What Size Compressor For Two Framing Nailers: Essential Guide

To power two framing nailers simultaneously, you’ll need an air compressor with at least a 6-gallon tank and a minimum output of 4 CFM at 90 PSI. Prioritize models offering higher CFM for consistent performance, especially for demanding jobs. A larger tank ensures fewer interruptions, letting you work efficiently.

Hey there, fellow DIYers and woodworkers! Jack Shaffer here, ready to tackle a question that pops up pretty often: “What size air compressor do I really need if I plan on running two framing nailers at the same time?” It’s a common scenario, especially when you’re building a deck, framing a wall, or working on bigger projects with a buddy. Running two nailers means more air demand, and picking the wrong compressor can lead to frustrating pauses, weak nail drives, and work stopping dead in its tracks. Don’t worry, though! We’re going to break down exactly what you need to know to choose the right compressor, ensuring your projects move forward smoothly and powerfully.

Let’s get you set up for success!

Understanding the Basics: Air Compressors and Nailers

Before we dive into specific sizes and numbers, let’s quickly cover how air compressors and framing nailers work together.

An air compressor stores compressed air in a tank. When you pull the trigger on a framing nailer, it uses this stored air to drive a nail. Framing nailers, especially the ones designed for framing, are air-hungry tools. They require a significant amount of air to operate efficiently, driving large nails deep into tough lumber.

The two key specs for an air compressor that you’ll need to focus on are:

Tank Size: This is measured in gallons. A larger tank holds more air, meaning the compressor won’t have to run as often to refill. This is super important when you need a steady supply of air.
CFM (Cubic Feet per Minute): This is the most critical measurement for air tools. It tells you how much air the compressor can deliver per minute at a specific pressure. For nailers, this is usually measured at 90 PSI (pounds per square inch).

Why Running Two Framing Nailers is Different

When you’re using just one framing nailer, the demands on your compressor are manageable. However, when you add a second user, the air consumption doubles. Imagine two people simultaneously firing nails into studs – that’s a lot of air being released at once. If your compressor can’t keep up, you’ll experience:

Low Air Pressure: The nailer might not have enough power to drive nails fully, leaving them sticking out.
Slow Cycling: The nailer might not be ready to fire again immediately after the previous shot.
Frequent Compressor Cycling: The compressor will constantly be running to try and maintain pressure, leading to overheating and noise.

However, it’s always better to have a little extra capacity than not enough. This ensures the compressor isn’t constantly straining. Therefore, for running two framing nailers, you should aim for a compressor that can deliver:

Minimum CFM at 90 PSI: 5 CFM to 6 CFM (ideally higher, like 7-8 CFM, for maximum efficiency).
Minimum Tank Size: 6 gallons. While CFM is king, a larger tank provides a buffer, allowing for bursts of air without an immediate drop in pressure. For continuous work, a 10-gallon or larger tank is highly recommended.

Check Your Nailer’s Specs: Always consult the manual or manufacturer’s website for your specific framing nailer. They will list the required CFM at a specific PSI. For example, a nailer might list “Requires 2.5 CFM @ 90 PSI.”
Add Them Up: If you have two identical nailers needing 2.5 CFM each, your total demand is 5 CFM.
Add a Buffer: It’s wise to add at least a 1-2 CFM buffer. So, for two nailers requiring 2.5 CFM each, aim for a compressor delivering at least 6-7 CFM at 90 PSI. This buffer accounts for potential air leaks, variations in nailer performance, and allows the compressor to maintain pressure more easily.

Example Calculation:

Let’s say you have two favorite framing nailers:

Nailer 1: Requires 2.2 CFM @ 90 PSI
Nailer 2: Requires 2.8 CFM @ 90 PSI

Total Minimum Demand: 2.2 CFM + 2.8 CFM = 5 CFM @ 90 PSI

Recommended Compressor Output: To have a good buffer and ensure smooth operation, you should look for a compressor that can deliver at least 6.5 to 7.5 CFM at 90 PSI.

Online Resources for CFM Information:

For general guidelines on air tool air consumption, the Tooling Europe website offers a helpful chart.
Manufacturers like DeWalt, Senco, and Bostitch provide detailed specifications for their nailers, which is crucial for accurate calculations. You can usually find these on their official product pages.

