How to Build a Ramp for Your Shed in 5 Steps. Mower ramp for shed
How to Build a Ramp for Your Shed in 5 Steps
Ah yes, a shed ramp! Making the most out of available space in our yards is a constant struggle. We want more room for tools, for sports equipment, for that extra car but there’s only so much room. Shed ramps provide a savvy solution by allowing the most efficient use of space. everything that doesn’t fit inside the shed can be stashed away up high on the ramp. Not only does it help with storage, but it looks way cool, too! If you’ve been wanting to add this handy outdoor accessory to your yard, this blog post is for you. In today’s post, we’ll cover all the steps on how to build a DIY shed ramp in five simple steps. Whether you have a metal shed or a vinyl shed, we are here to help. So rev up those power tools and let’s get started!
Building a ramp for your shed requires careful planning and measurements. Step-by-step instructions can be found online that will guide you through constructing your own shed ramp.
Let’s Build a Ramp l 4K Ultra HD
Designing the Ramp
Designing the Ramp can be a daunting task for many DIY enthusiasts, but with patience and thoughtful consideration it can be done in five steps. Depending on the size of your shed and your needs, you will need to decide how steep the ramp should be. Generally, ramps should have an incline of one and a half inches for every foot. However, if you need to transport multiple items up and down it could necessitate a steeper angle. Additionally, wood boards should be used that are wide enough for two-wheeled carts or wheelbarrows to pass through safely. Alternately, strong galvanized steel sheets can be used for a more industrial look and better durability. For added security and stability consider securing support posts into the ground as necessary.
No matter which material you choose or angle of inclination you decide on, it’s essential to make sure you know what’s needed ahead of time to ensure the project is completed efficiently. With this knowledge, you are now ready to move onto the next step: gathering the right supplies and materials needed to build your DIY Shed Ramp.
Most Important Points to Remember
Building a shed ramp is a five step process that requires careful planning. Depending on the size of the shed and its intended purpose, the angle may need to be adjusted. Common materials used for building a ramp include wood boards or galvanized steel sheets. Consider adding support posts for added security and stability. Researching ahead of time is essential for the project’s success. Gather all necessary supplies and materials before moving forward with construction. Also, you may view our other detailed guides that include ‘How to build a shed’ and ‘How to insulate a shed.’
Supplies and Materials Needed
When constructing a shed ramp, the first step is to assemble the necessary supplies and materials. These supplies should include wood planks, screws,shovel, saw, level and hammer. Wood planks will be used as the base of the ramp and should be cut to size in accordance to the size of the shed entrance. Depending on the weight capacity of the shed, ⅝” thick pressure-treated plywood or positioned interlocking deck boards can be used for strength and stability. Other materials may also be needed such as nails and a power drill.
In order to keep your ramp looking neat and structured, consider using galvanized hardware like heavy duty screws in place of nails when secure fastening wood planks together. Although they are more expensive than nails, they are rust-resistant, have greater holding power and provide a longer lasting support system.
Ultimately, it is up to you to make an educated decision as to what specific supplies and materials you would like to use for your DIY ramp build. For those on a strict budget, there are definitely less expensive options available. However, with any construction project, it is important to factor in cost-efficiency versus quality in terms of longevity in order to choose the material that best fits your individual needs.
Once all of your supplies have been gathered, you are ready to move onto constructing your ramp’s grade and slope distance.
Ramp Grade and Slope
When planning to build a ramp for your shed, one of the most important factors to consider is the grade and slope. This factor will determine how steep or gradual the incline of your ramp is and is potentially the difference between a functional ramp that is easily accessed and a ramp that is unnavigable.
There are two ways to ensure the angle of the ramp is conducive to its purpose: measuring the angle with a protractor or using an incline ratio. The easiest way to measure and set the angle is using the ratio 1:12. meaning if your shed requires 12 inches of total rise, then it should have a length of at least 12 feet (144 inches). Ultimately, you’ll want to create a slight incline easy enough for vehicles and heavier equipment to access without excessively taxing your participants. Alternatively, you may also opt for a gentler grade when assembling a professional ramp with precautions such as handrails, accessible railings, and slip-proof surfaces necessary for wheelchair access.
No matter what type of ramp grade you decide on for your shed, proper safety should always be taken into consideration when building a DIY structure such as this. There are advantages and disadvantages to either approach depending on individual needs, but having the right formula in place can make all the difference in creating an enjoyable user experience.
