Extending My Deck. Sistering A 2x12 To A 2x6 Joist To Gain Riase Need Help - Building & Construction - Page 2 - DIY Chatroom Home Improvement Forum


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Old 05-13-2013, 03:19 PM   #16
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


If you don't raise the old deck surface also this would create a 6" step up to the new deck? Or will you raise the old deck to level out with the new deck. Am I correct?

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Old 05-13-2013, 03:21 PM   #17
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


if I understand correctly it is 8' from the (2)2x6 beam back to a another beam (going towards the house) and you want to install another beam 5' from the (2)2x6 going away from the house. The length of the (2)2x6 beam is 8?
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Old 05-13-2013, 03:23 PM   #18
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by madmilitia View Post
yes that is exactly what i'm trying to do,

now my main question will that already exsting beam support the 2x12s or do i need to add another support beam right next to it.

and yes i will be putting in the red beam
Adding (sistering) in another slab of beam is not as effective as many people think it is. The existing beam will handle very heavy loads IF the spans between support posts in the ground are not very far... like 5 or 6 feet apart. (Three or four feet is even better.)
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Old 05-13-2013, 03:40 PM   #19
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by MJ Force View Post
If you don't raise the old deck surface also this would create a 6" step up to the new deck? Or will you raise the old deck to level out with the new deck. Am I correct?
correct, i'm trying to create a 6 foot raised section.
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Old 05-13-2013, 03:43 PM   #20
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Adding (sistering) in another slab of beam is not as effective as many people think it is. The existing beam will handle very heavy loads IF the spans between support posts in the ground are not very far... like 5 or 6 feet apart. (Three or four feet is even better.)

the main 4x4 posts that connect to the footers are maybe 2 feet. mu old deck is basicly an on ground deck.

the footer posts are like 8-10 feet away from each other.
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Old 05-13-2013, 03:44 PM   #21
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by GBrackins View Post
if I understand correctly it is 8' from the (2)2x6 beam back to a another beam (going towards the house) and you want to install another beam 5' from the (2)2x6 going away from the house. The length of the (2)2x6 beam is 8?

correct,
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Old 05-13-2013, 03:44 PM   #22
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


Your new beam, at least a double 2x10". Same with the existing beam. Joist size is fine if you need that size for the new deck. However the span(8') of the existing 2x6" joist on the old deck is too far. Does it bounce? Like GBrackin said, it needs more support mid-span.

You know you'll have a step in your deck right? 5' away from the edge of the pool.
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Old 05-13-2013, 03:46 PM   #23
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


look at Table 3 on page 5. add the 5' length of joist to the existing length of joist (I believe you said 8') this would give you 13'. for example for southern pine (2)2x6 beam could only span about 4'-8" between columns.

if I understand your current 4x4 columns we 8' apart then to span 8' you would need (2)2x10 or (3)2x8. again this is using southern pine as the wood. the 2x6's not going to make it.
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Old 05-13-2013, 03:47 PM   #24
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by MJ Force View Post
Your new beam, at least a double 2x10". Same with the existing beam. Joist size is fine if you need that size for the new deck. However the span(8') of the existing 2x6" joist on the old deck is too far. Does it bounce? Like GA said, it needs more support mid-span.

You know you'll have a step in your deck right? 5' away from the edge of the pool.

there is no bounce in the deck righ now.

i think i'm going to add a support beam like 8 inchs away from the support beam that is there right now. i know the deck i have isn;t up to code, and adding a second support beam will prolly give it better strength. i just hate digging 3 foot holes.
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Old 05-13-2013, 03:49 PM   #25
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by madmilitia View Post
the main 4x4 posts that connect to the footers are maybe 2 feet. mu old deck is basicly an on ground deck.

the footer posts are like 8-10 feet away from each other.
That short a length of each individual post is almost not worth mentioning, but the distance between them is sounding pretty far. I'd probably put two more posts in the space between them.
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Old 05-13-2013, 03:50 PM   #26
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Originally Posted by madmilitia View Post
there is no bounce in the deck righ now.

i think i'm going to add a support beam like 8 inchs away from the support beam that is there right now. i know the deck i have isn;t up to code, and adding a second support beam will prolly give it better strength. i just hate digging 3 foot holes.
Get some kids, and give them $20 a hole....
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Old 05-13-2013, 03:52 PM   #27
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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Get some kids, and give them $20 a hole....

lol naw i'll do it, so is there a way to add support under the beam that is already there?

because i know this deck is not to code.
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Old 05-13-2013, 03:57 PM   #28
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


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lol naw i'll do it, so is there a way to add support under the beam that is already there?

because i know this deck is not to code.
Yes, by all means. That's exactly what I would do.

Dig the holes... add the steel... pour the concrete... put the mount blocks in place... then cut some posts an eighth to 3/16 longer than necessary (you can always shave then down if you need to), and knock them into place with a small sledge hammer.
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Old 05-13-2013, 03:59 PM   #29
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


Quote:
Originally Posted by Willie T
I'd probably put two more posts in the space between them.
There you go! And ,Just use double 2x10" for the new beam if its gonna span 8'+ and add a rim joist to the joist if you don't use bridging.
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Old 05-13-2013, 04:07 PM   #30
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extending my deck. sistering a 2x12 to a 2x6 joist to gain riase need help


Quote:
Originally Posted by Willie T View Post
Yes, by all means. That's exactly what I would do.

Dig the holes... add the steel... pour the concrete... put the mount blocks in place... then cut some posts an eighth to 3/16 longer than necessary (you can always shave then down if you need to), and knock them into place with a small sledge hammer.

ok ok i'm new, first things first.

this second support beam that i'm going to stand up, i want to put it as close as i can to the excisting one, because i'm still going to siste the 2x12s to the old 2x6 joists for strength.

so i'm hearing (2)2x10's for the new support beam, keep in mind if i can dig the hole right taht new support beam is going to be like 2-3 inches from the excisting support, <<< doing that do i really need to use 2x10's

second are you saying that i CAN dig holes under the old beam and fill in concreate and hammer in more 4x4's?

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