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The best exterior nails and screws depend on the wood, preservative treatment, exposure, connection and connector—not on a single fastener being right for every project. For treated lumber, start with compatible hot-dip galvanized or stainless steel fasteners; for cedar or redwood siding, use stainless steel; and for coastal, salt-spray or continuously wet locations, Type 316 stainless is the safest default when compatible with the connector and project requirements. Use screws or bolts for exposed structural connections when the design calls for them, and use nails for permitted, less-critical work such as decking or siding.
Before buying, confirm the lumber’s treatment, fastener material and coating, required length and embedment, connector instructions and local code. The guide below compares the main choices by use case and explains where common substitutions can cause corrosion, staining or a weaker connection.
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| Name | Best for | Key spec | Checked |
|---|---|---|---|
| Type 316 stainless steel nails, screws or bolts | Coastal, salt-spray, severe or continuously wet exposure; severe exposure with treated wood | Highest-priority choice for corrosion resistance in the cited guidance; verify compatibility with the connector and code | November 2026 |
| Hot-dip galvanized fasteners | Many exterior applications with compatible pressure-treated lumber | For CA-C and CA-B wood, the cited guidance specifies hot-dip galvanized ASTM A153 or Type 304/316 stainless | November 2026 |
| Type 304 stainless steel siding nails | Western red cedar and redwood siding in general exposure | Use stainless to reduce corrosion and staining; choose nail length for at least 1¼ inches of penetration into solid wood | November 2026 |
| Type 316 stainless steel siding nails | Cedar or redwood siding at the seacoast | Western Red Cedar Lumber Association guidance recommends No. 316 for seacoast exposure | November 2026 |
| Screws and bolts specified for the connection | Exposed structural connections, including important ledger and guard-post connections | Follow the design, connector label and local code for fastener type, size and quantity | November 2026 |
| Hot-dip galvanized or stainless nails | Permitted, less-critical decking and siding work | Nails install quickly; use only where the design and connector instructions allow them | November 2026 |
This is a use-case ranking, not a universal performance league table: the most corrosion-resistant option is not automatically the correct fastener for every wood treatment, connector or structural detail. Prices and market availability are not compared because the cited guidance does not establish them.
What makes an exterior fastener the right choice?
The right fastener must suit both the environment and the job it is doing. A nail that works on an ordinary siding detail may be unsuitable for a structural connection; a stainless screw may resist corrosion but still be the wrong choice if the connector instructions specify another fastener. Treat wood chemistry, exposure, structural role and metal compatibility as a single decision rather than choosing by the word “exterior” on a package.
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Exterior fasteners face moisture and weather, and treated lumber can add preservative chemicals that interact with metal. Corrosion can damage the fastener and may also mark the wood. At a connection, the fastener must also match the connector system and satisfy the design and local code. A useful starting question is not “Which screw lasts longest?” but “Which approved fastener is compatible with this wood and this specific connection in this exposure?”
There is no supported universal service-life comparison among the options in this guide. Coating names alone do not establish how long a fastener will last in a particular project. Choose from the lumber-treatment maker’s approved fasteners, the connector maker’s instructions and the applicable design or code requirements.
Which fasteners should I use with pressure-treated wood?
Use the fastener types approved for the specific preservative treatment. Hot-dip galvanized fasteners meeting the applicable requirement or Type 304/316 stainless steel are common options in the cited guidance; ordinary electroplated galvanized fasteners generally are not an acceptable exterior substitute for treated-wood use.
“Pressure-treated” does not identify one universal preservative formulation. For CA-C and CA-B wood, Treated Wood’s fastener guidance specifies hot-dip galvanized fasteners meeting ASTM A153 or Type 304/316 stainless steel, and says electroplated galvanized fasteners are typically not accepted for exterior use. Check the lumber documentation or ask the supplier which treatment was used rather than assuming all treated products have the same requirements.
For exterior micronized-copper treated wood, YellaWood’s fastener information lists hot-dip galvanized ASTM A153, epoxy-coated carbon steel, and Type 304, 305 or 316 stainless steel. It recommends stainless for severe exposure and requires stainless fasteners for permanent wood foundations below grade. These allowances apply to the product guidance cited; they do not override a connector label, design specification or local code. If instructions conflict or the treatment is unclear, get direction from the lumber or connector manufacturer before fastening.
Do not treat “galvanized” as a precise specification. Hot-dip galvanizing and electroplating are different finishes, and the cited treated-wood guidance distinguishes them. Read the package for the coating process and applicable standard, not merely a general corrosion-resistant claim. An unqualified electroplated fastener is not the same selection as a hot-dip galvanized ASTM A153 fastener.
