rafter cable ties
rafter cable ties
(OP)
I cant understand this math. ive been over and over it. Each time I get a little further, then I loose it again.
ref:
How to calculate rafter thrust? -Help! at
http://www.eng-tips.com/viewthread.cfm?qid=105386
Can someone help me figure cable load?
4/12
24" rafter spacing.
No rafter ties at all. A few existing collar ties.
ceiling joists run parallel to ridge.
house is 27' x 30'(ridge).
7/8" roof planking and asphalt shingles.
thanks,
pa
ref:
How to calculate rafter thrust? -Help! at
http://www.eng-tips.com/viewthread.cfm?qid=105386
Can someone help me figure cable load?
4/12
24" rafter spacing.
No rafter ties at all. A few existing collar ties.
ceiling joists run parallel to ridge.
house is 27' x 30'(ridge).
7/8" roof planking and asphalt shingles.
thanks,
pa






RE: rafter cable ties
BA
RE: rafter cable ties
Very simple statics problem.
Do a free body diagram of one rafter (there is no vertical support at the ridge)
RE: rafter cable ties
ref: Do a free body diagram of one rafter (there is no vertical support at the ridge)
RE: rafter cable ties
BA
RE: rafter cable ties
ref: There is horizontal support at the ridge. So you can calculate all that you need to know.