Installation Guide
866.729.2378 | www.moistureshield.com
Install MoistureShield
®
 decking using 2-1/4-inch, #7 stainless 
steel trim head screws, two screws per board per joist 
recommended. Screws should be a minimum of 1/2-inch from 
the board end.
A. Allow 1/4-inch side-to-side spacing between deck boards. 
Allow 1/8-inch (or greater) end-to-end spacing between ends 
of boards (butt joints). If installing in freezing weather, leave 
1/4-inch (butt joints).
B. Cut deck boards to fit around post. Leave 1/8-inch gap 
between board and post.
C. Staggering the butt joints on long decks usually improves 
the overall appearance of the finished deck. Some people also 
prefer a distinctive pattern for the deck boards. To achieve an 
interesting design, install a pattern board, which eliminates 
butt joints.
D. Once the boards are in place, adjust the blade depth of 
your saw to match the thickness of your deck boards. Use a 
blue chalk line to mark your cut and go. To avoid staining the 
deck boards, use blue carpenter’s chalk. Rasp the edges to 
finish.
*INSTALLATION TIPS:
· Double joist at butt joint to ensure plenty of room for  
 fasteners.
· Pre-drill using a 7/64-inch bit when too close to the 
  edge to prevent splitting. Drive screw at a slight   
  angle into joist.
3.
Slip post collar over post onto deck if installing.
*INSTALLATION TIPS:
· Router or rasp end of deck board using 1/4-inch 
  round for a finished look.
· Allow 3/16-inch overhang for any rim joist   
  imperfections (straight).
· If you choose not to use the trim board, maximum 
  recommended overhang is 1-1/2-inches.
5.
© 2015 Advanced Environmental Recycling Technologies, Inc. All trademarks are property of Advanced Environmental Recycling Technologies, Inc., unless otherwise noted. All rights reserved. June 2015.
Additionally, for a finished look, install trim boards over the rim 
joists. Position flush with the top of the decking.
A. Attach using 2-1/4-inch, #7 stainless steel trim head screws. 
One screw through the end or side of the decking, and three 
screws into the rim joist vertically. Repeat this step every 10-12 
inches horizontally through the length of the trim board. 
B. We recommend putting the screw through the thickest part 
of the deck board (center between the top and bottom of the 
board) when attaching the trim board, then the other three into 
the rim joist.
4.
*Trim can also 
be installed 
underneath boards 
when the boards 
overlap the joist.