Now that we’ve discussed strategies for establishing proper grade and steepness for your shed ramp let’s move onto constructing the base platform in order to begin assembling our ramp from the ground up.
Constructing the Base Platform
Construction of the base platform for a DIY shed ramp is an important step in creating a straight, level and durable surface. Building a sturdy and reliable platform is necessary to ensure both long-term stability and proper usage of the ramp. This can be achieved by selecting the right materials, factors such as slope and load capacity must be taken into account.
When it comes to material selection, owners should opt for treated lumber or steel beams when constructing the base platform, depending on the desired strength and durability. Treated lumber is more commonly used as it’s easier to work with and cost effective; however, steel beams provide significantly higher strength and weight capacity that makes it a better option for larger ramps. In either case, double-checking lumbar strengths and weight capacities will determine which type of material will be best suited for the job.
The slope of the ramp must also be considered during construction of the base platform, as even small differences in height can lead to major functionality issues. Gradually increasing the height of each section can help create an easy transition while keeping weight distribution even throughout. For example, a 3:12 ratio (or 3″ in every 12″) makes a gradual incline that can easily accommodate most standard applications.
Leading into the next section about foundation and support requires another important factor: weight capacity. Determining the weight capacity depends largely on both the material selected as well as how it’s constructed. A reinforced platform that uses multiple layers of 2×6 joists staggered at 16” intervals can increase load bearing capabilities compared to single layer plywood construction.
Now that we have detailed professionals options for constructing a solid base platform for your DIY shed ramp, let’s move on to learn about foundations and supports. essential components for ensuring stability and safety.
- What materials and steps are needed to build a ramp for a shed?
- Write 3 scientific statistics about “How To Build A Ramp For A Shed?”
- The length of the shed ramp should be at least 4 times the rise, or height of the shed.
- The surface of the shed ramp should have an incline no greater than 1:12 (1 inch of rise per 12 inches of run).
- The tread or width of the shed ramp should be at least 36 inches wide.
Foundation and Support
The foundation and support of a DIY ramp for a shed is essential for its long-term use. There are two primary considerations when constructing the foundation: the leveling and quality of the ground surfaces, and the materials used to support the ramp structure.
When it comes to levelling and surface quality, most choose to use either a gravel or concrete base. Gravel gives a softer contact point between the ground and the ramp while offering ventilation below. Concrete provides more rigid footing but is also less forgiving if furniture or equipment is dropped on it. It is important to note that regardless of which base you choose, proper drainage should be considered in order to prevent pooling water underneath.
With regard to support materials, wood is usually the preferred choice because of its affordability and ease of workability. When choosing lumber for your shed ramp, look for weather-resistant woods that are treated for outdoor use such as cedar or western redwood. Pressure-treated pine is also an option, however it may require frequent stainings or sealants due to its vulnerability to decay and warping over time.
Once you have settled on the foundation and materials you will be using, you can begin assembling them into a frame that will hold up your shed ramp structure. This involves attaching several posts to firmly anchor down each corner of the frame along with additional beams and joists in areas where additional strength is needed such as around doors and at midpoints of each side, including corners. With all pieces securely connected, your foundation and support system will be ready for the next step – building the ramp itself.
Building the Ramp
The ramp is an essential part of any DIY shed project as it will provide easy access to the shed for loading and unloading materials. Building the ramp for your shed may seem like a daunting task, but with some basic knowledge and tools, you can easily build a safe and sturdy ramp that will serve its purpose for many years to come.
Before beginning, there are several important considerations to keep in mind when building a ramp. The first is the slope of the ramp – it should be no steeper than 4:12, or 4 inches of vertical rise per 12 inches of horizontal run. This slope will ensure that it is not too steep while remaining functional. Next, consider the size and weight capacity of the ramp, as this will determine the type of materials you use. Finally, pay close attention to the details in order to make sure that everything is properly secured and up to code.
The first step in building the ramp is gathering all of the necessary materials, such as pressure-treated lumber, deck screws, nuts and bolts, and any additional components such as handrails or guardrails if desired. Once these materials have been collected, they can be sorted according to their size and shape depending on what type of ramp design is desired.
