How far can Trex deck span
Sophia Edwards
Published Apr 02, 2026
Most composite and PVC decking brands, like Trex and Azek, recommend a maximum joist spacing of 16 inches OC. Some brands, like WearDeck, let you get away with more – reinforced with a layer of fiberglass on both the top and bottom, WearDeck boards easily allow for spans of 24 inches OC.
How far apart should Trex deck boards be?
Important points about gapping All deck boards must always be installed with a 6mm side-to-side gap. The Trex Hideaway Hidden Fasteners automatically measure the 6mm gap between grooved edge boards but you must still ensure the 6mm gap with the square edge boards.
How far can composite decking overhang?
Overhanging composite decking is an important element to the deck’s design for aesthetic reasons and protection of the deck’s substructure. Most composite decking should overhang the deck’s substructure ¾” (18mm) but may be limited to only a 1/2″ (12mm) or as great as a 1 ½” (38mm).
How far can 1 decking span?
Decking Board Considerations Decking boards span from joist to joist. If you use 5/4 decking, joists must be no farther apart than 16 inches. Decking made of 2x4s or 2x6s can span up to 24 inches.Should you stagger Trex decking?
Composite decking should not be staggered on a deck. Staggered decking requires butt joints, but composite decking expands and contracts with temperature changes making butt joints unsightly.
How far can a 4X8 beam span without support?
Joist SpansDouglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine4X66′-2″4X88′-2″4X109′-8″4X1211′-2″
How do you hide the ends of Trex decking?
Composite decking ends can be finished by picture framing, raised fascia board, painting the ends, attaching decking veneer, composite nosing strips, vinyl stair nosing cove, composite corner trim or plastic end caps.
What is the distance between posts on a deck?
In general, posts should be spaced no more than 8 feet apart. Some builders position them every 4 feet for a completely rigid frame.How far can 2x decking span?
The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header.
Can you overhang Trex decking?» ALWAYS follow Trex-recommended gapping guidelines. » Maximum allowable perpendicular overhang for Trex is 102 mm. » All decks require air circulation to keep them dry and looking good. To improve air flow, leave openings under the decking or increase gapping to 10 mm.
Article first time published onHow far can a 5 4 deck board overhang?
The edge of decking should never overhang more than one-third of the decking material. For your standard 5.5” decking, that is 1 ¾” overhang.
How much do you overhang deck boards?
Allow for Sufficient Overhang of Decking A one to two inch overhang beyond the outer fascia board is sufficient. This means the installed deck boards should have at least 1.75 to 2.75” overhang before the fascia is installed.
How far apart should composite deck clips be?
Check the decking specifications and local building codes for joist spacing. The most common is 16 inches on center. For a more rigid feel, 12 inches on center. Install blocking between each joist every four to six feet to reduce movement up and down and twisting of the joists, using exterior screws.
How far do I space deck boards?
Proper wood deck board spacing should have at least a 1/8 inch gap after the decking has dried out. If you install your wood or treated deck boards while they are still wet boards, then they should be attached without a gap between them.
Can you screw down Trex decking?
The answer is yes for a solid composite decking (must be pre-drill and must check with manufacture). You can not drill or screw through a hollow composite deck as the screw will become loose and rise in time . Like the usual wooden decking boards, you can also screw down a solid composite decking.
How do you stagger Trex decking?
“Stagger your boards so their ends are in different spots.” Slide the next board in so it’s parallel to the first. The sliding motion is important, as you want the spacer to fit in the groove of this board, too. Basically, you’ll have two boards with the spacer between them.
How do you hide the Trex grooved edge?
Install Fascia Boards Installing fascia boards is a common practice to hide the ends of composite decking boards. Like picture framing, it gives the decking a stylish and sleek look while hiding the exposed ends. The difference is, you will install it on the sides, directly over the edges and the rim joists.
How big of a beam do I need to span 20 feet?
Wood beam size for a 20 foot span:- as per general thumb rule, for a 20 foot span, size of wood beam or lumber joist should be 2×14 which placed at 16″ apart from centre used for residential building or projects or construction in which depth of section of beam is 350mm (14″) and width of beam is 50 mm or 2″.
What size beam can span 16 feet?
In general terms, joist or beam which spaced 16 inches apart on Centre can span 1.5 times in feet their depth in inches. A 2×10 can span upto 16 feet.
What size beam do I need for a 12 foot span?
A double ply beam can span in feet if there is no overhang beyond it. A double 2×12 beam can span 12 feet, a double 2×10 can span 10 feet, and so on.
What size beam do I need to span 24 feet?
For 24 foot span, size of simply supported beam for 2-3 storey residential building, using thumb rule, is about 15″×18″ in which beam width is 12″ and beam depth is 15″, if width will be kept 12″, depth should increased, then beam size 12″×24″ can be used, providing with 4nos of 16mm bar at top, 4nos of 20mm bar at …
How far can a double 2x6 span without support?
How Far Can a Double 2×6 Beam Span? A double 2×6 southern pine beam can span a maximum distance of 6 feet 8 inches when supporting joists that span 6 feet, according to International Residential Code.
Are 2x6 strong enough for deck joists?
For upper-level decks, 2×10 is recommended as the minimum size to use for strong guard post connections. 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. … Most decking is not strong enough to support longer spans than 16″.
What is deck fascia?
(“Deck Fascia,” “Deck Fascia Board,” “Rim Joist Cover”) On a deck, fascia refers to the boards used to cover the end cuts and/or rim joists, installed bordering the deck surface (below, left).
What is a deck overhang?
If the deck joists extend past the beam, they create a cantilever — an overhanging section of deck.
How much should a T Rex overhang?
Trex is a popular composite material with a maximum overhang of 102mm or around 4 inches. Between one and two inches of deck board overhang is ideal when you attach an outer fascia board, or at least 1 ¾” to 2 ¾” of overhang before installing the fascia.
How much Trex expand and contract?
For Trex decking, the recommended end-to-end and side gaps range from 1/8 inch to 3/16 inch, depending on the temperature during installation. The gap against the permanent structure ranges from 1/4 inch to 1/2 inch, depending on the installation temperature.
How far can 2x6 deck boards overhang?
So, for example, a 2×6 deck board could easily extend 11/2 inches beyond the edge of the supporting joist.
What is the thickness of Trex fascia?
ColorsGravel Path, Havana Gold, Island Mist, Lava Rock, Rope Swing, Spiced Rum, Tiki Torch, and Vintage LanternCompatible FastenersConsult installation instructions and/or warranty informationLengths Available12 ftNominal Dimensions (width x thickness x length)12 in x 1 in x 12 ft
How do you finish the edge of a deck?
- Picture Framing. The picture framing method is an excellent way you can finish a wood-plastic decking edge. …
- Raised Fascia Boards. …
- Paint the Composite Decking Edge. …
- Use Veneer Cap. …
- Screw End Strip to Edges. …
- Vinyl Stair Nosing. …
- Composite Corner Trim. …
- Plastic Ends Caps.
How do you secure the last piece of composite decking?
Position the clip on the outside of the rim joist securing it with a single screw inserted perpendicular to the joist. After positioning the last deck board in place, secure it by angling a screw through the clip and into the board at a 30˚- 45˚ angle.