.
Along the top center of the house there is a beam to which are attached the rafters.
Let s consider a basic gable wood roof framing design.
The picture below shows the ceiling joist starts 50mm away from the brickwork gable wall.
Ceiling joist layout and gable roofs conventional house framing.
