cold1313
Gold Member
I was wondering what you guys have used for posts into a pond for a dock? I forget the name of the grade off of the top of my head but there are some posts treated and coated for constant water contact.
What wood for a dock?
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RNeumann
Elite Member
Rustyiron
Super Member
I used locust posts cut off the property, prolly just jinxed myself. 20+ years so far.
clemsonfor
Super Member
There called marine piles. EXPENSIVE!!
I am embarrassed to admit but I can't remember the level that piles are treated too with CCA , is it something like 3.5 per cubic foot?? Above ground treated wood was like .6 I think? I could be totally wrong. I was a wood products minor, but after not useing it for 15 years you forget some things.
I am embarrassed to admit but I can't remember the level that piles are treated too with CCA , is it something like 3.5 per cubic foot?? Above ground treated wood was like .6 I think? I could be totally wrong. I was a wood products minor, but after not useing it for 15 years you forget some things.
EddieWalker
Epic Contributor
.40 is the rating for ground and fresh water contact. There is a huge jump in what you need for salt water. For above ground lumber, it's .25 percent.
Just going off memory, I believe all treated round posts are .40 and find for fresh water ponds.
I have two in my pond for a platform for a zip line that have been in there for 5 years so far and there is zero sign of decay. When I build my dock, I will use round posts from Lowes, Home Depot or McCoys for my posts. It just depends on who has the best looking posts when I decide to buy.
Just going off memory, I believe all treated round posts are .40 and find for fresh water ponds.
I have two in my pond for a platform for a zip line that have been in there for 5 years so far and there is zero sign of decay. When I build my dock, I will use round posts from Lowes, Home Depot or McCoys for my posts. It just depends on who has the best looking posts when I decide to buy.
bunyip
Elite Member
I don't know if our redgum makes it to you but it used to be stored in water to preserve it, doesn't float and doesn't rot, could be cost prohibitive if you can get it as it is very dense and heavy.
Sawyer Rob
Super Member
I've always been told that dock poles should be .80 and marine grade was 1.0...
Both are spl. order and very expensive.
.40 is for ground contact and .60 is for below grade, but both will rot in time and .40 rots easier than you would think, I hate to even buy .40 if it's near any wet ground.
SR
Both are spl. order and very expensive.
.40 is for ground contact and .60 is for below grade, but both will rot in time and .40 rots easier than you would think, I hate to even buy .40 if it's near any wet ground.
SR
bunyip
Elite Member
I recall reading an article about any timber in ground situations and that a locally sourced timber will rot whereas a timber from a different region will last longer, this was well over 20 years ago and an explanation was given but that I cannot recall, someone else may be able to shed some light on this.
I do recall that a different region was not halfway around the world but probably just a few miles away where soil conditions were a bit different.
I do recall that a different region was not halfway around the world but probably just a few miles away where soil conditions were a bit different.
3Ts
Elite Member
I think you'll find that the .4 is for CCA which is no longer available for residential use. Here's the replacement chemicals and their retention level based on application.
Pressure-Treated Wood: Types, Grading Standards & More | Decks.com
Retention Levels For Pressure-Treated Wood
Different applications impose different hazards on wood, and require different amounts of preservative for protection. These amounts are called 途etention levels, referring to the amount of preservative retained in the wood after treatment. Furthermore, each preservative has its individual retention level for these applications. Be sure to obtain wood treated for the application you have in mind. The intended use is identified on the tag stapled to each piece of lumber.
AWPA Standards
Code Preservative Name UC1, 2 UC3B UC4A UC4B
ACC Acid Copper Chromate 0.25 0.25 0.50
ACQ Alkaline Copper Quaternary (Type B or C) 0.25 0.25 0.40 0.60
ACQ Alkaline Copper Quaternary (Type A or D) 0.15 0.15 0.40 0.60
ACZA Ammoniacal Copper Zinc Arsenate 0.25 0.25 0.40 0.60
CA-B Copper Azole, Type B 0.10 0.10 0.21 0.31
CA-C Copper Azole, Type C 0.060 0.060 0.15 0.31
CuN-W Waterborne Copper Naphthenate 0.070 0.070 0.11
CX-A Copper HDO 0.206 0.206
EL2 DCOI-Imidicloprid-Stabilizer 0.019 0.019
PTI Propiconazole-Tebuconazole-Imidicloprid 0.013 0.018
PTI PTI plus Stabilizer 0.013 0.013
SBX Inorganic Boron (Formosan termites) 0.28
SBX Inorganic Boron (non-Formosan termites) 0.17
Use Category Brief Description
UC1 Interior Dry
UC2 Interior Damp
UC3A Exterior Above Ground, Coated with Rapid Water Runoff
UC3B Exterior Above Ground, Uncoated or Poor Water Runoff
UC4A Ground Contact, General Use
UC4B Ground Contact, Heavy Duty
UC4C Ground Contact, Extreme Duty
UC5A Marine Use, Northern Waters (Salt or Brackish Water)
UC5B Marine Use, Central Waters (Salt or Brackish Water)
UC5C Marine Use, Southern Waters (Salt or Brackish Water)
UCFA Interior Above Ground Fire Protection
UCFB Exterior Above Ground Fire Protection
