PINE
Souther yellow pine #2 & better.
There is only one common framing distance in framing square. The most common framing square is called steel square.
There is only one common framing distance in a framing square. The main framing distance in a framing square is a steel square.
There are different sizes when framing lumber. The most common size of framing lumber is 2 by 4.
The three most common importance areImproves VisualPreserve for long periodProtection from surroundingFor all such factor framing is very important for Artwork.
There are four different types of framing lumber. The common framing lumber are Spruce-Pine-Fir, Structural Southern Yellow Pine, Machine Stress Rated Lumber, Treated Southern Yellow Pine #2 and Better, and Bluwood.
Most parts of a house can be made from timber, if the type of timber is appropriate. For example: types of timber that are resistant to rot from damp conditions can be used for foundations or roofing.Timber cannot be used for glazing, or to provide a completely damp-proof layer, but can be used for:shutters;doors;cladding;structural framing;foundations and piles;wall and ceiling lining;flooring;roofing; andwindow frames.
No, I would assume they are the most common. Unless you are talking about a flat roof.
Most probably did. Some were built of stone, without framing, and some were log cabins. Medieval wattle and daub houses had timber frames, as did the other half timbered houses, cruck houses, and so on. There were brick houses in the Middle Ages, but I don't know anything about how they were built.
In most cases 2 ft.
No. Most timber is for internal consumption.
There are many places one might go to find more information concerning roof trusses. The most reputable source of information might be the local library.