October 25, 2001

Peter Jones
Twin Vee Marine, Inc.
7076 Bembe Beach Rd., 1st Floor
Annapolis, MD 21403

Dear Mr. Jones

The following is in response to your inquiry regarding the suitability of Plum Creek MarineTech^TM PTP plywood for boat building applications.

The following specification is the minimum grade recommended by APA for boat building applications:  

·         APA C-C Plugged, PS-1, Group 1, EXTERIOR plywood or plywood conforming to Industrial Category Index, (ICI) Number of 7-3-3-3. 

The four-digit ICI number consists of the following: 

·        Face Veneer Quality Ranking.  A numerical scale indicating the solidness and smoothness quality of the face veneer.

·         Back Veneer Quality Ranking.  Similar to the face veneer, the ranking addresses the back veneer quality required for the specific application.

·        Inner ply veneer under the face.  These veneers are often important for applications with heightened fastener holding demands, and where panels are going to be cut into smaller parts.

·         Other inner pies.  Similar to the veneer under the face, these are assessed for solidness. 

Plum Creek MarineTech^TM PTP plywood meets ICI Number 9-3-4-4.  This is higher than the APA recommended minimum grade.

For the best durability of plywood in boat manufacturing, APA recommends the use of treated plywood with 0.40 pcf retention, kiln dried after treating (KDAT) to 18% or less.

Please review APA’s Best Practices Guide: PRESERVATIVE-TREATED PLYWOOD FOR BOAT MANUFACTURING APPLICATIONS for additional information. (Copy enclosed) 

I hope this information will be of assistance to you.  If we can supply you with further information, please let us know. 

Sincerely,
 

MERRITT KLINE
Product Support Specialist
Technical Services Division

MPK/llh

Enc: Best Practices Guide: PRESERVATIVE-TREATED PLYWOOD FOR BOAT MANUFACTURING APPLICATIONS