WHAT TO KNOW BEFORE YOU BUILD
Design Details >
This guide assumes the use of grooved 5.5" deck boards and 1/8" spacing in a straight, edge-to-edge pattern.
Fascia Details >
The fascia boards will be installed flush with the deck boards to cover the ends and polish the look of your build.
Railing Details >
TimberTech PRO & EDGE Decking Installation Guide
Estimated based on a 12' x 12' deck; time will vary depending on the size of deck and complexity of the build.
- Safety glasses
- Power miter saw
- Jig saw
- Cordless driver
- Measuring tape
- Carpenter square
- Deck spacer or spacing tool (optional)
- CONCEALoc® Fastening System
- Cortex®, TOPLoc™, or a minimum #8 x 2-1/2” stainless steel or other high-quality coated composite deck fasteners
Many other tools are available that can be used for installation. All tools should be used per applicable manufacturers’ instructions.
Step 1: Best Practices for Cutting PRO & EDGE Deck Boards
For cutting TimberTech PRO and EDGE deck boards, make sure to use an appropriate saw.
NOTE: Do not use cordless saws.
Power Miter Saw
FOR CUTTING PRO BOARDS:
Use a miter saw with a fine-toothed, carbide-tipped finish trim blade (12” 100-tooth or 10” 80-tooth minimum).
FOR CUTTING PRO BOARDS:
Use a fine-tooth blade.
Electric Circular Saw
FOR CUTTING AROUND RAIL POSTS:
Use a 60-tooth fine-finish blade.
- Use proper saw and blade.
- Cut boards one at a time.
- Cut deck boards with the grain facing upward.
- While using any saw, use slow cuts or chipping can occur.
- Do not use battery-powered saws, as chipping can occur.
- As with any wood or alternative decking product, always be sure to cut the factory ends of your board for a clean and square finish.
- Make sure the face of the deck board is protected from the bottom of the saw during cutting with a circular saw or a jig saw.
- If using a circular saw, be sure to use a saw guide for clean, square cuts.
- For best results, cut boards before installing / fastening or chipping can occur.
- As always, measure twice and cut once.
Step 2: Best Practices for Fastening PRO & EDGE Deck Boards
Due to the durability of TimberTech PRO and EDGE deck products, a high-quality fastener is recommended. Recommended fasteners include:
- TimberTech CONCEALoc hidden clip fasteners
- TimberTech TOPLoc composite deck fasteners
- TimberTech TOPLoc fascia fastening system
- Cortex, TOPLoc, or a minimum #8 x 2-1/2” stainless steel or other high-quality coated composite deck fasteners
TimberTech does not recommend any fastener that is not explicitly stated in the TimberTech Decking Installation Guide. Use of any alternative fastener does not void the TimberTech warranty; however, if a decking failure is caused by using one of these alternative fastening methods, any corresponding claims will be denied.
CONCEALoc Fastener Clip & Provided Fasteners
For even faster installation.
Always position fastener screw hole with the center of the joist.
Drive screw at a 45° angle while applying pressure. The connection point of the next grooved board will be against the fasteners within the curvature of the CONCEALoc hidden fastener clip.
Spacing Between Boards
Spacing between boards should be 3/16”. The use of a spacer could add efficiency and help maintain proper spacing.
FOLLOW PROPER SPACING & GAPPING
Side-to-side board gapping must be a minimum of 1/8" to a maximum 3/16". Allow a 3/16" minimum gap where the board meets any adjoining structure or post. Follow proper butt joint gapping guidelines for TimberTech PRO and EDGE deck boards.
Step 3: Best Practices for Fastening PRO & EDGE Fascia Boards
Due to the durability of TimberTech PRO deck products, a high-quality fastener is recommended. For best results, use:
- TOPLoc fascia fastening system featuring color-matched fasteners
TOPLoc Fascia Drill Bit
TOPLoc for TimberTech
Step 4: Determine Where to Start Laying Boards
The design and size of your deck will determine the number of boards required to install TimberTech PRO and EDGE decking.
Deck plan includes all full-width boards (no partial / cut / ripped down boards). You may want to start at the house and work outward for ease.
Deck plan will require cutting / ripping down a board or boards. You may want to start away from the home and work inward so the off-sized board is closer to the house / hidden.
RIPPING OF BOARDS MAY BE REQUIRED
Cutting a board along its horizontal edge, or "ripping”, may be required to achieve full coverage of the framing.
BUTT JOINT GAPPING REQUIREMENTS
32 °F & Below
33 to 74 °F
75 °F & Above
Step 5: Install TimberTech PRO or EDGE Decking
First and Last Grooved Board
Pre-drilling is required when within 1-1/2" of the ends of the board and for temperatures below 45 °F to avoid end splitting and screw shear.
Pre-drill as defined below based on your selected fastener.
- Pre-drill with a 5/32” drill bit for TOPLoc fasteners or a #8 x 2-1/2" stainless steel or other high-quality coated composite deck screw.
- Cortex installations require a 3/16” pre-drill at all fastener locations.
Best Practices For
Composite Deck Board Installation
As you go, make sure:
- Each fastener is in full contact with the edge of the deck board.
- The screw is holding the fastener down tight to the joists.
