Joist Hangers (7)

Joist Hanger: Your Essential Guide to Joist Hangers

Choosing the right size and type of joist hanger for a project is important to ensure the structure is secure and properly supported.

Metal joist brackets provide an economic and effective way to safely fasten joists to supporting timbers or masonry hangers via square twisted sherardized, galvanised nails, M12 bolts or coach screws. Supplied face fixed or with an adjustable wrap over hanger for a fast and effective way to securely fasten joists to beams with the reassurance of a Euroclass A1 Fire Rating. Providing the ability to spread the load over a greater area without cutting holes in walls or other timber elements, while maintaining structural stability and conforming to current UK Building Regulations

The following guide helps to provide further information relating to joist hangers, including their types, functionality, installation recommendations, and tips for optimal performance.

Table of Contents

1. How Do You Choose The Right Type of Joist Hanger?
2. What are Common Mistakes or Challenges when Installing Joist Hangers?
3. What Role do Joist hangers Play in Preventing Structural Damage or Sagging?
4. What are the Different Types of Joist Hangers Available?
5. What are Some Tips for Maintaining Joist Hangers over Time?

1. How Do You Choose The Right Type of Joist Hanger?

C&W Berry supply several different types of joist hangers that will ensure your structure is secure and properly supported. Here are the steps to help you select the right joist hanger:

1. Determine the Size of the Joist: Joist Size (Width and Depth): Measure the width (typically 1 ½ inches, 2 ½ inches, or other common dimensions) and depth (height) of the joist. Joist hangers are designed to fit specific joist sizes.
2. Material Type: Ensure the joist hanger is compatible with the material of the joist, whether it’s wood, engineered wood (like LVL or I-joists), or metal. Galvanized Steel: The most common material, providing rust resistance for outdoor and moist environments.
3. Stainless Steel: For extreme conditions, such as coastal areas with high humidity or salt exposure.
4. Zinc-Coated Steel: Provides additional corrosion resistance.
5. Determine the Load Requirements: Span and Load: Calculate the span and load that the joists will support. This will determine the capacity of the joist hanger needed. The joist hanger should be rated to handle the load the joists will carry.
6. Building Regulations: Always check your local Building Regulations or consult with a structural engineer to ensure your hanger meets the required load-bearing standards.
7. Choose the Right Type of Joist Hanger: Face-Mount Joist Hanger: These are the most common and are used when the joist is resting on a beam or ledger board. Top-Mount Joist Hanger: These are used when the joist is connected at the top of the beam, typically used in situations like deck construction. Double Joist Hanger: For situations where two joists need to be supported together (such as a large beam). Adjustable Joist Hanger: For flexibility in adjusting to slightly different joist sizes.
8. Check the Fastening Requirements: Joist hangers require the correct type of fasteners (nails or screws). Ensure you use the right length and type of fasteners for your specific hanger. Typically, nails are included with hangers, but check the manufacturer’s specifications for the correct size.
9. Manufacturer Specifications: Always follow the manufacturer's guidelines for the proper use and installation of the joist hanger. Each brand may have slightly different recommendations or sizing charts.
10. Consider Aesthetic and Practical Needs: For visible applications, consider choosing hangers with a more refined or finished look, or opt for concealed hangers if you want the connection to be less visible.

By following these guidelines, you can ensure that your joist hanger selection is safe, functional, and meets the requirements of your project.

2. What are Common Mistakes or Challenges When Installing Joist Hangers?

When installing joist hangers, several common mistakes or challenges can occur. Here are some of the most frequent ones:

Incorrect Size of Joist Hanger

• Mistake: Choosing a hanger that doesn’t properly match the size of the joist or the beam it is connecting to. For example, using a hanger that is too small for the joist or too large for the beam can lead to structural instability.
• Solution: Always ensure the joist hanger is the correct size for both the joist and the beam, and is rated for the load it will bear.

Misalignment

• Mistake: Improperly aligning the joist with the hanger, causing the joist to sit incorrectly or not fully inside the hanger.
• Solution: Double-check that the joist is centered in the hanger and sits flush with the bottom of the hanger before securing it.

Over-Tightening or Under-tightening the Fasteners

• Mistake: Using the wrong size nails or screws, or over-tightening or under-tightening them, which can cause the hanger to fail or damage the joist.
• Solution: Follow the manufacturer's recommendations for fastener size and torque. Generally, it's important to ensure all fasteners are tightly secured, but over-tightening can cause the material to deform or weaken.

Inadequate Fastening

• Mistake: Not using enough fasteners or not securing the hanger to the beam and joist properly. This can weaken the connection and create safety hazards.
• Solution: Always follow the manufacturer's instructions for the number of nails or screws required, and be sure to install fasteners into both the beam and the joist.

Improper Placement on the Beam

• Mistake: Installing the joist hanger too far in or too far out from the edge of the beam, which can affect the load distribution and stability.
• Solution: Make sure the hanger is placed in the correct location on the beam, typically at the beam’s edge, as recommended by the manufacturer or building code.

Using the Wrong Type of Hanger

• Mistake: Using a standard hanger when a specialized one (e.g., a face-mount or top-mount hanger) is needed for the specific application.
• Solution: Be aware of the type of joist hanger required for your project. Some applications require specific styles of hangers depending on the orientation of the joist and load conditions.

Ignoring Building Regulations or Load Requirements

• Mistake: Installing joist hangers without considering local Building Regulations or load-bearing requirements, which could compromise the structure's safety.
• Solution: Always check your local building codes and ensure that the hanger is rated for the loads it will carry, especially for critical structural connections.

