What are the elements of roof framing plan?
One of the most important parts of building a sturdy roof is the initial roof framing plan. Roof framing simply describes how a group of rafters and beams are fitted or joined together in order to provide support for the roof covering.
Measuring and cutting the rafters for the frame
- Plumb cut.
- Bird’s mouth cut.
- Tail cut.
What is the purpose of a roof framing plan?
Using I-joists requires the same basic understanding of rafter layout and roof design. Truss roof framing is cov- ered in Section 17.4. The main purpose of a roof is to protect the house in all types of weather with a minimum of maintenance.
What are the different types of roof framing members?
The basic structural members of the gable roof are the ridgeboard, the common rafters, and the gable-end studs.
What do roof rafters sit on?
The rafter tie resists the outward forces imposed on the load-bearing walls. As the rafters sit on top of the wall plates at an angle, they exert horizontal forces on the exterior walls. Rafter ties, which often double as ceiling joists, prevent these horizontal forces from causing the walls to “pancake.”
What are three of the main considerations for connecting ceiling joists?
They must be at the same spacing and in the same direction as the main rafters so they can be fixed to, and act as ties between the feet of opposing rafter pairs. Where there is no internal wall to support the ceiling joist a hanging beam must be installed.
Which is better rafters or trusses?
Once in place, rafters use up more wood, so they weigh more, but trusses are stronger because they are more efficient and have the capacity to produce maximum strength using fewer materials in the end.
What are the most popular types of roofs?
These are the most common types of roofs used on residential homes.
- Asphalt Shingles. Asphalt shingles are the most popular roofing material for homeowners today. …
- Metal Roofing. This type of roof is becoming more and more common. …
- Ceramic Tiles. …
- Slate Shingles. …
- Wood/Cedar Shake Shingles.
How do I know what size Rafter to buy?
Determine Length of Common Rafter. Determine Run : Divide the span in half, in our case 24 feet divided by 2 = 12 feet run. This is the horizontal distance the rafter travels to meet the one from the other side.
What prevents rafters from spreading?
Rafter ties are installed between opposing rafters, and they should be installed as close as possible to the top plate. Rafter ties resist the outward thrust that rafters exert on the exterior walls. They help keep walls from spreading due to the weight of the roof. When the walls spread, the ridge board might sag.
How can I make my roof stronger?
Reinforce the Trusses
- Apply construction adhesive. Apply construction adhesive along the edge of the truss to strengthen the connection to the plywood roof deck. …
- Stiffen Trusses. …
- Brace gable ends. …
- 4a and 4b. …
- Clean out gutters. …
- Repair and caulk flashing. …
- Check for loose or damaged shingles. …
- Lift shingles or underlayment.
What size rafters do I need for a 12 foot span?
Max. Live Load 20 lbs/ft2 (956 N/m2)
|Maximum Span (ft – in)|
|Nominal Size (inches)||Rafter Spacing, Center to Center, OC (inches)||Lumber Grade|
|2 x 6||24||13′|
|2 x 8||12||21′ – 7”|
|16||19′ – 7”|
What is the highest horizontal roof member?
A Ridge Board is the highest horizontal roof member that helps to align the rafters at the upper end.
What does a 6 12 pitch mean?
One of the most commonly used terms in roofing. … Roof pitch (or slope) tells you how many inches the roof rises for every 12 inches in depth. An Example of a roof pitch would be a “6/12 pitch” which means that the roof rises 6 ” for every 12″ inward towards the peak (or ridge).
What is a roof frame called?
There are two common ways of framing the roof of a house: with premanufactured trusses, or with rafters and ceiling joists, commonly called stick framing.