Garage Roof Rafter Design

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

Garage roof rafter design.

In order to build a garage roof you need to use the following. Our garage plans are to designed to irc building code conventional framing details. Many of the plans use manufactured roof trusses and others use conventional rafter and joist framing. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

If you re building rafters and aren t sure where to start when determining the length of your lumber you re in the right place our rafter stock size calculator shows you how long your rafters should be so you ll know what you need in terms of framing lumber dimensional lumber studs and more. C 30 pieces of 2 4 lumber 97 1 4 14 pieces 6 1 2 rafters d 14 pieces of 3 4 tongue and groove plywood sheets 4 8 decking. Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. Here we have a wood framed gable roof.

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Your garage plans should include the following information to aid you when ordering the roof trusses. B 2 pieces of 2 4 lumber 36 1 4 1 piece of 2 6 lumber 260 top ridge. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Just enter the dimensions of the roof rise and run to get started. 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.

Slope size of rafters spacing length of overhang location and size of ceiling joists size of ridge beam and any other bearing beams and load weight. Continuing on from part 3. There are certain situations where offset is more practical than opposed rafters which usually occurs on very. Let s consider a basic gable wood roof framing design.

A 13 pieces of 2 4 lumber 144 long bottom rafters. All behm design garage plans include foundation plans and details using industry standard materials and assemblies. It is always better to have a large rafter rather than be concerned with a sagging roof. Offset rafter framing can be done on garage roof framing if you are building a garage from plans that are sealed by a professional architect or structural engineer licensed within the jurisdiction you are building a garage in if those designs specify rafter offset.