shrink on SYP RC

[Sedgehammer]

I can buy SYP RC green much cheaper then store bought. I can get it cut in any dimension I want. What dimension wood they need to cut it to get an air dried 1.5" and 3.5" size?

Thanks

[scsmith42]

I usually estimate 1/16" per inch of wood thickness for SYP drying related shrinkage.

[Sedgehammer]

I usually estimate 1/16" per inch of wood thickness for SYP drying related shrinkage.

Hmm. then 1-5/8 RC dimension wood be a bit over 1-1/2 
I wonder if regular hangers wood work on that dried dimension

[btulloh]

Yes. I've used them on stuff I sawed at 1 5/8 no problem. Don't want to saw it a fat 1 5/8 though.

[Sedgehammer]

so on the 6" side, how much will that shrink on average?

[btulloh]

I usually saw 5.75 to end up at 5.5 and it works out pretty well. Not entirely predictable because grain orientation makes a difference in shrinkage ratio. Species vary also. But SYP works out pretty well for me at 1.625 x 5.75.  2x4, 8, 10, 12 adjust the width accordingly as you go up or down in width. 

[Sedgehammer]

I usually saw 5.75 to end up at 5.5 and it works out pretty well. Not entirely predictable because grain orientation makes a difference in shrinkage ratio. Species vary also. But SYP works out pretty well for me at 1.625 x 5.75.  2x4, 8, 10, 12 adjust the width accordingly as you go up or down in width.

if stacked and stickered, about how long to get it dried enough to fit in those hangers?
Also when stacked, covered with tarps and fans blowing or?

[Southside]

Covered with tin, not a tarp and yes on the fans.

[Sedgehammer]

@Southside Tin, ok. How to exactly if you don't mind? Also how long to dry enough?

[scsmith42]

so on the 6" side, how much will that shrink on average?

Around 3% - 4%, give or take on the 6" width if flatsawn.
Re drying, 1-5/8" syp will fully air dry in  my area in around 90 days in the summer, and that's w/o fans.  Fans will drop that in half, depending upon the time of year.

[Sedgehammer]

@scsmith42 How wood you stack that? 

[scsmith42]

@scsmith42 How wood you stack that?

Stickered on either 24" centers. This time of year it won't dry fast due to the low temps.

[Southside]

I just put a row of stickers on top of the stack of lumber, then a layer of old tin to keep the water and direct sun off, throw on something heavy to keep the tin from blowing off and it's done.  

[Sedgehammer]

@scsmith42 & @Southside 

How about a tunnel 5' by 32' long with 2 big fans on the ends one pushing, one pulling. Black plastic laid over the top down both sides? 

If not above, 24" wide stacks, about how high? How much over hang on the tin tops? 

Thanks

[Southside]

You really don't want your stacks, and airflow to be wider than about 42". After that you really loose drying efficiency. 

Plastic wrapping SYP will increase drying time and promote mold. The more, warm, dry, air you can get over the surface the better. 

[scsmith42]

@scsmith42 & @Southside

How about a tunnel 5' by 32' long with 2 big fans on the ends one pushing, one pulling. Black plastic laid over the top down both sides?

If not above, 24" wide stacks, about how high? How much over hang on the tin tops?

Thanks

Our standard lumber stacks are between 40 - 48" wide, 6' tall, and whatever length that the boards are.  This size works well with the various fork lengths on our loaders, with drying efficiency, and with our kiln sizes.
Our standard sticker spacing for the kilns is 18"; however if we are only air drying barn lumber we will sticker on either 24" or 36" spacing for most 4/4 and 8/4 lumber.  If we're stickering thicker lumber, we will increase to 48" or so spacing.
If you put tin on top of the stacks, it's a good idea to have it extend past enough so that it does not drip on the portion of any stickers that extends beyond your lumber stack.  Wet stickers can lead to sticker stain on the lumber.

[Sedgehammer]

@Southside & @scsmith42

Stacks about 4; wide, no wider. Stickers 24" apart. As long as the wood is (16' in the case). Metal over hanging about a 1' each side? 6' x 20'?

We're almost always breezy here. Orientation matter?

[scsmith42]

@Southside & @scsmith42

Stacks about 4; wide, no wider. Stickers 24" apart. As long as the wood is (16' in the case). Metal over hanging about a 1' each side? 6' x 20'?

We're almost always breezy here. Orientation matter?

You got it!  The long side of the lumber stacks should be placed perpendicular to the prevailing wind so that you have maximum air flow through them.  

[Sedgehammer]

What about end to end shrink as in posts or 2x10 or 12, 4 plys?  I need one post for the center of the shed to hold up the second floor header.

Speaking of headers. I know Don has a calculator, but i don't know what to use for loads.

Building is 32' wide. the 2nd floor is 20' deep. So the post wood be supporting at this point an area 32' x 20', but of course the walls are support half. 

The header that sits on top of the above post wood be supporting the 20' deep 2nd floor at the 16' point (center of the 32' wide shop) and I wanted a 4' cantilever for the balcony of the same header. I currently of this header consisting of 1.625x11.5 combinations of 16' - 8', 8' - 16', 12' - 12', 6' - 18' = 24' long header (20' for 2nd floor and 4' for balcony cantilever), so a 4 ply

Can anyone help with that?

[Sedgehammer]

i can put another post at the 12' point. So there wood be 2. 12' and 20' where the upstairs wall ends and a 4' cantilever for the balcony.  

so mostly wonderin about end shrink on posts or plys made into posts

[scsmith42]

There are a number of factors that can influence shrinkage.  Typically it is anywhere from .1 to .2% 

Personally I allow 1% for longitudinal shrinkage in SYP.  That works out to be around 1" per 8'.  

[Sedgehammer]

There are a number of factors that can influence shrinkage.  Typically it is anywhere from .1 to .2%

Personally I allow 1% for longitudinal shrinkage in SYP.  That works out to be around 1" per 8'.  

Holy smokes batman! is that for posts or 2x also?

[scsmith42]

There are a number of factors that can influence shrinkage.  Typically it is anywhere from .1 to .2%

Personally I allow 1% for longitudinal shrinkage in SYP.  That works out to be around 1" per 8'.  

Holy smokes batman! is that for posts or 2x also?

Anything.  Keep in mind that this is my milling tolerance - not a finished installation tolerance.

[Sedgehammer]

There are a number of factors that can influence shrinkage.  Typically it is anywhere from .1 to .2%

Personally I allow 1% for longitudinal shrinkage in SYP.  That works out to be around 1" per 8'.  

Holy smokes batman! is that for posts or 2x also?

Anything.  Keep in mind that this is my milling tolerance - not a finished installation tolerance.

Please expound. 

[scsmith42]

If I want to net a 16' board, I will not mill a log less than 16'2". If it shrinks 1% the boards will end up at 16' after drying.

Typically the longitudinal shrinkage is much less, but I have personally experienced 1% shrinkage in SYP boards that were milled from the outside of the logs.