Add A Mezzanine Floor To Maximize Your Metal Building Space

Have you ever wanted more space in your metal building without expanding its footprint? Whether you are planning a new steel structure or already have one, running out of room can be frustrating. Luckily, there is a simple solution – a mezzanine floor!

In this blog, we will explore what it is, how it can double your usable space, and the best way to plan for it. We will break down the step-by-step process of how to install and plan for a mezzanine. So, let's dive in and unlock the full potential of your steel garage building.

What Is A Mezzanine Floor?

A mezzanine is an extra floor inside your building, adding more space without making it bigger on the outside. It's great for storage, offices, workshops, or a comfy lounge. Instead of expanding outward, you build upward to use the vertical space you already have.

Why Add A Mezzanine Floor To Your Metal Building?

A mezzanine flooring is a versatile space that can add usable space inside your steel prefab structure without increasing your land footprint. You can use it for –

• Storage (seasonal items, tools, and equipment)
• Office space (a quiet area for working)
• Workshop expansion (more room for finished projects and supplies)
• Hobby or lounge area (cozy spot for relaxing and personal activities)
• Sleeping area (ideal for cabins or metal Barndo with extra bed)

Ideal Building Height For A Mezzanine Floor

Your metal prefab structure must be tall enough to accommodate a mezzanine floor that can be used as a multi-purpose space. You can consider –

• Headroom Below the Floor – about 8 to 9 ft., so that you can move comfortably.
• Headroom Above the Floor – about 7 to 8 ft., so you can stand without bumping your head into the ceiling.
• Building's Eave Height – Opt for a metal structure with a height of at least 18 to 20 ft. to accommodate the mezzanine. The best part is that you can have about 20 ft. tall metal residential garages in most places and up to 80 ft. or more high steel buildings for commercial use.  

A good rule of thumb is to place the mezzanine about halfway or slightly above the halfway point up your interior wall height so you can move comfortably on both levels.

Step-By-Step Guide To Add A Mezzanine Floor To A Steel Structure

Here is the step-by-step process for installing a new floor in your steel prefab structure.

Step 1: Get Your Plan Approved

Before you pick up that power tool, it is best to check your local building codes since some areas may require a permit to build a mezzanine. You may need a structural engineer to assess the strength of your steel structure by –

• Checking if the steel frame can handle extra weight.
• Ensuring the foundation is strong enough to support a mezzanine.
• Getting approval to avoid legal issues later on.

Once you get the 'green light,' you can move to step 2.

Step 2: Choose The Right Mezzanine Design

Think about how you are going to use this space. You can choose between –

• Full mezzanine – covers most of the building, like a second level.
• Partial mezzanine – covers a part of the internal building, leaving an open area below.
• Open mezzanine – ideal for storage or workspace.
• Enclosed mezzanine – ideal if you want privacy for offices or a quiet room.

Step 3: Gather Materials

You will need strong and durable materials that can bear dead loads for safety.

• Main Support (steel beams or heavy-duty lumber)
• Joists (for supporting flooring)
• Plywood or OSB (for a solid walking surface)
• Metal Decking (for extra durability)
• Essentials (fasteners, screws, brackets, stairs, ladders, railing, etc.)

Step 4: Mark And Install Main Supports

Mark the height of your mezzanine on the metal walls and attach ledger boards/ brackets to the existing steel frames. Now, install support beams and columns that will hold the mezzanine in place.

Tip: Spacing matters. So, keep the beams spaced evenly for stability and aesthetics.

Step 5: Install Floor Joists

The floor joists are small beams that run across the main supports. You can place them perpendicular to the main beams by spacing them correctly (depending on the amount of weight the floor will hold). We suggest using strong joist hangers to attach them securely so the mezzanine doesn't sag or wobble later on.

Step 6: Lay The Flooring

Now, it is time to build the actual floor. You can secure plywood or OSB sheets to the joists using screws. Don't forget to leave some gaps for expansion and contraction. Make sure to reinforce the flooring if you want to store some heavy household items.

Step 7: Add Stairs, Ladders, And Railings

You can choose how to access this floor by adding one of the following –

• Stairs (best for frequent use)
• Ladders (space-saving, hard to climb)
• Spiral Staircases (stylish and compact)

Tip: You can also install a railing around the mezzanine edges to prevent accidental falls and use non-slip surfaces on stairs for safety.

Bonus: Finish And Customize It The Way You Want

Lastly, once you are done installing, you can add insulation, lighting, ventilation, storage solutions, etc., to make the space feel like your home. For example, you can choose a workspace setup with a desk, chair, or workbench along a cozy couch.  

Key Considerations Before Adding A Mezzanine Floor

Before you start building a mezzanine floor in your metal building, there are a few important things to think about. This is to ensure your space is safe, useful, and cost-effective. Let's see.

1. Local Building Codes And Permits

Once you know the primary purpose of your mezzanine, check local building codes for weight load limits, fire safety, exits, and railing heights. You can consult your local building authority before making final plans and buying materials.

2. Weight Load Capacity For Structural Safety

Your steel frames must be strong enough to support the mezzanine flooring and the load over it. Here are some examples to give you a basic idea –

• Light storage mezzanines (125 pounds per sq. ft.)
• Office or workspace mezzanines (150 pounds per sq. ft.)
• Heavy-duty mezzanines (250+ pounds per sq. ft.)

Tip: Hire a structural engineer to figure out the load-bearing capacity based on your usage. Do not skip this step.

3. Easy To Use And Access

How will you get up to the floor? Will you be using stairs, ladders, a hatch, or lift systems? Think about the vents and lighting on the mezzanine floor, as it can get hot and stuffy with items if not planned properly.

4. Cost Breakdown And What To Expect

It is important to break down costs depending on material and labor. Here is a rough idea of estimated costs for you –

• Basic (storage use) – $10 to $25 per sq. ft.
• Office/ workspace (home use) – $25 to $50 per sq. ft.
• Heavy-duty (industrial use) – $50+ per sq. ft.

You can choose budget-friendly materials like steel framing and plywood floors or opt for premium materials like high-quality wood, reinforced steel, custom stairs, and insulation. A well-built mezzanine structure will add to your property's value and boost the efficiency of your current space.

Get The Most Out Of Your Metal Building – Add A Mezzanine!

Adding a mezzanine flooring is one of the best ways to maximize space in your metal 2-car garage without taking up extra square footage of your property.  You can create room for storage, work, or a living space to relax and unwind. But, before you start, make sure to plan and consider building height, local building codes, and how you are going to use your mezzanine for the most part.

You can begin by measuring your space, choosing the right materials, and consulting a professional if necessary. With the right plan, your steel structure will soon have a brand new level of possibilities! What's your opinion on it? Share it with us!