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Old 05-30-2014, 07:43 PM   #1
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rafter cable ties


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

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Old 05-30-2014, 08:40 PM   #2
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rafter cable ties


not sure what we a suppose to look at on link

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Old 05-31-2014, 09:59 AM   #3
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rafter cable ties


try this ....

http://www.timbertoolbox.com/Calcs/RafterThrust.htm
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Old 05-31-2014, 10:02 AM   #4
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Quote:
Originally Posted by GBrackins View Post
I dont know "Load on Rafter (pounds/sq ft)"

pa
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Old 05-31-2014, 10:54 AM   #5
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rafter cable ties


Quote:
Originally Posted by paulmars View Post
I dont know "Load on Rafter (pounds/sq ft)"

pa


You can work out the dead load of your roof by looking in books or tables showing the weight in lbs/per sq ft of various materials.

To this you add the live load - principally snow load - which your local building inspector will be able to tell you.

You add the dead load to the live load to give a total maximum load in lbs/sq ft.
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Old 05-31-2014, 10:59 AM   #6
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rafter cable ties


thanks tony!
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Old 05-31-2014, 11:21 AM   #7
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no snow here
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Old 05-31-2014, 12:26 PM   #8
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your building code will specify your live load requirement. if you don't know your code your building official will be able to provide that to you.

dead load is the weight of the materials used in the construction of your roof. roof dead load can vary from 10 pounds per square foot upwards, all depends on the materials used.
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Old 06-14-2014, 07:37 PM   #9
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Quote:
Originally Posted by tony.g View Post
You can work out the dead load of your roof by looking in books or tables showing the weight in lbs/per sq ft of various materials.

To this you add the live load - principally snow load - which your local building inspector will be able to tell you.

You add the dead load to the live load to give a total maximum load in lbs/sq ft.
I dont know what type of woods used.

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