Hollow composite boards are not weaker than solid ones. Within the same brand, hollow and solid composite decking share the same core, encapsulation, and warranty. The only difference in how they are made is how much material the manufacturer removes from the underside to cut cost.
That difference still matters on raised decks and stairs, where the ribbed underside can show or shift. Here is what we explain to homeowners before they choose a board for their project.
What Separates Hollow and Solid Composite Decking
Every major composite brand offers an entry-level line. These boards are usually hollow, scalloped, or ribbed on the underside. Solid profile boards keep a full, flat shape from top to bottom.
Why Entry-Level Boards are Hollow Underneath
Manufacturers scallop out the underside of a board to save on material cost. Less material means a lower price, and that savings is what makes the board an entry-level option.
The Board Makeup Stays the Same
If both boards are wood-plastic composite (WPC), they are produced the same way. Within the same brand, a hollow board and a solid profile board have:
- The same core
- The same encapsulation
- The same warranty
- No difference in structural integrity
Pro Tip: Always compare hollow and solid boards within the same brand. The “same core, same warranty” rule only holds when the manufacturer is the same.
How Hollow Boards Look and Perform on Stairs
The ribbed underside has no structural effect on your deck. It does affect appearance in certain areas, and it calls for some planning on stairs.
Visible Ribbing on Raised Decks and Stair Treads
If your deck sits high off the ground, you will be able to see the ribbing or scalloping from underneath. The same goes for stairs. When stair treads are not picture framed, the scalloped edge shows on the side of each tread. A solid stringer wrap can cover those edges and give the stairs a finished look.
The Rib Count Issue on Stair Framing
Rib count varies by manufacturer. Some boards have three ribs underneath, while others have four or five.
A board with only three ribs can cause trouble on stairs. Here is how it can happen:
- The last rib sits right at the edge of the pressure-treated stair framing.
- The framing contracts over time as it loses moisture.
- The rib can slip off the framing, which creates a slight teeter in the stair tread.
A builder can prevent this by planning ahead and making the stringers a little longer to account for that contraction. With that step in place, these boards show no long-term issues.
Key Takeaway: Hollow boards perform just as well as solid boards when the stairs are built correctly. Ask your contractor how they plan the stair framing for the board you choose.
Need help picking the right composite boards for your deck? Request a bid from DW Elite Decks.
Choosing Between Entry-Level and Solid Profile Boards
We install both scalloped entry-level boards and solid profile boards, so we can walk you through the real trade-offs of each.
How We Structure Our Decking Quotes
Our quotes typically start with an entry-level decking collection. This shows you the lowest-cost option right away. From there, you can compare a mid-range or high-end board with a solid profile.
Many homeowners now choose entry-level boards. They cost less, and their look, feel, and texture have improved steadily over the years. As a result, a growing share of the market is moving toward entry-level boards over high-end lines.
Hollow vs Solid Composite Decking Side by Side
| Feature | Hollow (Scalloped or Ribbed) | Solid Profile |
| Underside | Scalloped or ribbed | Solid |
| Typical collection | Entry-level | Mid-range or high-end |
| Core and encapsulation | Same within the brand | Same within the brand |
| Warranty | Same within the brand | Same within the brand |
| Structural integrity | No difference | No difference |
| Cost | Lower | Higher |
| Appearance from below | Ribbing visible on high decks and unframed stairs | No ribbing to hide |
Pro Tip: If your deck is low to the ground and your stairs will be picture framed, the visible ribbing on a hollow board becomes a non-issue.
Get Help Choosing the Right Decking
Hollow boards save money through less material, while the core, warranty, and strength stay the same within a brand. The main things to plan for are visibility on raised decks and proper stair framing. Our team at DW Elite Decks will lay out your entry-level and solid profile options side by side, so you know exactly what you are paying for. Contact us today, and we will help you choose between hollow and solid composite decking with confidence.