How to Properly Install AZEK Deck Boards and Rim Joists
By adrix merkado · On 8:53 am
AZEK deck and rim joist covers should be installed using the same good building principles used to install wood or composite decking and in accordance with your local building codes.
Remember that AZEK deck or AZEK rim joist covers may not be suitable for every application and it is your responsibility to make sure that AZEK deck board and rim joist covers are fit for the intended use.
It is also recommended that all applications be reviewed by a licensed architect, engineer, or local building official before you begin your installation.
As always, wear safety glasses during your deck installation.
Let’s get started:
On the Jobsite, you'll want to make sure to always store AZEK deck and rim joist covers on a flat and level surface but never stack the bundles over eight units high.
When possible, leave the protective wrap on the product to help protect it from dirt and debris and avoid storing AZEK deck or rim joist covers in areas of excess heat.
Before you begin to build your deck there are a few key things to keep in mind:
- AZEK deck and rim joist covers are one-sided products. The deck boards are to be installed with the grain side up for the walking surface and the rim joist covers are to be installed grain side out.
- Prior to installation, check to make sure all of your joists are level structurally sound, and there are no nails or screws protruding. You will also want to make sure that all joists are crowned correctly, and that all joists are level across the top as AZEK Deck will conform to the surface contour of the substructure - that means if your joists are uneven your deck may be uneven.
- Lastly, you will need to make sure your joists are properly spaced prior to installation. For correct joist spacing, you may not exceed 16 inches Center to Center for applications where the deck board will be installed perpendicular to joists. For commercial applications, do not exceed 12-inches Center to Center. If you install deck boards on a 45-degree angle such as a herringbone pattern, the joists should not exceed 12 inches Center to Center. Remember AZEK deck has a maximum span of 16 inches.
Now Let’s Get Building:
- AZEK deck boards can be installed using similar tools as you would use to install wood decking or composite decking.
- You can use a corded or cordless driver or screw gun. Self-feeding screw guns can also be used.
- To cut the deck boards, use a miter saw with fine-toothed carbide-tipped finish trim blade such as a 12-inch 60T minimum blade.
- For Fastening, due to the durability of AZEK deck products, a high-quality fastener is recommended. Fasteners should be stainless steel and at least in number 7 screw size. Face screws must be a minimum of 2 and 1/4 inches long.
- When installing face screws be sure the screws are driven to a minimum depth of 1 and 1/4 inch into solid wood framing below the bottom of the basic deck surface. You should avoid using flat head screws as trim head screws typically provide a better result. Always install two screws per joist on each deck board.
- For saltwater coastal applications, we recommend using a 3/16 stainless steel fastener in the proper size. Color-matched stainless steel deck screws are also available. Ask your AZEK deck dealer for information on these products.
- It is normal for AZEK deck and rim joist covers to experience minimal expansion and contraction with changes in temperature. This is unlike wood, whose size will fluctuate with changes in moisture.
- The expansion and contraction of AZEK deck may result in slight gaps that might be noticeable at the ends of boards or in splice joints. Fastening the deck boards properly will help minimize expansion and contraction. Keep in mind that expansion and contraction are most significant where extreme temperature changes may exist.
- The best practice is to fasten the deck boards as soon after cutting as possible. Then install the boards tightly together at splices or miters.
- Always be sure to fasten ends of boards splices or abutments to building or structure securely into framing using two screws and place those two screws within a half-inch of the end of each board or joint.
- During installation provides a 1/8-inch to 1/4-inch gap between deck boards. And for best results stagger splices and miters across deck surface, so that all splices and miters do not break on the same joist.
- To further minimize expansion and contraction allow for proper ventilation and airflow.
- Always check with your local code authority for specific requirements before installation. Some area building codes may require double joisting when joisting boards end to end.
Full Video PVC Decking installation provided by AZEK:
Share