Next, mark off where you’d like to build your ramp with stakes and string or chalk lines for accuracy before beginning construction. It’s wise to use outdoor-rated adhesive or sealant to help prevent water damage on joints and connections. Secure each board by drilling holes along its sides and securing them together with nuts and bolts. Many builders also opt for galvanized hardware such as lag screws or bolts for extra protection from corrosion due to moisture or weather exposure. Finally, attach stringers (vertical boards used to support the platform) along both sides of the ramp in order to keep it secure while in use.
At this point, your structure’s frame should be complete; however, if any additional features were planned such as handrails or guard rails, these should now be securely attached using appropriate hardware before moving on to decking and joists. With careful planning and attention to detail your new shed ramp should meet safety standards while providing easy access for years to come!
Decking and joists are key components when it comes to ensuring a sturdy base for your DIY shed rampthe next section will discuss how best to specify these materials for a successful project outcome.
Decking and Joists
Decking and joists are essential components in building a successful shed ramp. Installing decking boards requires precise measurements and fastened securely with screws. It is important to use composite or pressure treated lumber for joists and decking, as this type of lumber is impervious to rot and pests.
When building the frame, you will need to lay out two step stringers at the entrance of the ramp. These should be attached securely in position with a minimum of two galvanized lag bolts per stringer. Make sure that you install support blocking underneath each stringer, equidistant between each other, no more than 16″ apart. Attach the blocking to the floor trusses using two nails or one screw at each end.
Once the frame and stringers are properly secured, decking can now be installed. When laying out your boards, it is important to space them evenly between 1/4”. 3/8” apart. This allows for any expansion or contraction due to weather related climate changes. Also, make sure to pre-drill holes in the joists prior to driving screws into the boards. Failing to do this can result in splitting or cracking in the boards over time.
Debating the pros and cons of using composite or pressure treated lumber for joists and decking can be discussed from both perspectives depending on what works best for your requirements. Composite vs treated lumber may depend on budget and environment you are working in; however, using a pressure treated wood when building your shed ramp will ensure longevity and durability against harsh weather elements.
Now that you have created a sturdy frame by attaching the step stringers and installed your decking boards, you are ready to begin securing your ramp. The next section will discuss how to properly secure your ramp to ensure safety when entering and exiting your shed.
Securing the Ramp
When building a ramp, it is necessary to use specialized hardware to ensure the platform is stable and has support where it’s needed. Depending on the materials and terrain of your shed, there are multiple ways to secure the ramp. Having a solid base foundation is important since this will form the basis for creating a safe and efficient ramp.
The most reliable way to secure a shed ramp is by using lag screws and metal framing. Lag screws can be placed directly into edges of the platform while metal framing can provide additional support if necessary. Angle brackets are also an effective way to fix the framework in place. It’s important that whichever installation method you use, make sure it’s sturdy enough and that it covers all four sides safely. For ground level, pressure-treated wood can also be used as a floating anchor system for added support and stability.
Debate: There are others who may argue that lag screws alone can securely fasten down a ramp, but investing in additional materials such as metal framing or angle brackets provide extra reinforcement and strength should any part of the framework become loose over time. This will serve as an investment in your project since the more effort and dedication you put into securing your ramp, the less likely you will have to deal with undesirable results in the future due to lack of support or maintenance.
No matter which method you choose, make sure that you place considerable effort into reinforcing your shed ramp structure so it can serve its purpose without putting costly repairs or replacing wooden components down the line. With all these tips addressed, it’s time to move onto leveling and landings.
Leveling and Landings
When building a ramp for your shed it’s important to ensure that the platform and surface is level, or as close to it as possible. This will not only provide for a smoother ride up, but also reduce stress on the ramps and make them last much longer with less maintenance required. Before beginning the construction of your DIY shed ramp there are two key elements that need to be considered: leveling the ground and ensuring there are landings where necessary.
Leveling plays an important role when constructing any outdoor structure, including a shed ramp. Without leveling, the entire ramp surface is placed at risk of being unusable due to sagging and instability. To get your DIY shed ramp firmly rooted in its foundation, it’s important to fill any holes or depressions in the area around the shed and lightly grade the surface so that water runoff proceeds away from the shed. Additionally, use scrap lumber or string lines to assure that your DIY shed ramp is level all three ways: lengthwise, widthwise, and between levels.
Landings are also an essential consideration when constructing your DIY shed ramp. Properly installed landings can help provide stability while preventing any sags or dips which otherwise might form in sections of the ramp over time. Any landing should extend from one end of the ramp to the other and contain ample supports underneath it so that it remains secure during use. When installing landings on a multi-level DIY shed ramp, pay particular attention to how far apart each level is placed and if necessary add additional supports along the upper level for greater safety and longevity.
