Pressure treated lunber
Thinking of using landscape timbers as posts for a deck railing on a 100 year old house. Landscape timbers have following information:
Residential and Agricultural Use
CA-B Pressure Treated
DO NOT CONTACT WITH ALUMINIUM
I assume it has a high arsenic content re the aluminium contact caveat.
Question is are they apt to last as long as standard 4×4 PT posts?
Let’s not confuse the issue with facts!
WHY DO I HAVE TO EXPLAIN TO FRIENDS AND FAMILY THAT BEING A SOLE PROPRIETOR IS A REAL JOB?
No arsenic. That is the reason that CCA was discontinued.
It is the high copper content that causes galvanic reaction with the AL.
"Question is are they apt to last as long as standard 4x4 PT posts?"
No. Not if they don't have a retention level listed on the label.
Landscape timbers just mean that there where laying around on the landscape will a truck with the treating chemcials drove by.
No standard on the amount of treatment that they got.
"Several typical waterborne preservatives used in building applications include: Chromated Copper Arsenate (CCA-C), Alkaline Copper Quat (ACQ-C, ACQ-D, ACQ-D Carbonate), Copper Azole (CBA-A & CA-B) and Sodium Borates (SBX/DOT)."
" Retention level refers to the amount of preservative that remains in the wood after the treatment process is complete. It is measured on a weight basis and is typically expressed as pounds of preservative per cubic foot (pcf) of wood.
There are a number of typical retention levels available. Generally, the harsher the condition the wood is exposed to, the higher the retention level must be.
For Above Ground use / exposures the following retentions are typical: (i.e. wood not in contact with soil)
0.25 pcf for ACQ & CCA-C
0.20 pcf for CBA-A
0.10 pcf for CA-B
For Ground Contact use / exposures the following retentions are typical: (i.e. wood in contact with soil)
0.40 pcf for ACQ & CCA-C
0.41 pcf for CBA-A
0.21 pcf for CA-B "
Edited 9/19/2006 8:11 pm by BillHartmann
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
WOW!!! What a Ride!
Forget the primal scream, just ROAR!!!
bet ya got the message now, aye padre'?
be wishing for the golden years of CCA once again
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Got the message, thanxLet's not confuse the issue with facts!