Tank Size Matters: How Much Storage Do You Need?

While CFM defines the rate at which air is delivered, tank size defines the volume of air stored. For running two framing nailers, a larger tank is incredibly beneficial.

Small Tanks (1-6 Gallons): These are generally not suitable for continuous use of two framing nailers. They will likely run out of air very quickly and require frequent refilling. A 6-gallon tank can serve as a minimum if your nailers are very efficient and your work is intermittent, but it’s not ideal.
Medium Tanks (10-20 Gallons): This is where you start to see significant improvement. A 10-gallon or 12-gallon tank offers a much better buffer. It can handle short bursts of high air demand from two nailers before needing to kick on and refill. This makes for a more consistent work experience.
Large Tanks (20+ Gallons): If you’re doing extensive framing, or if you anticipate periods where both nailers will be firing almost continuously, a larger tank is the way to go. A 20-gallon, 30-gallon, or even larger stationary compressor will provide a very comfortable air supply, minimizing downtime.

How long will you be nailing continuously? Short bursts vs. sustained nailing.
How often will both nailers be fired simultaneously?
Do you have space for a larger compressor?

Key Compressor Features to Look For:

When shopping for a compressor to power two framing nailers, consider these features:

Oil-Lubricated vs. Oil-Free:
Oil-Lubricated: Generally more durable, quieter, and produce cooler air. They are often preferred for heavier-duty use but require oil changes.
Oil-Free: More portable, lighter, and maintenance-free (no oil to check). However, they tend to be louder and can run hotter. For sustained use with two framing nailers, an oil-lubricated model might offer better longevity.
Horsepower (HP): While CFM is more critical, higher HP often correlates with higher CFM output. Look for at least 1.5-2 HP and up. Note that manufacturers often list peak or demographic HP, which can be misleading. Focus on the running HP and, more importantly, the CFM.
Dual Outputs/Regulators: Some compressors have multiple outlets, which is convenient. Even better are regulators that allow you to set precise pressure for each tool. This ensures both nailers are receiving the optimal pressure.
Portability: Are you moving the compressor around a job site, or will it stay in one place? Wheeled compressors come in handy for larger units.
Noise Level: If noise is a concern, look for models advertised as “quiet” or check decibel (dB) ratings. Oil-lubricated models tend to be quieter than oil-free ones.

Pros:
Wide range of sizes and CFM outputs available.
Generally more affordable than stationary units.
Many models are portable with wheels.
Easy to find models that meet the 4-6+ CFM requirement.
Cons:
Can be noisy.
Smaller tanks (under 10 gallons) may struggle with continuous use of two nailers.
May take longer to refill compared to larger units.
Best for: Deck building, framing additions, general construction tasks where portability is needed.

Pros:
Very portable and compact.
Relatively inexpensive.
Cons:
Very low CFM output (usually under 3 CFM @ 90 PSI).
Small tank size means rapid air depletion.
Cannot sustain the air demand of even one framing nailer for long, let alone two.

3. Twin-Stack/Wheelbarrow Compressors (10–30 Gallons)

These often offer a good balance of portability and air delivery.

Pros:
Higher CFM output than single-tank portable units.
Dual tanks can provide decent air reserve.
Often built with durable cast-iron cylinders for longevity.
Can usually be found with 5+ CFM at 90 PSI.
Cons:
Heavier and less portable than smaller units.
Can be quite noisy.
Best for: Serious DIYers, light commercial use, tasks requiring consistent air for multiple tools.

Pros:
High CFM output, easily handles multiple framing nailers.
Large tanks provide ample air reserve, minimizing compressor runtime.
Often more durable and designed for continuous use.
Cons:
Not portable; meant for a permanent location.
Higher initial cost.
Requires dedicated electrical circuits (often 240V).
Best for: Professional workshops, large-scale framing projects, running multiple air tools simultaneously.

5. Gas-Powered Compressors

These are designed for job sites without access to electricity.

Pros:
Completely portable and independent of power sources.
Often have very high CFM ratings, capable of running many tools.
Cons:
Noisy, especially the engines.
Require fuel and maintenance.
Can be heavy and bulky.
Higher upfront cost.
Best for: Remote job sites, large construction projects in areas without power.

