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How to figure deck boards

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How to figure deck boards jdguay 07-12-2008
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Posted by jdguay on July 12, 2008, 1:00 pm
Hi all,

Because of water damage to the wall of my house I had to remove my
existing deck. I was able to leave the outer frame but had to remove
ledger board, joists and deck boards.

I have repaired water damage and I am ready to rebuild deck. The old
deck had no joist hangers and honestly was not built very well. I am
going to make it free standing with posts in concrete and 2x10 beams.
More questions about that later.

I am trying to determine how much and what sizes of lumber I need. My
big question is deck boards. The deck is just over 18 feet wide, and
the longest 5/4x6 deck boards I can get are 16 feet. How do I figure
out what lengths I should use? Obviously I would like the fewest
number of seams and to not waste money buying the wrong lengths. I
can't put them on at an angle without removing all the railings and it
also sits partially against a wall. I have tried some of the online
deck designers but they have me using 18 footers. Is there a software
to give me the best layout for the deck boards?

Thanks,
Jeff



Posted by dpb on July 12, 2008, 1:10 pm
jdguay wrote:
...
> big question is deck boards. The deck is just over 18 feet wide, and
> the longest 5/4x6 deck boards I can get are 16 feet. How do I figure
> out what lengths I should use? ...

Well, one way would be to look at what was used before...

To figure from scratch if that doesn't solve the problem, 18's would
definitely be pricey even if you could find them so they're out of
consideration plus the "just over" indicates they might not be long
enough, anyway, perhaps?

Have to start w/ the precise overall length you need. Is it actually
18', or 18-3 or what?

If it were actually such that 18 would do, I'd use a mixture of 8's,
10's and 12's, staggering joints either randomly or in a specific pattern.

If it is actually a little over, then figure out the nearest multiple
that gives the least cutoff waste when split over two or three.

--





Posted by Edwin Pawlowski on July 12, 2008, 2:03 pm

> I am trying to determine how much and what sizes of lumber I need. My
> big question is deck boards. The deck is just over 18 feet wide, and
> the longest 5/4x6 deck boards I can get are 16 feet.


"Just over" is going to create a PITA. If exactly 18' you can use various
combinations of 8, 10, 12, 16 to get there with almost no waste.

Personally, I'd rethink the size if you have not started yet and either
scale back to 16', go up to 20', or at least stop at an even 18'. With
even 18' you can go with 12 & 6, then 6 & 12, then 8 & 10, etc.



Posted by jdguay on July 12, 2008, 3:32 pm
OK, its exactly 18' 6". I can't change the width because the deck
frame is still in place. I have some of the old deck boards but alot
of them broke when I was taking them out.

Posted by cshenk on July 12, 2008, 3:57 pm
"jdguay" wrote

> OK, its exactly 18' 6". I can't change the width because the deck
> frame is still in place. I have some of the old deck boards but alot
> of them broke when I was taking them out.

Interesting thread! I've not done this but would one seam be acceptable?
Measure and see if you have a spot where the floor beam hits just right to
use a 12ft and but up the end of something shorter to make up the
difference? This would make a single seam all along which you may not want
but seems easier? Perhaps if the floor beams are even, you could alternate
the pattern so a seem on every other board and another set on the other side
just like it?



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