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welder69
New Orleans Saints Fan
Member since Sep 2018
131 posts

Can I use cypress that is still green
For the post on my front an back porch of my new build? 12x12 & 8x8 will be used. They would be cut next week for me if want.


wickowick
LSU Fan
Head of Island
Member since Dec 2006
43405 posts
 Online 

re: Can I use cypress that is still green
Are they going to kiln dry them? More than likely without drying they will dry too fast and split


Art Vandelay
LSU Fan
LOUISIANA
Member since Sep 2005
8911 posts

re: Can I use cypress that is still green
Can’t kiln dry them much more than 30 % anyway if that. They are going to split and check. You either deal with it or use something else.


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RaginCajunz
LA-Lafayette Fan
Member since Mar 2009
3362 posts

re: Can I use cypress that is still green
I was curious about this as well. I'm eying up a pavilion project and the 6x6 beams seem to be "green" when browsing a few cypress websites.

I wasn't sure if that was simply how cypress beams are always sold, or if it had to do with the high demand for lumber across the board.


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2 Jugs
LSU Fan
Saint Amant
Member since Feb 2018
896 posts

re: Can I use cypress that is still green
When will the build start?

You can air dry them until a month out and then build a dehumidifier kiln to slowly get them to 12-15%.


Cracker
Montana Fan
in a box
Member since Nov 2009
12153 posts

re: Can I use cypress that is still green
Use green lumber outside should be just fine


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skidry
LSU Fan
Member since Jul 2009
2050 posts

re: Can I use cypress that is still green
quote:

Are they going to kiln dry them? More than likely without drying they will dry too fast and split


Legit question not trying to be a smartass.

How is any drying slower than sitting in the humidity of the south and why is kiln drying not too fast?


ChEgrad
LSU Fan
Member since Nov 2012
2014 posts

re: Can I use cypress that is still green
I can’t claim to be a green wood expert, but wood doesn’t typically shrink measurably in length. I would think you can use them for posts. I assume they will be left natural, and they will air dry over time and shrink in the 12x12 and 8x8 dimensions. You may want to coat the ends with something like Anchorseal to slow the drying out of the ends. This is where they will lose moisture too rapidly and it will cause splitting and checking.



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2 Jugs
LSU Fan
Saint Amant
Member since Feb 2018
896 posts

re: Can I use cypress that is still green
quote:

How is any drying slower than sitting in the humidity of the south


Direct sunlight in the middle of July and August is NOT the proper way to air dry wood.

30+% moisture content of green wood(freshly cut) will air dry to 15-18%(or lower) even in south Louisiana. Basic rule of thumb is 1 year per 1" thick but this can vary on species.


Churchill
New Orleans Saints Fan
Member since Apr 2009
345 posts

re: Can I use cypress that is still green
Yes, mine came right out of the swamp. I kept them in my warehouse with air circulation gaps between them and flipped them when I thought about it. I kept them for about four months before I used them. Cut them at least an inch longer than you need when ready to use.


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Cracker
Montana Fan
in a box
Member since Nov 2009
12153 posts

re: Can I use cypress that is still green
what is the relative humidity in south Louisiana?????
you want to bring the moisture content down to 8-15% then build with it when the relative humidity is double or triple that?

almost every log cabin that is in a national park was built with GREEN wood and guess what they are still standing just fine. kiln dried wood is acceptable in a conditioned space. Yes wood will move it always will, tangentially radial and longitudinal, BUT the least amount of movement is longitudinal less than .01%


2 Jugs
LSU Fan
Saint Amant
Member since Feb 2018
896 posts

re: Can I use cypress that is still green
quote:

what is the relative humidity in south Louisiana?????


It doesn't matter.

quote:

you want to bring the moisture content down to 8-15% then build with it when the relative humidity is double or triple that?


I have 3 stacks of wood(2 pine, 1 oak both stickered and uncovered in the shade) from my sawmill. Been stickered since June/July and last I checked the MC was around 16-18%. Not say that a 6x6 or 12x12 post would dry that quickly but the moisture will try to escape.

If OP wants to see how the posts will react to the drying process before using them, then drying them is the only way to do that. Checks and splits will most likely happen and OP can see which face he wants to turn inward/outward.

I have a cover for my camper that I will soon start milling wood for and most of it will be used green.


Cracker
Montana Fan
in a box
Member since Nov 2009
12153 posts

re: Can I use cypress that is still green
quote:

It doesn't matter.


Really physics matters!
Then tell us how much length on a ten foot cypress board that’s 8\4 will shrink in the next 90 days then in the next 120 days after that in 30% humidity genius! Probably less than what you would mis cut shut the hell up


welder69
New Orleans Saints Fan
Member since Sep 2018
131 posts

re: Can I use cypress that is still green
Thanks, I might just do it right and buy them dried out ready to go


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2 Jugs
LSU Fan
Saint Amant
Member since Feb 2018
896 posts

re: Can I use cypress that is still green
quote:

Really physics matters!
Then tell us how much length on a ten foot cypress board that’s 8\4 will shrink in the next 90 days then in the next 120 days after that in 30% humidity genius! Probably less than what you would mis cut shut the hell up


South Louisiana never gets to 30% RH. If it would ever get to 50%, I would be amazed. 75-85% is normal and as long as it is not 100% then the air can still accept water vapor.

Below is the OP.

quote:

For the post on my front an back porch of my new build? 12x12 & 8x8 will be used. They would be cut next week for me if want.


Nowhere in that quote does he mention anything about the posts shrinking or growing. So I took the OP to mean he worried about the appearance of the posts.


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TigerSprings
LSU Fan
Southeast LA
Member since Jan 2019
988 posts

re: Can I use cypress that is still green
They will not change in length. Width will shrink so just don't attach anything to them and you will be fine.


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Coon
Nicholls St. Fan
La 56 Southbound
Member since Feb 2005
18146 posts

re: Can I use cypress that is still green
Fwiw, green/new growth cypress is a terrible choice for weather exposed structural members.


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