Second post of the day – as soon as I wake up and right before I go to sleep…..don’t believe everything you hear….
In this shot, you can see the rafters installed. I suppose this is the “main event”: if the line length is not correct, the ridge will not be level..this will impact the installation of the sheathing, the starter and the shingles….I know I told you to cut these rafters a little long, that they always can be shortened, but really, we do not want to force them n if they are too long….the roof will “grow” and it will be impossible to correct once everything is attached….be careful!
These are “common” rafters. In reality, they are jack rafters, as the bottom cut is compound; there is no bird’s mouth, no tails and the “seat” is angled. We will discuss this in class as I demonstrate and as I correct your practice rounds.
The second rafter is the one we have been calling the jack, and its length is determined by the length of the 1st rafter, using the tables on your square. Again, I will review the reading of the tables as I demonstrate.
A few words on the practice rounds: do not rush to announce you are ready for the exam…..make sure you know why you are making a cut, a measurement, a installation. Guess work will probably result in a failure for that element of the exam. I know I said you should work on your own, but on sober second thought, I recommend you work in pairs to attempt the initial dormer (Friday). Two of you can more likely question the choices you are making and ascertain the correct one. There will be plenty of time for you to practice on your own(Monday or Tuesday) before attempting the final effort (Tuesday or Wednesday).
See you tomorrow – bring your little notepads,