Installation Instructions
Table Of Contents
Rest jig on 
Base Plate –
Arrow Down
Place Clip in 
hole, hold clip 
rmly while 
installing (2) 
TEK Screws. 
Dia. #1
2
5
/
16
"
Option B - Using Lower 
Rail Clip Jig
•  Place lower rail clip jig 
(w/arrow facing base 
plate) on top of base 
plate upper edge. 
(Dia. #2)
•  Place clip in hole and 
fasten with (2) - #8x3/4" 
TEK screws.
STEP ONE – Determine necessary posts 
required and prepare (end, center or corner)
Install Lower Deck Rail Clips – Two Options:
STEP TWO - Securing Posts to Deck
Install proper post blocking as per (Dia. #3). Use proper 
attachment screws or anchors as directed below. (Deck 
screws at each post location, are not provided with kits).
•  With 3/16" drill bit, pre-drill through deck boards and 
into blocking.
•  Level and plumb post using shims.
•  Secure posts to deck with suggested screws.
•  Install post cap and post base vinyl plate cover. (Dia. #4) 
STEP THREE - Cut Deck Panels
•  Clamp or hold panel against post, adjust for equal 
end spacing. (Dia. #5)
•  Mark the top and bottom rails.
•  Cut panel 1/16" less than opening size.
•  Clean cut areas and apply touch-up paint on 
exposed ends.
Option A - When No 
Lower Rail Clip Jig Is 
Available
•  Measure 2 5/16" from 
top of casting shoulder 
and place a pencil mark 
for location of the top 
edge of the rail clip. 
(Dia. #1)
•  Center clip on post 
and secure with (2) - 
#8x3/4" TEK screws. 
Dia. #2
Dia. #3
Dia. #4
Dia. #5
FOR OTHER INSTRUCTIONS 
AND VIDEOS, VISIT
WWW.WILLIAMSRAILING.COM
Shims 
below 
base
2x6 
Blocking
4X Exterior 
Construction 
Washer Head 
Structural Screws  
(sold separately)
Cap
Square Post
Post Base Plate 
Vinyl Cover
POST-TO-SURFACE MOUNTING SCREWS:
3" Posts – Residential Deck Applications – GRK
®
 RSS
™
5/16" x 6" Grade C Yellow Zinc Washer Head Structural 
Screw
3" Posts – Residential Concrete Applications – Tapcon
®
5/16" x 3" Hex Washer Head Concrete Anchor
Deck Edge
3" Centerline
Typical
3" Centerline
Typical
Joist 
Stringer
2x6 Blocking
2x6 Cross 
Block






