Cover some of the more common roof and rafter terms you ll need.
Porch rafter roof framing.
Roof features associated with basic roof framing terms are shown in figure 2 2.
Rafters act more like the top chord of a roof truss than as a roof joist.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
All wood to be 2 douglas fir or better.
Porch depth footing size beam size max beam span rafter size post size 10ft 18 sq x 1 d 4x8 10ft 2x6 24 o c.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
Then divide by 12.
The function of each component is.
In a rafter roof all of these components are required to provide a stable roof.
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12ft 2 sq x 1 d 4x8 10ft 2x8 24 o c.
Position the square at the end of the rafter board with the tongue on your left and facing away from you.
Once completed roofing paper will be installed.
All construction shall comply with international residential code 2.
Here there are you can see one of our framing a porch roof gable gallery there are many picture that you can found we think you must click them too.
Span is the horizontal distance between the outside.
Position the square with both the 8 inch on the outside edge of the tongue and the 12 inch on the blade on the upper edge of the board.
The rafter plate on your wall that is where your rafters will be attached to your home is critical to maintaining the correct rise and run for your porch roof.
Rafter layout with a framing square.
Multiply the rise by the total run in inches.
When building a porch roof asphalt shingles or other roofing material are then attached over the roofing paper and drip edge.
As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.
This gives you the height for your rafter plate from the top of the ledger board.
Roof framing terms are related to the parts of a triangle.
Sheathing 1 2 inch plywood or osb is nailed to the rafters.
Then attach drip edge over the roofing paper.
Refer to the figure as you study the terms discussed in the next paragraphs.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
