How Long Are Generac Anchor Bolts​

When installing a Generac generator, securing it to a concrete pad is one of the most critical steps in the installation process. One of the most common questions people ask is, "How long should my anchor bolt be?" This article will delve into the specifics of anchor bolts used for Generac generators, the types of bolts you may need, and how to determine the appropriate length for anchoring your Generac generator securely.

What Size Are Anchoring Bolts?

When considering the installation of a Generac generator, particularly a 22kW model, anchor bolts are essential components. These bolts ensure that the generator remains stable and securely mounted on the concrete pad.

Typically, the size of anchoring bolts used for Generac generators is 3/8" diameter masonry anchor bolts, which are ideal for holding the generator in place. Masonry anchor bolts are designed to work with concrete, providing the necessary holding strength to ensure the generator doesn’t shift during operation. The bolt length can vary depending on the thickness of the GenPad (composite base), the generator's mounting requirements, and the concrete pad thickness.

The Importance of Correct Anchor Bolt Size

Using the correct size anchor bolt is crucial for ensuring the stability of your generator. If the bolt is too short, it may not penetrate deep enough into the concrete to provide sufficient holding strength. If the bolt is too long, it may not secure the generator properly, causing it to shift or move.

How to Calculate Anchor Bolt Length?

To properly calculate the anchor bolt length, you must consider a few important factors:

1. The height of the composite base pad: A DTD composite base pad typically adds about 4 inches of clearance between the generator and the concrete pad. This height must be accounted for when determining the bolt length.

2. The thickness of the concrete pad: Standard concrete pads can vary in thickness. For example, standard concrete pads for Generac 22kW generators usually have a thickness between 4 inches to 6 inches. If your pad is thicker than 4 inches, you may need longer bolts.

3. The type of anchor used: Different types of anchors may require different lengths. For example, drop-in anchors, lag shields, or sleeve anchors can all require different bolt lengths based on the anchor design.

To calculate the length, take the height of the composite base plus the thickness of the concrete pad, and then add a few extra inches to ensure the bolt has enough depth to anchor securely.

For instance, if your base pad is 4 inches high and the concrete pad is 6 inches thick, you would need a bolt at least 6 inches long, but it’s wise to add another 1-2 inches for security, making a 7-8 inch bolt ideal.

How Long Should My Anchor Bolt Be?

For the most part, Generac generators require anchor bolts between 6 to 8 inches long, depending on the thickness of the concrete pad and the composite base of the generator. Here is a basic guideline to follow:

Thus, the anchor bolt length should be between 6 to 8 inches, with the diameter being 3/8 inches for most applications.

How to Secure a Generac Generator

Securing a Generac generator to a concrete pad involves several steps. Below is a basic guide on how to anchor your Generac generator properly.

1. Choose the Right Bolts and Anchors: As discussed, 3/8" diameter masonry anchor bolts are typically the best option. Drop-in anchors, lag shields, or sleeve anchors are commonly used depending on the installation design.

2. Mark the Anchor Points: Most Generac generators come with pre-drilled holes in the base, but if your generator does not, you will need to use a cardboard template to mark the position of the anchor holes.

3. Drill the Holes in the Concrete: Using a hammer drill, carefully drill the holes at the marked spots on the concrete pad. Be sure to drill deep enough to accommodate the length of your anchor bolts.

4. Install the Anchors: Insert the anchor bolts into the drilled holes. For drop-in anchors, insert them into the holes and use a hammer to set them in place. Lag shields and sleeve anchors require a slightly different installation technique, so follow the manufacturer's guidelines.

5. Secure the Generator: Once the anchors are in place, place the generator on top of the bolts and tighten the hex bolts through the generator’s base holes and into the anchor.

6. Double-Check for Stability: After installation, ensure the generator is properly secured by gently attempting to move it. If it does not shift or budge, your installation is complete.

Types of Anchoring Bolts for Generac Generators

Different types of anchoring bolts can be used to secure your Generac generator to the concrete pad, and each has its advantages.

1. Drop-In Anchors

Drop-in anchors are one of the most popular choices for anchoring a Generac generator. These anchors are ideal for masonry applications and are designed to provide a strong hold with minimal setup.

Advantages:

• Easy to install with a hammer drill.

• Provides a secure hold with no protruding parts.

• Great for concrete and masonry surfaces.

Disadvantages:

• Requires drilling precise holes in the concrete.

• Slightly more expensive compared to other types.

2. Lag Shields

Lag shields are another popular option, particularly when working with wood or masonry. These anchors allow for easy adjustment of the bolts, which is especially useful if you need to reposition the generator later.

Advantages:

• Simple installation process.

• Allows for easy bolt adjustments.

Disadvantages:

• May not be as strong as drop-in anchors in certain applications.

• Requires larger holes in the concrete.

3. Sleeve Anchors

Sleeve anchors are masonry anchors that work well for both concrete and brick. They are ideal when working with thicker concrete pads or when you need a more secure hold.

Advantages:

• Great for concrete and brick surfaces.

• Can be used in various thicknesses of concrete.

Disadvantages:

• Requires accurate drilling.

• May require additional washers and nuts.

4. Carriage Bolts

While not as common for concrete installation, carriage bolts can be used in certain applications for generator mounting. These bolts are designed to prevent rotation during tightening, making them useful in some generator installations.

5. U Bolts

U bolts can also be used to anchor the Generac generator to the concrete pad. These are commonly used when securing larger equipment to a surface and can handle heavy loads.

Installing a Generac 22kW Generator

The Generac 22kW generator is a substantial piece of equipment that requires proper installation, especially when it comes to anchoring.

Generac 22kW Generator Pad Size

The ideal size for the concrete pad that will hold a Generac 22kW generator is typically 3 feet by 5 feet. Ensure that the pad is large enough to accommodate the generator’s base, with some extra space for air circulation and maintenance access.

Generac Concrete Pad Dimensions

For Generac generators, it’s crucial to follow the Generac concrete pad guidelines to ensure proper installation. The pad should be level and stable to prevent any shifting or movement during operation. The minimum dimensions for the concrete pad are typically 4 inches thick and at least 3 feet by 5 feet in size.

Generac 22kW Exhaust Location

The exhaust location for a Generac 22kW generator should be placed in an area where it is not obstructed, and the exhaust fumes can vent freely. The exhaust typically exits from the side or back of the unit.

Conclusion

Securing your Generac generator with the appropriate anchor bolts is essential for ensuring its stability and safety. The length of the anchor bolt should be based on the composite base height, concrete pad thickness, and the type of anchor you are using.

By following the Generac concrete pad guidelines, calculating the proper anchor bolt length, and choosing the right type of fasteners, you can ensure that your 22kW Generac generator remains securely in place. Always remember to double-check the placement of your anchor bolts and test the stability of the installation once complete. Whether you're using drop-in anchors, lag shields, or sleeve anchors, proper installation is key to the long-term success of your generator setup.