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Is stainless steel better than hot-dip galvanized outside?
Neither material is best for every exterior project. Stainless steel is the stronger default in severe exposure, particularly Type 316 near salt spray or in continuously wet conditions; hot-dip galvanized fasteners are suitable for many exterior treated-wood applications when the treatment and project requirements permit them.
Stainless is not one interchangeable grade. Type 304 is recommended for general cedar siding exposure, while Type 316 is recommended for cedar siding at the seacoast. The broader guidance also identifies Type 316 as the safest default for coastal air, salt spray, severe exposure or continuous wetness. That is a corrosion-resistance choice, not permission to ignore connector compatibility or the structural design.
Hot-dip galvanized fasteners can be an appropriate, often practical choice for compatible treated lumber. For example, the cited guidance accepts ASTM A153 hot-dip galvanized fasteners for specified treated-wood applications. But a generic “galvanized” label leaves an important question unanswered: was the fastener hot-dip galvanized to the required specification, or electroplated? Confirm both material and coating before purchase.
Do not infer a precise lifespan or a universal ranking from these categories. Exposure, preservative chemistry, fastener specification, installation and the connected metals all matter. If the site is coastal or persistently wet, follow the most corrosion-resistant compatible option specified for the full connector system.
What nails should I use for cedar or redwood siding?
Use stainless steel nails to reduce corrosion and staining on cedar or redwood siding. The Western Red Cedar Lumber Association recommends No. 304 stainless for general exposure and No. 316 for seacoast exposure.
Its Western Red Cedar installation guidance identifies stainless-steel nails as the best choice for Western red cedar. It favors splitless ring-shank siding nails and says the fastener must penetrate solid wood by at least 1¼ inches. That measurement is penetration into solid wood, not the nail’s total length: account for the siding thickness and any other layers between the fastener head and the solid wood when determining the required nail length.
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Ring shanks and the stated penetration guidance address the siding application; they do not make every nail appropriate for every siding detail. Follow the siding and building-system instructions for placement and installation, and check local requirements. For redwood, the available data supports using stainless to reduce corrosion and staining; the specific No. 304/316 exposure recommendations cited above are from the Western Red Cedar Lumber Association’s guidance for Western red cedar.
A finish-coated or galvanized nail may seem like a convenient substitute, but the cited cedar guidance recommends stainless. If the siding is coastal, choose the No. 316 grade rather than treating No. 304 as interchangeable.
Should I use deck screws or nails?
Use the fastener specified for the deck component and connection. Screws or bolts are generally the better fit for exposed structural connections when the design calls for them; nails can be suitable for less-critical decking or railing-picket work where the design permits them.
BC Housing’s guide to safe and durable wood decks and balconies distinguishes structural connections from less-critical fastening: it says exposed framing members are best secured with screws and bolts, and recommends lag or through bolts for important ledger and guard-post connections. It identifies nails as suitable for less-critical decking and railing pickets where the design permits them. These are not interchangeable permissions to substitute fasteners in a built deck. Follow the connection design and connector instructions.
There is also a practical installation trade-off. Grip-Rite’s fastener selection guide summarizes nails as quicker to drive, while screws provide a tighter fit, a neater appearance and easier removal with relatively less damage. These general trade-offs help with nonstructural choices; they do not establish that a screw is structurally approved wherever a nail is specified, or vice versa.
For a nail-gun project, the fastener still needs to be the correct material and specification for the treated wood and exposure. For a driver-installed screw, check the connector or design documentation just as carefully. Installation convenience is secondary to using the required fastener type, size, quantity and compatible metal system.
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What should I use near the coast or in continuously wet conditions?
Choose the most corrosion-resistant fastener that is compatible with the wood treatment and connector; Type 316 stainless is the safest default in the cited guidance for salt spray, coastal air, severe exposure and continuous wetness. Do not decide on the fastener alone: a dissimilar connector can create another corrosion risk.
FEMA’s coastal connector guidance says nearshore areas need more corrosion-resistant materials and recommends stainless fasteners with preservative-treated lumber. The source does not supply one universal coastal distance or service-life guarantee for every project, so assess the actual exposure and follow the project and manufacturer requirements.
Use compatible metals for the fastener and connector. Guidance from BC Housing, the University of British Columbia and treated-wood sources calls for matching metals in the fastener-and-connector system to limit galvanic corrosion. A stainless fastener paired with an incompatible connector is not automatically a complete corrosion-resistant assembly. Check both components’ labels and instructions, especially when replacing a fastener or connector in an existing structure.
For exposed framing, structural adequacy still comes first. A more corrosion-resistant fastener does not automatically have the capacity, geometry or approval required for a ledger, guard post or other connection. Select the connection as a system: correct material and coating, connector compatibility, size and quantity, and required installation.
