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Old 02-07-2009, 09:02 PM   #1
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Repair Top of Rotted Floor Joist


I have a cantilevered deck 8 ft off the ground. As I was replacing the floor boards I notice that a portion on of the top 1 inch of two of the 11 cantilevered 2 x 8 joists are rotted. Can I cut 1 1/2 inches off the top the 2 x 8s and sister in a 1 1/2 inch piece of new pressure wood using construction adhesive and 2 inch screws to return the 2 x 8s to their full structural strength?

Ray-

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Old 02-07-2009, 09:13 PM   #2
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Repair Top of Rotted Floor Joist


Not really. Fact is that your joists rotting has significantly lessened their structural integrity and adding a piece of 2x2 in place of the rotted portion is really a 2x2 sitting on a 2x6, which is not structurally equivalent to a 2x8.

My suggestion is to either totally replace the 2x8's that are rotted with new pressure treated 2x8's, or sister new 2x8's against the side of the existing 2x8's. Would either be feasible?

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Old 02-07-2009, 09:30 PM   #3
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Repair Top of Rotted Floor Joist


I agree
Is the rotted parts the beams on the cantilevered end?
That would be even worse
Altho stress is on all of the joists
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Old 02-07-2009, 09:49 PM   #4
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Repair Top of Rotted Floor Joist


Yeah, if the rot is on the cantilevered part that is worse. The top of a cantilevered portion of a joist is in tension, and the full integrity of a cantilevered joist is critical to its performance.
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Old 02-08-2009, 12:16 AM   #5
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Repair Top of Rotted Floor Joist


Thanks for your response. To clarify, the cantilevered portion of the 2 x 8 Joists go 11 feet through the exterior wall and into the house. 5 1/2 Feet are on the outside of the exterior wall. The rot is 12 inches from the exterior wall on 2 joists. The other joists are structurally sound. From the responses so far it appears some are suggesting that I cut off all the cantilevered joists and intstall a ledger board and put up new 2 x 8 joists.

Last edited by nightsurfer; 02-08-2009 at 12:24 AM. Reason: To Answer Responses
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Old 02-08-2009, 12:35 AM   #6
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Repair Top of Rotted Floor Joist


no that is not what is being said.you are being advised to replace the rotten 2x8 the full lenght that the existing ones are.Do not cut the cantileverd joist unless your prepared to install properly sized post on a proper footing you will need a permit for that kind of work
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Old 02-08-2009, 12:45 AM   #7
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Repair Top of Rotted Floor Joist


Unfortunately since the cantilevered joists go through a brick veneer wall into the house I would have to tear out a ceiling to replace the full length of the affected joists. The building code in my area would require footers, 6 x 6 posts and a permit if I cut off the cantilevered joists.
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Old 02-08-2009, 06:26 PM   #8
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Repair Top of Rotted Floor Joist


Usually you just add another joist along side the damaged joist As added suport
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Old 02-08-2009, 10:24 PM   #9
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Thank you to everyone for the prompt and thoughtful replies.
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Old 02-09-2009, 07:33 AM   #10
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Repair Top of Rotted Floor Joist


I would suggest strapping with a new joist along side also, but use a joist hanger on the house side.
Cheers
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Old 02-09-2009, 09:31 AM   #11
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Repair Top of Rotted Floor Joist


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Originally Posted by cobracdn View Post
I would suggest strapping with a new joist along side also, but use a joist hanger on the house side.
Cheers
Cobracdn: Good Idea. Should I used a ledger lock or bolt to secure the joist hanger?
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Old 02-10-2009, 06:56 AM   #12
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Repair Top of Rotted Floor Joist


Depend on the hangers you can get. Here our most common hangers have small holes in them and we use 2-1/2" or 3 " deck screws.
Cheers
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Old 02-10-2009, 10:03 PM   #13
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Depend on the hangers you can get. Here our most common hangers have small holes in them and we use 2-1/2" or 3 " deck screws.
Cheers
Cobracdn . . . Thanks for your advice.
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Old 02-11-2009, 07:51 AM   #14
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Repair Top of Rotted Floor Joist


Your welcome, good luck with the project
Cheers
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Old 02-11-2009, 08:05 AM   #15
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Repair Top of Rotted Floor Joist


Quote:
Originally Posted by nightsurfer View Post
Unfortunately since the cantilevered joists go through a brick veneer wall into the house I would have to tear out a ceiling to replace the full length of the affected joists. The building code in my area would require footers, 6 x 6 posts and a permit if I cut off the cantilevered joists.
How much rot is there?

Where is the joist rotted?

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