The best double stringer for an outdoor floating-style staircase depends on the deck’s rise and the stair design. The products below are paired metal stringers for supporting separate treads; the supplied details do not establish that they are engineered for cantilevered floating stairs. DIYHD offers 8-, 9-, and 10-step options for taller deck rises, while MTB and Paifnpo cover other step counts and installation needs.
| Product | Best suited for | Listed rise or steps |
|---|---|---|
| DIYHD 10-Step | Taller outdoor stair projects | 81 inches |
| DIYHD 9-Step | Intermediate-to-tall deck rises | 73 inches |
| MTB Black Steel | Buyers comparing several step counts | Options listed from 1 to 7 steps |
| Paifnpo 4-Step | Shorter deck transitions | 26.9-inch deck rise |
| DIYHD 8-Step | Outdoor stairs with a 66-inch rise | 66 inches |
DIYHD 10-Step Outdoor Steel Stringers
Best for: An outdoor stair run serving a deck with a listed height of 81 inches. This two-stringer set is suited to buyers seeking a longer steel support pair for a deck, patio, porch, or shed project.
The package includes two 10-step stringers, set screws for concrete walls, and screws for attaching wooden treads. Pre-drilled holes are intended to simplify installation. The black outdoor-grade powder coating is described as helping protect the steel from rust, corrosion, and changing weather conditions.
Important limitation: Wooden treads are not included. The seller’s instructions call for spacing the stringers no more than 3 feet apart and placing the first tread 9 inches below the deck surface. Check the actual rise and layout before ordering.
DIYHD 9-Step Outdoor Steel Stringers
Best for: Outdoor projects with a listed deck height of 73 inches. Choose this option over the 10-step model when its specified rise and step count better match the planned stair layout.
The package contains two steel stringers, set screws for concrete walls, and screws for wooden treads. Pre-drilled holes support a straightforward installation process, and the black outdoor-grade powder coating is intended to help resist rust and corrosion. The manufacturer describes the set for decks, patios, porches, sheds, and similar exterior applications.
Important limitation: Treads are not supplied. DIYHD recommends keeping the pair no more than 3 feet apart and setting the first tread 9 inches below the deck surface. Confirm that those instructions work with your design and local requirements.
MTB Black Steel Stair Riser
Best for: Buyers who want to compare several step-count choices. The listing names options ranging from 1 to 7 steps and says the item contains two metal stringers and bolts. This makes it a potential fit for projects where the rise does not call for a long 8-, 9-, or 10-step set.
The described installation sequence is to position the stringers, drill, secure them with expansion bolts, and install wooden boards. The listing also describes a triangular structure and states that it can support 3,000 pounds.
Important limitation: The 3,000-pound figure is a seller-listed claim, not a substitute for confirming project-specific structural capacity. The listing’s step-count and deck-height details should be checked for the exact option selected.
Paifnpo 4-Step Metal Stringers
Best for: A shorter transition where the listed deck rise is 26.9 inches. The product is designed for four steps and may suit a porch, patio, or replacement project where that specified rise matches the measurements.
The seller describes 4.5 mm steel, solid welds, a rust-resistant powder coating, and a stated load capacity of up to 500 pounds. The pre-drilled stringers have extra bolt holes, and the kit includes tapping screws, a drill bit, and a wrench. Those included tools may reduce the need to source installation hardware separately.
Important limitation: The 26.9-inch rise is a specific fit, not a universal dimension. Verify the rise and tread layout before choosing it, and treat the stated load capacity as a listing claim rather than a structural assessment for a particular build.
DIYHD 8-Step Outdoor Steel Stringers
Best for: Outdoor stairs serving a deck with a listed height of 66 inches. It is the shortest of the three DIYHD options here, so it is the better comparison when the project requires fewer steps than the 9- or 10-step versions.
The set includes two powder-coated steel stringers, set screws for concrete walls, and screws for attaching wooden treads. Pre-drilled holes are provided, and the coating is intended to help protect against outdoor weather, rust, and corrosion.
Important limitation: Wooden treads are not included. The listing specifies a maximum spacing of 3 feet between stringers and a first-tread position 9 inches below the deck surface. Check the selected stringer’s fit against the measured rise.
Buying Guide: How To Choose Double Stringers
What does “double stringer” mean for these products?
These listings describe pairs of metal stringers that support stair treads. They may be relevant to an open, floating-style appearance, but the provided product details do not say that the stringers create cantilevered or wall-mounted floating stairs. Confirm the intended structural design before purchasing.
How should I match the stringer to the deck height?
Measure the vertical rise from the finished lower landing to the deck surface. Compare that measurement with the product’s listed rise and step count. The options here include 26.9, 66, 73, and 81 inches, plus MTB step-count choices that need further listing verification.
What else should I check before installation?
Confirm whether the kit includes treads, fasteners, and tools; DIYHD kits do not include wooden treads. Check the required substrate, stringer spacing, attachment method, and stair geometry. Follow applicable local building requirements and consult a qualified professional if the project’s structural needs are uncertain.
Frequently Asked Questions
Are these stringers sold as a pair?
The DIYHD sets include two stringers, and the MTB listing says the item contains two. The Paifnpo details describe pre-drilled stringers but do not clearly specify the package quantity.
Do the DIYHD kits include stair treads?
No. Their listed packages include screws for attaching wooden treads, but the wooden treads themselves are not included.
Can these products be used for indoor stairs?
The supplied details emphasize outdoor use for the DIYHD models and Paifnpo product. The MTB details do not specify an indoor or outdoor application. Check the product listing for intended use before selecting one.
Are these suitable for every floating-stair design?
No such universal suitability is established by the provided specifications. These are described as stair stringers for tread support; verify that a selected product matches the engineering and attachment requirements of the planned stair design.