Continuing on from part 3.
House roof joists.
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Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
It s often used for sheds garages or extension of an existing roof.
Let s consider a basic gable wood roof framing design.
The roof rafters provide integral structural support to the roof.
This flexible insulation material is most often packaged in rolls that come in various thicknesses and standard widths usually 16 inches and 24 inches to fit between joists or studs in a house s framing.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
A fascia board which is a roofing material that helps compensate when there are inevitable inconsistencies in rafter length will mount on the front and on the sides of your porch roof frame.
A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper.
Frame your porch roof by continually adding rafters until it extends one foot past your porch walls or support columns.
They come with or without a paper or foil facing that acts as a vapor barrier.
If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.
Also different architectural styles will use the same type of roof.
A stick framed house used 20 643 board feet of lumber while a component framed house including roof trusses used only 15 052 board feet of lumber.
After that to make it flush with the roof of the existing house cut the two outer rafters.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
A mono truss is a one sloped truss that forms a right angle triangle.
Types of mono trusses 1.
Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss.
Here we have a wood framed gable roof.
