If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties.
Gable roof ceiling joist layout.
Joists tie into the roof rafters and some times need to be trimmed a bit to follow the slope of the roof.
This is a short description of three methods for installing ceiling joists beneath a hip roof where rafters near the wall line don t provide much room to work.
This is to let the common rafter fit in between later.
This video applies to gable.
Trusses also include reinforcing members between the top and bottom chords to add strength to the truss.
Learn a little more about how to frame and build a home or structure constructed out of wood lumber or even engineered lumber.
If you want a simple roof go for a gable.
Let s consider a basic gable wood roof framing design.
The image below shows a cross section of our simple 12 x 13 house from the joist span tablessection of this tutorial.
Here we have a wood framed gable roof.
The angles are basic and even the ceiling framing is a snap because it generally runs parallel to the rafters.
A structural ridge is the standard alternative to ceiling joists.
In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof.
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.
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.
Laying out your ceiling joist and figuring out whether you will but them over a wall or lap them.
Along the top center of the house there is a beam to which are attached 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.
Ceiling joist layout and gable roofs conventional house framing.
The picture below shows the ceiling joist starts 50mm away from the brickwork gable wall.
When constructing a gable roof the ceiling joists are laid out slightly differently.
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.
Remember to mark and cut your ceiling joists with their crown up.
Gable roof plate top layout.