Now that you understand proper leveling and installation of landings within a DIY shed ramp, let’s go over the final steps and considerations required for successful completion of your project in the next section.
Final Steps and Considerations
For the final steps of building a DIY shed ramp, there are several things to consider. It is important to think carefully before proceeding to ensure that the ramp is safe, secure, and capable of holding the weight of the intended items.
First, check the slope of the ramp. The slope should not exceed 1:20 (1 unit vertically for every 20 units horizontally). If it does exceed this ratio, consider reinforcing the ramp with additional material or decreasing the length of the ramp. Also make sure that the area on either side of the shed is flat and level. any dips or bumps can lead to an unstable ramp which could risk serious injury.
Second, determine how you will secure or anchor the ramp to prevent it from shifting around. Depending on your local codes and required regulations, you may want to consider concrete footings or steel anchors, though wooden screws are a more affordable option also.
Third, finish off the ramp by adding surface materials such as wood decking or porous surfaces like gravel and soil. This will provide a stable footing and also prevent slipping and sliding when items are being moved along its path. Make sure that whatever material is chosen has a slip-resistant rating of at least ‘R13’.
Finally, decide on an access gate if necessary. In some cases – especially if heavy objects are being moved up and down frequently – a four-sided gate might be appropriate. This should be swinging inwards towards the shed and have a lockable latch as a safety measure to help avoid any accidents from happening.
In conclusion, consider all factors before beginning your DIY shed ramp project – from size to features to stability. so that you end up with a safe and solid structure capable of carrying whatever load you intend it for without any risk for yourself or those around you.
Answers to Common Questions with Detailed Explanations
What materials do I need to build a shed ramp?
In order to build a shed ramp, you will need several materials. To start with, you will need pressure-treated lumber boards, nails, and screws for assembling the frame. You will also need plywood for creating a deck for your ramp and galvanized steel for reinforcing the joint area of the frame. Finally, you may also want to include anti-slip mats or strips depending on the surface texture you want for your ramp. These materials should be carefully chosen based on the desired weight capacity of your ramp and its intended use.
How long should a shed ramp be?
The length of a shed ramp should depend on the size and height of your shed, as well as its overall purpose. Generally, a shed ramp should be approximately 1 foot long for every 4 to 5 inches (10-12 cm) of height that the shed has. This means that an 8-foot (2.4 m) high shed will require a ramp at least 8 feet (2.4 m) in length. It’s best to make the ramp slightly longer than this so it can accommodate any potential changes in the grade. an extra couple of feet of space is recommended. Additionally, if you plan to use the ramp to access larger tools or items like riding lawnmowers, you may want to make your ramp even longer so it can accommodate them comfortably.
What are the steps I need to take to build a shed ramp?
The steps to build a shed ramp can vary depending on the size and weight of the shed, and the area where the ramp is being built. However, generally speaking, these are the five steps you will need to take in order to build a successful shed ramp:
Establish a plan for your ramp. This will include measuring your shed, assessing what type of materials you’ll need, drawing up plans for the project and calculating the necessary angles for the ramp.
Gather the necessary materials based on your plan such as lumber, deck boards or plywood, and brackets to secure it all together.
Start building! First, create a level foundation for your ramp by laying down landscape timbers or interlocking bricks along both sides of the shed opening. Measure out how far away these should be so that your ramp won’t drag on the ground behind it–about an inch. Then begin attaching pieces of wood together using wood screws or nails until you reach a steeper angle (about 25°), being sure to secure each piece with brackets and lag bolts.
Once you’ve assembled your ramp structure, secure it to ground underneath using lag screws and washers according to your plan.
Finally, finish it off with outdoor paint or sealant to protect it against external elements such as rain or sun exposure.
Following these steps will ensure that your shed ramp is strong, sturdy and safe for use–now get outside and get building!
How to Build a Shed Ramp? | Easy Steps With Pictures
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Your shed is ready for use, and you decide to start storing stuff in it. You get your mower to the shed and then realize that you missed creating a ramp to roll the mower up. Or you may have someone at home who uses a wheelchair, and you overlooked their ease of access to the shed.
Whether you wish to use the shed for storage, as a kid’s playhouse, or a workshop, giving it rolling access is inevitable. And this is served by a shed ramp.
