Hexagon Roof Framing

Saw off 10 mm from a side so that it now measures 90mm x 80 mm.

Hexagon roof framing.

Enter pitch pitch and the plan angle at the eaves 120 for your hexagon and the common rafter span 2 common run in this framing angle calculator. It was difficult to hold all the roof beams in place until i had located them accurately. I positioned the cross members to coincide with the plywood roofing pieces. Some galvanised floor joist hangers came in really handy for attaching the roof to the main body.

Long and combine to create a base width of 9 ft. Edited 6 5 2006 9 54 am et by joebartok. Chop the 90 90 mm wooden block to a length of 550 mm. The unit run for the hip rafters is 13 7 8.

Then i cut all the parts and assemble the roof on the deck next to its intended location. This is how i ve worked out the formulae. One half of 45 is 22 5. Hexagon and octagon roof framing geometry tait chappell told me about the advance timber framing class at fox maple they put on last week where the students built a hexagon 13 5 12 common pitch with two dormers at 22 12 valleys joining into rotated purlin headers.

Start by making a central apex block to make a flat attaching point for every rafter. First i figure out the framing dimensions with a calculator. The tangent of 22 5 41421 laying out an octagon using a framing square we would take 12 on the blade and the number to be taken on the tongue is 12 41421 which is 4 97 or nearly 5. If i did this again i would build the roof frame on the ground and lift it into place once all secured together.

We have found the value of a which defines a point on the underside of the triangular panel directly under the roof s apex we know that when 2 planks meet at some angle the bevel will be the same right along the edge. The central angle for an octagon roof is 45. Mark and cut an end as shown in diag. The structures i have solved to date had backed hips meeting at the center.