Table 36. Preservative retention for treatment of poles (Fed. Spec. 

 TT-W-571J, AWPA C4 and C23 combined) . 





Retention by Species 1 (pcf) 











u 













rt U. 







w 







13 







rt 







(D </) 





0) 



r— i 







J= U rt 



Preservative 



•H 



3 











G.-H 



O 







rt 0) 3 





n! 



Q 





d> <D 



►JK O 





C w 





o 



C -H 



Q 





U O 





c 



■H O 



C C 





<D U 



rt 



•H 



D- CX, 



U U T3 





■J3 o 



+-> 



Oh 



<u 



O 0) c 





4-> *Ct 



w^-i 





^ bO 



■M 4-> rt 





3 C 



rt fH 



T3 



O -U 



t/1 10 i— 1 





O O 



O -H 



u 



rt o 



<U <D C 





in d- 



u u. 



C* 



►"5 J 



S S M 



Coal-tar 



7.5 to 9 3 



9 to 12 3 



10.5 to 13. 5 3 



12 to 16 



16 



Creosote 2 



12 <+ 











Pentachloro- 



0.38 to 



0.45 to 0.60 3 



0.53 to 0.68 3 



0.60 to 0.80 



0.80 



phenol in 



0.45 3 











heavy 



o^o 4 











petroleum 













ACA 



0.60 3 



0.60 3 



0.60 3 



0.60 



0.60 



CCA 



0.60 3 



0.60 3 



0.60 3 



0.60 



0.60 



detentions are for use as utility poles except for Southern, Ponderosa, and 

 Red Pines and Coastal Douglas Fir which are used for building poles as noted 

 in Footnotes 3 and 4. 



2 According to AWPA C4, creosote coal tar also may be used for utility poles. 



3 According to AWPA C23, the highest retentions are used for building poles as 

 well as utility poles. 



^Fed. Spec. TT-W-571J requires these high retentions for building poles but 

 not utility poles. 



b. Adhesives . 



(1) Field Application . At present, the use of adhesives to form or 

 assemble wood structural members is largely confined to factory production 

 of building components. Here the wood parts to be joined can be milled to 

 close tolerances and the joining and curing processes can be closely con- 

 trolled. For use in a coastal structure where they are exposed to the 

 weather or subject to immersion, a wet-use adhesive, phenol or resorcinol 

 resin or a blend of the two, should be specified for shop-fabricated members. 

 Such members have only limited use in coastal structures, primarily for such 

 items as footbridge girders and trusses, and small-craft docks in marinas. 



There is also some use of adhesives in field assembly of wood structural 

 members primarily for buildings. This use is at present largely in secondary 

 connections where a failure would not be hazardous to life or property. The 

 necessary gluing pressure is often provided by nailing. Because in-field 

 gluing and alinement of material may be much less precise, than in the shop, 

 it is necessary to use different adhesives, which, until recently, have not 



264 



