How To Make Roof Rafters

Lean to rafters then connect to a ledger board against a wall of another shed or house.

How to make roof rafters.

Today we are tackling a big beginner lesson which is common rafter layout and cutting. Let s consider a basic gable wood roof framing design. In a fink truss the internal joists are arranged in a w shape ensuring even weight distribution from one end to the other. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

To lay out a common rafter you need the pitch of the roof expressed in units of rise per foot of run in the gable roof example shown here a rafter with 6 in 12 pitch rises 6 in. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. For example if your roof is 24 feet long you can have a 4 12 roof pitch.

Here we have a wood framed gable roof. Continuing on from part 3. The roof rafters provide integral structural support to the roof. The roof on this shed is a 4 in 12 slope which makes it a 18 and.

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. Laying out hip valley and jack rafters takes experience and skill but if you re building a simple gable or shed roof all you need is the common rafter the basic building block of roof framing. The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut. Common rafters are the most common type of rafter in construction.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Fink trusses were originally invented for the purpose of beefing up bridges but many contractors now use them to increase the strength of interior structures. Build a fink truss to bolster a floor roof or deck.

The first thing to determine is the pitch your roof will have and the span your roof needs to cover. You can use common rafters on any shed roof but they make the most sense when constructing a gable roof or lean to type shed roof where they can sit on or attach to top plates of a wall. This video shows how to make roof rafters with a rafter square and or a speed squ. For every foot.