Now that you agree to the benefits of including a ramp in the shed design, buying a readymade ramp is an option. However, building one is not that difficult either. It would be best to create a flat plane supported at a low angle traveling from the ground to the shed door. With some essential equipment and a little carpentry skill, building a shed ramp is safe and easy and takes just a few hours.
Let us take you through the step-by-step instructions on how to build a shed ramp. We have attached pictures at each step, so you get the construction right the first time.
Understand The Science
The ramp is a piece of plywood laid between the gap between the ground and the door. The built should be stable, and thus knowing the physics is essential.
The ramp should be firmly attached below the door frame and should securely rest on the ground on the other end. Once the ramp is stabilized, it is crucial to line the supporting joists and lay the ramp board.
It is recommended to use pressure-treated lumber to support weight, which makes the ramp easily accessible and safe to use.
Materials and Tools
Steps To Build a Shed Ramp
We will be attaching the ledger board in the first step. You will notice a lip under the shed door. The ledger board should mount flush with the shed face. You will need a 2×4″ here.
Anchor the 2×6″ ledger board under the shed door using washers and lag screws. The ledger board must be level. Mark the ramp stringer location beforehand so that the lag screws do not get in the way. Predrill the holes, ensuring that the screws are staggered.There should be some room left on the lower edge to fix one more support board.
You will need to determine a slope angle that is comfortable for the ramp. Use a 2×4″ to get the estimate. Mark the area to be sufficiently big to fit in the concrete blocks. Check the diagonal distance to ensure it is a perfect square. Once done, dig a hole to place the concrete block. A 4″ hole should be sufficient.
It is time to set the concrete blocks. You will need a paver base to help you place as well as level every block. Make sure that everything that you set is tight and perfectly straight.
Screw a 2×4″ on the bottom part of the ledger board. This is the support board for your ramp. We will be placing the stringers on the board to give your ramp extra support. Rip the 2×4″ to the perfect size else the bottom would overhang giving an unprofessional look to your ramp.
Measure the distance between the concrete block and the ledger board. It is recommended that you take this measurement at least twice to get it right. Then, use this measurement to cut the stringer.Determine the angle between the ledger board and the stringer. For this, set the stringer towards the corner of your support board. Next, get a speed square and mark the plumb line.
Set the stringer on the support board. Use a scrap piece and scribe a line to mark the angle between the block and the stringer.
Secure the stringers into the ledger board with the help of screws.
Now that the stringers are set create a block between the stringers. Cut the blocking and screw it between the stringers to form the spacing.
The stringers should be anchored perfectly, so it does not move. Use a powder actuate nailer and drive in a few nails to fasten the block into the concrete. This step is essential, so there are no movements on the sides.
We will now be cutting the ramp boards to length. Once done, predrill the holes and screw the boards to the stringers. The last panel at the bottom should extend a few inches beyond the stringer.
It is an optional step but highly recommended. You can paint the ramp to match the color of your shed. It adds to the aesthetic beauty and also works as a protective layer for your ramp.
You have constructed a sturdy ramp that can easily handle the weight of a heavy load. And it looks professional too.
So save yourself from physical harm while lifting things into and from your shed. All that you need is an afternoon and this plan to DIY a ramp for your shed.
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Shed Entrance Ramps and Their Benefits
For a great number of homeowners considering installing or upgrading a shed on their property, a shed ramp will be a major consideration. One of the simplest modifications available for a shed, a basic entrance ramp helps with several areas of storage and convenience for many shed types.
At A-Shed USA, we’re proud to offer not only a wide variety of storage sheds, garages and other custom sheds, but also expertise in additional products like shed entrance ramps. In today’s blog, let’s take a look at some of the primary benefits associated with storage shed entrance ramps, plus why you might consider including one in your shed purchase and setup.
Accessibility and Convenience
For starters, shed ramps are fantastic products for convenience and access to the shed. While some use sheds primarily for storage, others use bungalows or double-wide sheds as refurbished guest homes – a ramp here makes entry and exit safe for any guests, including elderly relatives who might visit.
Even for those who only use the shed for storage and gardening needs, a ramp can be hugely beneficial. Those who have knee or other physical issues often appreciate the ability to walk right into the shed rather than stepping up a level.
