It is a waterproofing layer made of regular felt stacked above the solid.
Roof framing section.
Building codes such as the icc s 2012 international building code section 2308 10 roof and ceiling framing typically specify that where rafter ties are used they are required at intervals ranging from 12 to 24 o c.
The primary object of a roof in any climate is protection from the elements.
Framing a roof is the last step in framing new construction.
Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult.
While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below.
Depending on the roof design and the roof rafter spacing.
Measure down y height from the long point of the rafter cut and make a mark.
Roofs are basically five types.
A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load.
Roof slope and rigidness are for shedding water and bearing any extra additional weight.
Shed gable hip gambrel and mansard.
Another common design in the northeast is the saltbox which is a gable roof with one longer side.
This will the first point of the rafter measurement line.