Building Concepts III Course First and Second Week CMCC- Hips Roof Assemblies Weeks 14 and 15

 Picking Up on the Timber Frame: Week 14

Week 14 was all of one full day of shop work and that shop day was spent working on pluming up and squeezing together the joints of our timbers on our timber frame shed. Once they were viced and clamped, we applied gusset plates to each side of every corner to hold them in place.  

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Trick of the Trade for  Week 14: Loose Rafter Racking System

This system works well because occasionally you find yourself on the job site without an extra pair of hands and if you have every racked roof rafters it can be scary and difficult even with two people. The beauty of this method of racking is that it works better with a larger or longer roof. The two photos above and below are of that system used to "rack" a loosely secured roof system into a plum position. First join the two 2" member pieces with one nail which will act as the pivot point. Then have the lower 2 x 4 nailed at both end points, fasten a nail to the roof rafter closest to the pivot point next to the lower 2 x 4. Finally, your able to pivot two pieces and because of where they are fastened they will either pull the roof to the right or left depending on which direction you pull and push that pivot point. 

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Hip Roof Rafters: Week 15

This photo below illustrates the complexity of a Hip style roof. Among the many different types of members involved comes the math with calculating each of them. Not a hard determination to make when the math is exercised enough and also applied. Its all geometry. What we are being exposed to in class are all the different methods to calculating lines lengths of a hips, valleys and jack rafters.  Using math to determine line lengths we can determine the length of every single member in this roof needed for an estimate lets say. If conceptually that's difficult simply look at this roof system in terms of an organized grouping of triangles and squares which will then make it make a lot more sense because that is all it is.   

Compound Miter Cut or the Double Cheek Cut

Here you can see our double cheek cut joining at the ridge rafter next to a common rafter.