For those who utilize the shed as a storage area for any kind of wheeled vehicle, whether we’re talking about a car, motorcycle, bicycle or even yard items like a lawn mower or snowblower, a ramp is often a must-have. This makes moving such vehicles in and out of the area far easier, and also prevents the potential for damage. Those who utilize items like ridden lawn mowers can ride them straight in and out of the shed during use, making for the most convenient process possible.
Shed ramps, just like sheds themselves, are available in numerous different materials and styles. This means you can customize them to match the aesthetic of the rest of the shed easily, or you can look for an even sturdier material if you know heavy items will be going up and down the ramp regularly. Wood, aluminum and high-strength steel ramps are all available.
In cases where you don’t care much about the aesthetic, on the other hand, this material selection allows you a wide array of choices for practical purposes. Aluminum ramps, for instance, are known to be lightweight and easy to move around, so they’re perfect for cases where you don’t want a permanent installation and may be moving the ramp around.
For more on potentially including a ramp in your shed purchase and installation, or to learn about any of our storage sheds or other custom shed products, speak to the staff at A-Shed USA today.
Shed Ramp Ideas: and How To Build a Shed Ramp
Most sheds raise at least few inches above the outdoor grade level. This is especially true for sheds with wooden floor and wooden foundation. This is where shed ramps come in place. You probably have no problems to step inside the shed anyway. But moving heavy outdoor equipment like lawn mowers, bicycles etc, in and out quickly becomes pain without a ramp. Another reason to install a ramp comes the ground around the shed slopes.
Requirements for your shed ramp
Shed ramps are simple constructions. They only need to satisfy some basic requirements:
- To be robust enough to sustain the weight of the equipment you will move in the shed and out of it.
- Not to slip. This is very important. A slippery ramp may cause you fall down with a lawn mover and get severely injured. There are several ways to prevent slippery surface depending on the ramp type (read about them below).
- Not too steep. The most common ratio of outdoor shed ramps is 1 inch rise per 8″ length (source. If your ramp is too steep it will make it hard to wheel heaving tools in the shed.
You have the choice to build your shed ramps yourself or simply to buy ready one and place it there. This also depends on the shed ramp type. Let’s explore the most common ones:
Shed Ramp Types
If you are lazy like me you might want to just place a couple of planks to use for a shed ramp. I wouldn’t really call this ramp although it does the work sometimes. The planks must be very robust. And it’s not easy to drive in a lawn mower on such so called ramp. This works as a quick fix only. For something more sustainable consider a wooden, metal or concrete shed ramp.
Metal Shed Ramp
They are made of steel or aluminum. The most robust shed ramps are made of steel and can sustain very heavy load. Due to the curved ends these ramps can be shorter and steeper and save space. Aluminum ramps are lighter but not as robust as steel ones. Both types have holes in them to give grip and avoid slip.
Typically you would buy these shed ramps from the store unless you are experienced in working with metals. They can be quite expensive though, sometimes exceeding 1/3 of the entire shed price.
Concrete Shed Ramp
Their main advantage is long life and durability. If you don’t plan to move your shed ever you can consider building such one. The main problem with concrete ramps is once it’s there you can’t move it. And breaking concrete isn’t easy thing to do either.
Building such a ramp is also not a simple thing. You need a well constructed timber mold to pour concrete in it and then to flatten it following the slope. At the bottom ground it’s recommended to place compacted stone.
Wooden Shed Ramp
They are everyone’s favorite. Cheap and easy to make, easy to detach and move, and easy to fit any ground surface. Of course this convenience has its price. Wooden shed ramps sustain less weight and quickly rot especially if not treated. Their surface becomes slippery when wet so you’ll need to figure out some real rubber covering to avoid this.
If you are a DIY shed builder wooden ramp is the choice for sure.
How To Build a Shed Ramp
Don’t rush it. First go to the drawing board or load the drawing program on your computer. Figure out the shape and the steepness according to the ground slope, the space you have and how high is your shed off the ground.
The top of the shed ramp should be made of hard-pressed planks or exterior grade plywood. Place 5-6 triangular supports from pressure treated timber under the top surface. Cross braces may be added to ensure the supports stability.
To avoid the ramp getting slippery in wet conditions you need some covering. The best covering is of real rubber. Don’t neglect this.
Finally if the ground under the ramp is soft, you’ll need some flooring made of gravel and/or concrete like shown here.
Building a Ramp for Shed
Here is an excellent diagram showing you how to add a ramp to your shed in great detail.