Not Using Galvanized or Corrosion-Resistant Materials

• Mistake: Using non-corrosion-resistant hangers or fasteners in areas prone to moisture (e.g., exterior decks), which can lead to rust and premature failure.
• Solution: Use galvanized or stainless steel hangers and fasteners for outdoor applications or in environments exposed to moisture.

Forgetting to Check the Hanger’s Level

• Mistake: Installing the hanger while it is not level, which can result in uneven load distribution and structural issues.
• Solution: Use a level to ensure the joist hanger is properly aligned both horizontally and vertically before securing it.

Neglecting to Pre-drill Holes (for Certain Fasteners)

• Mistake: If using screws instead of nails, neglecting to pre-drill pilot holes, which could cause the wood to split or the fastener to not sit correctly.
• Solution: For screws, pre-drill pilot holes as needed to avoid splitting the joist or beam, and follow the manufacturer’s recommendations for installation.

Proper planning, attention to detail, and adherence to the manufacturer’s instructions are crucial when installing joist hangers to ensure the safety and structural integrity of your project. Avoid these common mistakes, and your joist hanger installation will be secure and effective.

3. What Role Do Joist Hangers Play in Preventing Structural Damage or Sagging?

Joist brackets are crucial in maintaining the structural integrity of a building by supporting the ends of joists, which are horizontal beams that help bear the load of floors, ceilings, and roofs. Here's how they help prevent structural damage or sagging:

• Load Distribution: Joist hangers ensure that the load carried by the joists is properly transferred to the structure, such as walls or beams. This helps evenly distribute weight and prevents localized stresses that could cause sagging or failure.
• Prevents Movement: They keep the joists securely in place, preventing them from shifting or pulling away from their support. Without hangers, joists could become dislodged or loose, which would lead to structural instability and potential sagging.
• Reduces Risk of Rot: By securing the joists to the framing structure, joist hangers can help prevent moisture from wicking up into the wood. This is especially important in areas prone to dampness, as excess moisture can lead to rotting, weakening, and sagging of the joists.
• Strengthens Connections: Joist hangers provide a stronger and more durable connection between the joists and the supporting beams or walls. This enhances the overall strength of the floor or ceiling system, reducing the likelihood of structural degradation over time.

In essence, joist hangers are essential for maintaining the stability and longevity of a building’s structure, preventing sagging, and minimizing the risk of serious damage.

4. What are the Different Types of Joist Hangers Available?

Joist hangers are metal brackets used to support the ends of joists and provide a secure connection between the joist and the structure (such as a beam or wall). There are several types of joist hangers available, each designed for specific applications. Here are the main types:

1. Face-Mount Joist Hangers: These are the most common type of joist hangers. They are attached to the side of a beam or wall, with the joist inserted into the hanger and secured with nails or screws. They are ideal for situations where the joists are positioned at right angles to the supporting beam or wall.
2. Top-Mount Joist Hangers: These hangers are fixed to the top of the supporting beam or wall. The joist is placed on top of the hanger and then secured and are often used in floor framing systems where the joists sit on top of the supporting structure.
3. Flush Mount Joist Hangers: These are designed to create a flush connection between the joist and the beam or wall. They are commonly used when the top of the joist needs to be level with the top of the beam and can be used when the design calls for a flush ceiling or floor finish, where the joist must align with the supporting structure.
4. Under-Mount Joist Hangers: These are installed underneath the joist, allowing it to be supported from below. They are typically used in situations where the joist needs to be supported from the underside, such as in some types of ceiling framing.
5. Angled Joist Hangers: These are used when the joists are not perpendicular to the supporting structure but rather are installed at an angle. They are often used in roof framing or other non-90-degree installations where the joists meet the supporting structure at an angle.
6. Joist Hangers for Metal Beams: These are specifically designed for use with metal or steel beams, often featuring special brackets or tabs to fit metal supports. They are suitable for use in commercial or industrial buildings where steel framing is common.
7. Truss Joist Hangers: These are designed specifically for use with engineered wood trusses rather than traditional solid lumber joists. They often have wider openings to accommodate the truss design and are used in roof or floor systems involving engineered trusses.
8. Double Joist Hangers: These are designed to support two joists side by side, often used when a wider support is needed for larger floor systems or roof framing. They are used when multiple joists need to be connected to a single beam or support, such as in heavy-duty construction.
9. Double-Sided Joist Hangers: These hangers are designed to support joists on both sides of the beam or header, providing extra stability. They are commonly used in situations where additional strength and support is required for large spans.
10. Slotted Joist Hangers: These hangers have slotted holes that allow for some flexibility in the placement of the joists. They can adjust to accommodate slight variations in joist position and are commonly used in areas where precise placement of the joists may vary slightly during installation.

Each type of joist hanger is designed to provide specific support depending on the structural needs of the project, ensuring a secure and stable framework.

5. What are Some Tips for Maintaining Joist Hangers Over Time?

Maintaining joist hangers over time is important to ensure the structural integrity of your decking, flooring, or other wooden structures. It is important to regularly inspect them for signs of wear, corrosion, or damage, especially in areas exposed to moisture. Ensure that the hangers are securely fastened with appropriate nails or screws, as loose connections can compromise structural integrity. We supply Sheradised Nails for attaching metalwork joists, hangers and straps that offer corrosion-resistance whilst the unique twisted design allows the nail to absorb movement that may occur in buildings, so structures are less likely to crack.

Applying a protective coating or rust-resistant finish can help prevent rust and corrosion, particularly in damp or coastal environments. Keep the surrounding area clean and free from debris, which can trap moisture and accelerate deterioration. Additionally, if you notice any bent or cracked hangers, replace them promptly to avoid further structural issues. Regular maintenance and attention to these details will help ensure the longevity and safety of your joist hangers.

For further technical information relating to our range of joist hangers, please telephone our main sales line on  01772 431 216 or email [email protected].