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Old 06-27-2010, 08:11 AM   #1
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Best way to attach a rafter to a ledger board?


I'm building a lean-to on the back of the house and I can't figure out the best way to attach a rafter to the ledger. It's at an angle, so can you use joist hangers? I drew up a little pic of the situation.
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Old 06-27-2010, 10:44 AM   #2
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Best way to attach a rafter to a ledger board?


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I'm building a lean-to on the back of the house and I can't figure out the best way to attach a rafter to the ledger. It's at an angle, so can you use joist hangers? I drew up a little pic of the situation.

use a joist hanger and cut a kerf into the rafter at 90 degrees to the ledger

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Old 06-27-2010, 10:52 AM   #3
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Best way to attach a rafter to a ledger board?


Thanks for answering, I actually thought of that about 5 min ago
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Old 06-27-2010, 11:28 AM   #4
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Best way to attach a rafter to a ledger board?


I would think that simpson makes some kind of metal fastener for that. I would also think that some kind of metal angle on each side would work, too.
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Old 06-27-2010, 11:45 AM   #5
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Best way to attach a rafter to a ledger board?


simpsons makes right angle framing brackets, but the best and most coste effective would be to use solid blocking between each rafter
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Old 06-27-2010, 12:04 PM   #6
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Best way to attach a rafter to a ledger board?


Use a positive connection like Simpson for the pull-away resistance they give. Solid blocking around here is no longer accepted by code because of their failure rate. If a large lean-to, a LUS hanger may be required or steel strapping. (L = solid lumber, U = "U" shape, S = shear) http://www.strongtie.com/products/co...ace_ss-df1.asp

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Old 06-27-2010, 12:18 PM   #7
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Best way to attach a rafter to a ledger board?


What do you mean by solid blocking? This lean-to is only about 8 feet long and 6 ft wide. Big enough for a riding lawn mower, but it will be a way to get on the roof.
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Old 06-27-2010, 12:48 PM   #8
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Best way to attach a rafter to a ledger board?


Could you just crossnail from the sides, or is that considered bad practice nowdays?
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Old 06-27-2010, 04:03 PM   #9
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Best way to attach a rafter to a ledger board?


this is the way i'm doing it.....anybody think this is not right?
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Old 06-27-2010, 04:10 PM   #10
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Best way to attach a rafter to a ledger board?


What do you plan to do about moisture leakage in the area of the ledger? - Flashing under the moisture resistant wrap or what?

It seems bad if a tiny shed could cause $10,000+ damage from mold and rot.

Dick
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Old 06-27-2010, 04:35 PM   #11
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Best way to attach a rafter to a ledger board?


This is just a small lean-to against a brick wall on my parent's mountain house. The lean-to will be under the eave
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Old 06-27-2010, 04:55 PM   #12
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Best way to attach a rafter to a ledger board?


Ah... snow load. Rest the rafter on the heel, not the toe (or hanger the heel). Page #38, fig. #19: http://books.google.com/books?id=iwS...rafter&f=false

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