- You install one fastener and one screw at each joist.
Your CONCEALoc Fastener
- Fully insert the CONCEALoc fastener into the grooved edge of the plank.
- Press the clip downward to engage the teeth into the top of the groove.
- Place the next board into position against the fasteners. Slightly raise the outer edge of the board being installed and slide it onto the fastener until the board contacts the spacer tab.
Best Practices For
Butt Joint Detail
You will use FOUR CLIPS PER JOINT; TWO ON EACH SIDE OF THE DECK BOARDS.
- Insert the board on the right side of the splice, fully seated on a 1-1/2” joist with one full clip designated for this side.
- Each board end at the butt-joint splice has two clips, one on each side of the board, fastened to a full 1-1/2” joist / block.
- This means there are four clips at a butt-joint splice: two clips for the left side board, and two clips for the right side board, for a total of four.
FOR A COMPLETELY FASTENER-FREE SURFACE
Use the L-bracket or Cortex fastening system on the first and last boards.
Cortex isn't compatible with PRO Terrain, EDGE Prime, or Prime+ products. See the installation guide for restricted Cortex uses.
1. Insert Fastener
Insert the CONCEALoc fastener into the grooved edge of the deck board.
2. Drive Screw
Drive the screw at a 45-degree angle in the center of the joist.
Drive clip until it is flush against the joist.
1. Fasten Board
Ensure fastener is in proper position.
2. Check Your Board
Place the next board into position against the fasteners. Raise the outer edge of the board being installed and slide it onto the fastener until the board contacts the spacer tab.
3. Secure Your Board
When properly installed, the inserted board should be in contact with the bent-forward spacer tab at the left end of the clip.
DO NOT USE A HAMMER
When installing your TimberTech PRO or EDGE deck, do not use a hammer or damage to the edge of the board will occur. Use a beater board such as a wooden 2x4 board at least 24" long to gently tap the TimberTech board tight to clip spacing tab if necessary. The screw will fully engage the board to the spacer tab if not already in contact.
BUTT JOINT INSTALLATION
Determine where butt-joint splices will be located. You may use a 'double joist’ technique or add a 'sister joist block' to create a full 1-1/2” against which each board end can rest and for proper CONCEALoc clip attachment.
Double up your joists at butt-joint splices.
Make sure you offset the clip on the right side of the joint 1/4" from the center line.
Step 6: Install TimberTech PRO or EDGE Fascia Boards
- Safety glasses
- TOPLoc fascia fasteners
- TOPLoc fascia drill bit (sold separately)
- T20 driver bit (included)
- Tape Measure
Measure the length of your joist and cut the fascia board down to size if necessary; the goal is to hide the outside of the rim joist. Using the TOPLoc Fascia Bit, pre-drill 2" from the top and bottom, alternating a maximum of 12". It is recommended that fasteners are evenly spaced for the cleanest look.
Position Your Board
Position the fascia board so it is flush with the top of the deck boards.
Pre-drill 2” from the top and bottom, alternating between the two at a maximum of 12”. Do not drive fasteners into ends or edge of deck boards or splitting of deck board can occur.
Drive the Fasteners
Fasten in the pattern described above, working in one direction.
DO NOT COMPLETELY TORQUE DOWN THE FASTENER
The screw should serve as a hanging mechanism to allow for expansion and contraction in the fascia.
FASCIA FASTENING BEST PRACTICES
Ensure Proper Connection
- Each fastener must be in full contact with the edge of the fascia board, with the screw holding the fastener down tight to the board.
- Install three fasteners from top to bottom. Top and bottom fasteners should be 1/2" from the edge, and the third screw centered.
- Repeat this configuration every 12."
- Continue fastening in the pattern described above, working left to right or right to left. This will ensure flatness in the fascia.
Position and Rip-Cut as Needed
- Measure the length of the outside rim joist to determine the length of PRO or EDGE fascia board.
- It may be necessary to rip-cut the fascia board to fit the outside rim board of the deck. A slight overhang is permitted, with the goal being to hide the wood rim joist.
- If the fascia or rim board requires "ripping down," make sure that the cut edge is positioned down, not up, which exposes the core material.
- Place factory edge / cap stock edge up and flush with the deck surface.
The techniques shown should be used for best results. Results may vary, as expansion and contraction could still occur. AZEK Building Products Inc. claims no liability or responsibility for the improper installation of this product. Since all installations are unique, it is the sole responsibility of the installer to determine specific requirements in regard to each decking application. AZEK Building Products recommends that all designs be reviewed by a licensed architect, engineer or local building official before installation. Please contact AZEK Customer Service prior to installing if you have question or concerns.
Step 7: Prolong the Aesthetics of Your Deck
While TimberTech PRO and EDGE capped composite decking is specifically engineered for enduring beauty, it's always wise to keep your backyard build free of dirt, debris, and spills. To maximize the aesthetics of your deck, we recommend using TimberTech® DeckCleaner™.
USE THE APPROPRIATE BRUSH
When cleaning your TimberTech decking with DeckCleaner, use a medium-to-stiff nylon brush.
For full details on keeping your capped composite deck looking as great on day 1,000 as day 1, read more over on Care & Cleaning.