Installation Guide

Page 4
Excessive Construction Debris
It is important during construction, the deck’s surface stay
clear from excessive build-up of dirt, sand, and dust from tile,
concrete, landscape blocks, or any other masonry products. If
these materials are not removed immediately, the deck surface
will become difficult to clean and can potentially damage the
deck’s surface finish.
Do not use AZEK Deck as a work surface.
When installing AZEK Deck on a new home, best practice is to
install after all other construction (siding, roofing, painting,
etc.) is completed, otherwise permanent damage may occur.
If a build-up does occur please refer to the Care and Cleaning
section in AZEK’s installation guide or website, AZEK.com.
IMPORTANT: Do not allow airborne dust from concrete,
landscape blocks, or any masonry product to accumulate on
the AZEK Deck, Porch, Rim Joist Covers, & Riser surface as it
may damage the surface of the deck. Do not cut any product
on or near AZEK Deck, Porch, & Rim Joist Covers.
Installation Preparation
Follow these guidelines for best deck installation:
• AZEK Deck Boards are one-sided products. Deck Boards are to be installed with the grain side up for the walking
surface.
• AZEK Rim Joists Covers are one-sided. Rim Joist Covers are to be installed grain side out.
• As joists are installed, run string line frequently to ensure that the tops of the joists are in plane, as AZEK Decking
will conform to the contour of the joists to which it is attached. It may be necessary to shim or plane joists due to size
variations in lumber. Be sure to sort and exclude any extremely crowned joists/lumber material.
• Prior to installation, check to make sure all joists are level, structurally sound, and there are no nails or screws
protruding.
• Proper joist spacing is required for proper installation. Joist spacing should never exceed 16” on center. For a more
rigid feel, 12” may be preferred.
• Install solid wood blocking between each joist, placed in rows at maximum every 4’ - 6’ within the structure using
exterior grade screws. Solid blocking will help reduce up or down movement and/or twisting of joists. Limiting joist
movement can help reduce excessive gapping and also ensure a more uniform finished surface of the AZEK Deck.
16”BASIC INSTALLATION
SUBSTRUCTURE
16” on center maximum joists.
(12” on center for commercial
applications)
PICTURE FRAME INSTALLATION
SUBSTRUCTURE
16” on center maximum joists plus
additional support for picture frame
structure (12” on center for commercial
applications)
DIAGONAL INSTALLATION
SUBSTRUCTURE
12” on center maximum joists.
More severe angles may require closer
joist spacing.
1 2 3
16”
16”
12”
Working with TimberTech AZEK
®
Deck Boards