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Can I use aluminum connectors with treated wood?
Not without checking the treatment-specific compatibility guidance. Direct contact between aluminum and CA-C or CA-B treated wood is warned against unless an approved membrane separates them; other treated-wood formulations can have different, conditional allowances.
Treated Wood’s compatibility information warns against direct aluminum contact with CA-C or CA-B wood without an approved membrane. YellaWood’s guidance allows some above-ground micronized-copper applications only under drainage, moisture, code and manufacturer conditions. The difference is a reminder to identify the product and treatment rather than assuming one rule covers all treated lumber.
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When aluminum is involved, check the exact lumber treatment, connector instructions, approved membrane requirements and conditions of use with the relevant manufacturers. Do not assume that a compatible screw makes direct contact between a connector and lumber acceptable, or that an allowance for above-ground use applies below grade or in a wetter detail.
How do I choose fastener length and confirm a connection?
Start with the required connection and work backward to the fastener specification. Confirm material and coating, connector compatibility, fastener type, length, embedment, size and quantity; then verify that the choice follows the project design, manufacturer instructions and local code.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minute- Identify the wood and treatment. Record whether the material is untreated, pressure-treated, cedar or redwood, and obtain the preservative details where applicable. “Pressure-treated” alone may not be enough to choose a coating.
- Assess exposure. Note whether the assembly is inland or near the coast, exposed to salt spray, continuously wet, or otherwise in severe conditions. Use the exposure to inform the corrosion-resistance choice, not to replace product requirements.
- Classify the connection. Determine whether it is a structural connection, such as a ledger or guard post, or a less-critical fastening detail such as decking or railing pickets. For structural work, use the specified connection rather than a convenient substitute.
- Identify every metal in the assembly. Check both fastener and connector materials and their approved compatibility with the lumber treatment. If aluminum contacts treated wood, verify whether the treatment guidance requires a membrane or limits the application.
- Read the connector label and design. Confirm fastener type, diameter or size, length and quantity exactly as specified. A product that is corrosion-resistant may still be incompatible with the connector or not approved for that connection.
- Check required embedment. Determine how much fastener must enter sound, solid wood, allowing for the thickness of the siding or other layers. For the cited Western red cedar siding guidance, penetration into solid wood must be at least 1¼ inches.
- Confirm code and product instructions before buying. If the treatment, connector or required fastener is uncertain—or the guidance appears to conflict—ask the lumber or connector manufacturer or a qualified building professional. Do not resolve the ambiguity by choosing a larger or more corrosion-resistant fastener on your own.
Fastener length is not a stand-alone measure of connection quality. The connector’s specified fastener, required embedment and installed quantity all matter. A long screw that is not the listed type may be an incorrect substitution, and the 1¼-inch cedar siding penetration rule should not be generalized to a deck ledger or another structural connection.
How we picked these exterior fastener options
The options are organized by the use cases supported by the cited building, treated-wood and manufacturer guidance: treated lumber, cedar siding, coastal or persistently wet exposure, and exposed structural connections. The ordering puts the most demanding corrosion exposure first, then presents common material and application choices. It is not a claim that one fastener is universally best or that the options have a measured service-life ranking.
The selection criteria are preservative compatibility, resistance to the stated exposure, risk of cedar staining, structural versus finish role, nail-versus-screw suitability, required embedment and compatibility between fastener and connector metals. The cited material provides application recommendations and specifications, but not a universal cost comparison or a reliable service-life comparison among coatings. For a real project, the final choice is the compatible fastener named by the lumber guidance, connector label, design and local code.
Frequently Asked Questions
Can I use ordinary electroplated galvanized screws in pressure-treated lumber?
Do not assume they are suitable for exterior treated-wood work. The cited guidance for CA-C and CA-B wood says electroplated galvanized fasteners are typically not accepted for exterior use; verify the specific treatment and use an approved fastener specification.
Do I need stainless steel nails for cedar siding?
Stainless is the recommended choice in the Western Red Cedar Lumber Association guidance because it reduces corrosion and staining risk. That guidance names No. 304 for general exposure and No. 316 for seacoast exposure.
Can I replace a deck connector’s specified nails with screws?
Not unless the connection design and connector instructions allow the substitution. A screw’s general advantages—such as easier removal—do not show that it has the required capacity or approval for a connector designed around another fastener.
Does a more corrosion-resistant screw make an aluminum connector safe on treated wood?
No. Connector-to-wood compatibility is a separate issue from fastener corrosion resistance. Check the exact preservative treatment and manufacturer guidance; some applications require an approved membrane or are limited by moisture and location.
