3/8/2023 0 Comments Roof rafter bracketsOne often thinks of the structural integrity of a roof in terms of its ability to withstand the downward forces of snow loads. Make sure that they are snug up against the rafter edges and that the rafter is in its exact position.When it comes to the roof of your home, the inherent strength and ability to withstand adverse weather conditions lies in the weakest link. Use 2 inch screws to attach the blocks to the floor. Screw the blocks of wood to the floor so they can be easily removed after building the rafter assemblies. Now attach wood blocks on each side of the rafters to hold them in their locations. Each rafter should be overhanging the edge of the shed floor by one half of an inch. The rafter ridges should be fully touching each other along the cuts at the ridge and the seats should be flush with the edge of the shed floor along the entire cuts. Test fit the rafters by setting the rafter seats on the edge of the shed floor and placing the peak of the rafter on the overall height mark on the center line. This measurement can be found on the rafter plans. Then measure up from the edge of the shed floor and mark the overall height of the rafter assembly. Using one end of the shed floor that is the same width as the rafter assemblies, make a line on the exact center of the floor. The fourth step is to build a temporary jig on the shed floor to aid in building the rafter assemblies. Use a wood chisel and hammer to remove the remaining wood. The piece of wood should be easily removable at this point but there will still be a bit of wood in the corner that will need to be taken out. To fully remove the piece of wood you will need to flip the rafter over and continue the cuts to their intersection point. Make sure to cut on the waste side of the lines and cut only to where the lines intersect. Set your circular saw to its deepest cut setting and cut along the birdsmouth and seat lines. Mark a line from that point to the birdsmouth depth line. To mark the seat cut you will flip the square over and place the pivot point where the seat mark meets the edge of the board. ![]() ![]() With the square still on the birdsmouth mark, measure up the line you just made and place a mark showing the depth of the birdsmouth according to your rafter plans. Pivot the square until the 4 on the Common marks lines up with the edge of the board. To mark the birdsmouth angle place the pivot point of the square where the birdsmouth mark meets the edge of the board. Use the square to place marks all the way across the board on the two points you just made. Then measure further down the board to mark the end of the horizontal seat mark. Measure from the eve end of the rafter to the start of the vertical birdsmouth and place a mark. ![]() Refer to your plans to find the dimensions for the roof angle you are cutting. The vertical cut is called the birdsmouth and the horizontal cut is called the seat. The second step will be to mark and cut out the birds mouth and horizontal seat. Make sure to cut on the “waste” side of the line so the rafter size will be as accurate as possible.If you have a chop saw you can set the angle of your ridge cut on the saw and make the cuts without using the angle from the framing or speed square. You will also notice that the 18 and one half mark on the Protractor markings will be lined up with the edge of the board. ![]() Pivot the square until the 4 on the Common markings lines up with the edge of the board. Now take the square and put the pivot point, on the point where the line you made meets the edge of the board. Measure from the eve end of the rafter board to the long point that will be the ridge of the rafter and place a mark on the board, this is the overall length of the rafter.Use the square to make a square line on the board that goes from edge to edge of the board. A rafter or speed square will have marks for both of these angles. The roof on this shed is a 4 in 12 slope which makes it a 18 and one half degree angle on the board ends. The ridge end of the rafter, and often the eve end, will need to be cut to the angle of the roof slope. The first step in building the roof rafters is to cut one rafter board to length with the ends angled properly and then to mark and cut the birds mouth and seat on the rafter.
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