Other Types of Roof Framing
A dormer is a framed structure that projects out from a sloped roof.
A dormer provides additional space and is often used in a Cape Cod-style home -- a single-storey dwelling in which the attic is often used for sleeping rooms.
A shed dormer is a good way to obtain a large amount of additional living space. If it is added to the rear of the house, it can be done without affecting the appearance of the house from the front.
A gable dormer serves as an attractive addition to a house, in addition to providing a little extra space as well as some light and ventilation.
b) Plank-and-Beam Framing:
Plank-and-beam framing, also known as post-and-beam framing, employs much sturdier framing members than common framing.
This type of construction is mostly used for new home construction.
It is used in colder climates more than warmer climates because you have the ability to insulate under the floor of the house.
Post and Beam Framing Construction:
• A vertical member (post) is set on concrete pads, about 8 feet apart. The horizontal member (beam) is set on the posts.
• The beams are typically spaced 4 feet apart.
• The beam ends are placed in beam pockets that have been designed into the foundation.
• 2"x 6" or 2"x 8" tongue and grove planks are placed perpendicular on the beams to create the floor.
In slab construction, you pour a concrete floor between the footing and foundation. A joist system uses 2x material to span between two points; it is tied into a ledger board using metal hangers. More often, this system of construction is used for decks, and the second and third floors of homes.
c) Metal Roof Framing:
When steel framing is used, the roof framing is often done with prefabricated metal trusses.
If the trusses are fabricated on site, the chords and webs are cut with a portable electric saw and placed into a jig. They are then welded and/or connected with self-tapping screws.
Trusses that look like wood are used in some applications.
Commercial projects may use open web joists, known as bar joists, to support the roof.