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brian5

07:53AM | 04/08/04
Member Since: 12/27/03
6 lifetime posts
Bvtools
Hi everyone,

I will be building a deck off the back of my home this spring, approximately 12 x 20 in size. My rim joist on the house is a 2 x 8, I'd like to use 2 x 10 pt lumber for the floor joists because it can handle the 12 foot span without the need for support in the middle. A website I came across recommended NOT using a

2x10 ledger board because it will not make full contact with the rim joist and therefor leave a weak spot at the bottom of the ledger. The site suggested using a 2x8 ledger, and notch the bottom corner of the 2x10 deck floor joists to fit into a 2x8 hanger. Is this necessary? Or can I use a 2x10 ledger without comprimising the structure? Any ideas, suggestions, or advice would be greatly appreciated. By the way, I do not have enough clearance under the deck for a drop beam, so I can't cantilever the deck. Thanks!

homebild

04:58PM | 04/08/04
Member Since: 01/28/03
694 lifetime posts
There is absolutley NO reason to not use a 2x10 ledger board up against the house which has a 2x8 rim joist.

The reason is simple:

A 2x8 rim joist is fastened on top of a 2x6 or whatever bottom plate which means the total height of the rim joist plus bottom plate is 7 1/4" inches plus 1 1/2" or a total of 8 and 3/4" thick.

The height of a 2x10 joist is only 9 1/4" or only 1/2" less than that of the rim joist and plate and well enough with which to attach a ledger board.

Since thru bolts or lag screws will be used to anchor the ledger board to the rim joist and plate, and since the bolts or lag screws will be kept at least 1-2" from the top and bottom of the 2x10 ledger board....placing a 2x10 ledger board against a 2x8 rim joist is irrelevant and should not compromise the safety of the structure at all under most conditions.

Check with your local code enforcement agency and local structural engineers to be sure.


brian5

06:34AM | 04/09/04
Member Since: 12/27/03
6 lifetime posts
Thanks for the advice, homebild. Actually, I was wrong, I have a 2x6 rim joist on top of a 2x6 sill plate, so my total height is around 7 inches. By the time I factor in the decking material, it drops a 2x10 about 3 1/2 inches below the sill plate. I'll have to check with my local code office or a structural engineer. Thanks!

Brian

Altereagle

10:13PM | 04/20/04
Member Since: 12/27/02
545 lifetime posts
I just noticed this post... busy.

Who ever told you to notch the bottom of the 2x10 must have misunderstood your question for starters... as soon as you do that the joist becomes the size of the timber left. 2" notch a 2x10 becomes a 2x8 structurally.

Next you can span 14'2 with 2x8 d.fir/larch or S.pine #2 or better @12 o/c 12'9 @16 o/c plenty for a deck at 40 psf live and 10 dead.

Next bolting will req. a 1/2 @ 12" o/c or 5/8 @ 16 o/c for a 12' joist span

Next your flush beam... a 4x10 with a girder span of 7' or a 4x8 beam at 6'

Always consult an engineer when in doubt but that is the info I use for joist spans.

You can look up the options yourself on a site I've just started building:

http://www.decks-ca.com/

I do have the pages completed with the joist spans etc. I mentioned above.

http://www.altereagle.com/" ******=_blank>Alter Eagle Construction & Design




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