Nailer CFM: Assume 2.5 CFM per nailer, total 5 CFM.
Recommended Compressor:
Tank: 10-20 gallons
CFM @ 90 PSI: 5-7 CFM
Type: A good quality twin-stack or a larger portable electric compressor. Look for models with durable pumps (oil-lubricated is often a good bet here).

Scenario 2: Frequent DIY or Light Professional Use (Multiple Frames, Larger Decks)

Nailer CFM: Assume 2.5-3 CFM per nailer, total 5-6 CFM.
Recommended Compressor:
Tank: 20- gallon minimum, 30+ gallons ideal.
CFM @ 90 PSI: 7-9 CFM
Type: A larger portable twin-stack, or a smaller stationary electric compressor. Oil-lubricated, cast-iron pump models are recommended for longevity and consistent performance.

Nailer CFM: Assume 3 CFM per nailer, total 6 CFM.
Recommended Compressor:
Tank: 30-gallon minimum, 60+ gallons preferred for stationary units.
CFM @ 90 PSI: 8-10+ CFM
Type: A good quality stationary electric compressor (often 240V) or a robust gas-powered compressor.

Putting it All Together: A Comparison Table

Here’s a table to help visualize the key specs you should be looking for:

| Feature | Minimum for 2 Framing Nailers | Recommended for Consistent Use | Ideal for Heavy/Continuous Use |
| :—————— | :—————————- | :—————————– | :—————————– |
| Tank Size | 6 Gallons (bare minimum) | 10-20 Gallons | 20-30+ Gallons |
| CFM @ 90 PSI | 5 CFM | 6-8 CFM | 8-10+ CFM |
| Horsepower (HP) | ~1.5 – 2 HP | ~2 – 3 HP | 3+ HP |
| Pump Type | Oil-Free (acceptable) | Oil-Lubricated preferred | Oil-Lubricated, Cast Iron |
| Job Scale | Small, intermittent tasks | Moderate, frequent use | Large, continuous work |
| Portability | High | Medium | Low (Stationary) |

Important Note on CFM Ratings: Be aware that manufacturers sometimes advertise “peak” CFM or CFM at a lower PSI. Always prioritize the CFM rating at 90 PSI. This is the standard for pneumatic tools and the most reliable figure.

Setting Up Your Compressor for Two Nailers

Once you’ve chosen your compressor, proper setup is crucial for optimal performance.

1. Read the Manual: Seriously, this is the most important step! Every compressor is slightly different.
2. Location: Place portable compressors on a firm, level surface. Ensure there’s good ventilation around it to prevent overheating. For stationary units, make sure it’s properly installed with adequate power supply and ventilation.
3. Connect Hoses: Use high-quality air hoses rated for the required PSI. For two nailers, you might want two separate hoses or a single longer hose with a manifold that splits to two outlets.
Quality Hoses: Look for hoses made of polyurethane, rubber, or PVC, rated for at least 150 PSI. Length matters too – longer hoses can cause a slight pressure drop, so try to keep them as efficient as possible. Generally, 25-50 foot hoses are common.
Manifolds/Splitters: If using a splitter, ensure it’s rated for the combined CFM. Some high-quality splitters allow for individual pressure regulation. Companies like Milton offer reliable air accessories. You can find good information on air hose types and ratings on sites like Grainger’s industrial guide to air hoses.
4. Regulate Pressure:
Nailer Requirements: Set the compressor’s regulator to the highest pressure recommended by your nailer manufacturer. This is often 90-120 PSI.
Two Nailers: If you have two outlets with individual regulators, you can set them independently. However, if using a single output and a splitter, set the main regulator appropriately.
Don’t Over-Pressurize: Running pressure too high can damage your nailers and be dangerous.

Maintain Your Tools: Keep your nailers clean and lubricated according to the manufacturer’s instructions. Worn-out or dirty nailers can draw more air or not perform efficiently.
* Check for Leaks: Air leaks in hoses, fittings, or the compressor itself can significantly reduce performance. A quick way to check is to spray soapy water on