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Shiplap Method of Fiberglass Duct Board Fabrication

Shiplap Method of Fiberglass Duct Board Fabrication

Posted by BIP - Measurement Info Provided by Amcraft on 8th Jun 2022

Shiplap Method of Fiberglass Duct Board Fabrication

The "Shiplap Method" of fiberglass duct board fabrication creates a secure and more stable end product.  Although the results are superior to other methods, the Shiplap Method of fiberglass duct board fabrication does require a minimum of 3 tools (4 tools for 2" thick board).

The Tools Required for the Shiplap Method of Fibergalss Duct Board Fabrication:

Amcraft Orange Tool Modified Shiplap for Duct Board

Orange Tool: Modified Shiplap

1"        Board: 2 Way Tool (Cuts #2, #3 & #4)
1-1/2"  Board: 2 Way Tool (Cuts #2, #3 & #4)
2"        Board: Need to use 2 Tools

  • 2" Right Tool (#2 & #4 Cuts)
  • 2" Left Tool (#3 Cut)

Blue Tool: End-Cut Off Tool

Amcraft Black Duct Board Tool  Female Shiplap Cut


Black Tool: Female Shiplap Cut

Shiplap Method- Measurement Dimensions:

  1. Determine Total Board Length: Add all of the ID (inside dimensions) of all four sides of the finished duct + the add on.
    1. 1"        Thick Board Add On:        6-5/8"
    2. 1-1/2"  Thick Board Add On:       10-3/8"
    3. 2"        Thick Board Add On:       4-7/8"
        
  2. Draw all Lines on the Board for the cuts.  For the distance between lines, take the ID of the finished duct + the add on (see image below).  Make sure to take the add on for the correct board thickness as the add on measurements vary by board thickness.
       
  3. Use the Black or Grey Tool to cut the first (left) edge.
        
  4. Use the Orange Tool to make the cut on the 2nd line.  Cut with the #2/4 end of the tool.  There is a center line on the front of the Orange Tool's handle base, make sure to line up that notch with the line on the board.
        
  5. Use the Orange Tool (reverse the tool if a "2 Way" tool) and use the #3 end of the tool to make the third cut.  If using 2" board, use the Left Tool (#3 cut).  
       
  6. Use the Orange Tool to make the cut on the 4th line.  Cut with the #2/4 end of the tool. If using 2" board, use the Right Tool (#2/4)  
      
  7. For the last cut, use the Blue Tool (Without Shiplap & Without Skinner).  Make sure to line the center mark on the tool with the line on the board.
      
  8. Remove all scrap from the board and fold the board inwards to form the finished duct.  Take the paper from the end cut and staple/tape to the other end of the board.  Use of glass fab mesh and mastic on the seams are recommended to prevent air leakage.
      

Click Here to See the V-Groove Method Instructions