Tag Archives: shed foundation

Shed Floor Design

There are many options when it comes to your shed floor design.  However, there are some basic steps you need to adhere to when building your shed floor.  Your shed floor design will depend on your shed foundation.  If you have a concrete foundation then that will be your floor.  However if you don’t have a concrete foundation then you need to frame the floor.  You will then need to decide your floor covering.

Shed Floor Design – Foundation

Concrete – If you have a concrete foundation then you need to make sure your design has the ability to anchor your walls to your foundation.  Your floor will basically be the concrete slab and then there are many finishing options to concrete.  You can have a smooth or rough finish.  You can also have a stamped pattern to the concrete and some shed plans have brick pavers that are designed into the floor.shed floor design concrete foundation

Wooden Pier – If you do not have a concrete foundation then most likely you have a gravel, concrete block or a wooden pier foundation.  If that is the case then your shed floor design will have you framing your floor on the foundation and then placing a floor covering on top of the frame.  Before you frame the floor and while you are in the foundation stage it is a good idea to have a vapor barrier.  The vapor barrier is a plastic covering over your foundation base that prevents moisture from getting to the shed floor and causing shed mold & mildew or wood rot.shed floor design concrete pier foundation

Shed Floor Design – Framing

If your foundation is not concrete then you will need to frame and build your floor.  Once you have your foundation level then you can start constructing your shed floor frame.  The most important part of this process is to make sure your foundation is level.  Once the foundation is level you will need to start the framing.

Squaring Joists – Make sure your joists are square at the ends so when you cut your joists to length then both ends will be square.

Crowning – The boards may have a bowing one way or the other and that is called the crown of the board.  You want the crown or bowed side up so the weight of the shed will push the crown down and level up the boards more over time.shed floor design board crowning

Framing – Depending on your shed plans this part can have different steps.  However, the first part of the process is to build the outer frame of the shed floor and square up the joists on each end.  Fasten them together with 16d galvanized nails.  Then place each floor joist at 16″ apart on center and attach them to the outer frame with the same type nails.  Before securing the wooden joists completely, make sure to take measurements on a diagonal from one corner to the other.  Make sure these measurements are not more than 1/8 of an inch off but as square as possible.  Then attach the joists securely.

Anchoring – You will then need to attach the floor to your foundation.  There are multiple ways of anchoring your floor to your foundation and that depends on your plans.  However if you have a concrete pier then you can use masonry bolts but you may also need to anchor with steel cable ground anchors.  If you have a wooden pier then you will need to anchor with wood bolts according to your shed plan.

Shed Floor Design – Covering

Once your floor is framed you will need to add floor covering.  This will typically be plywood or OSB (oriented strand board).  You will need to attach these boards where the wood fiber length is at a 90 degree angle from your floor joists to prevent sagging over time.  It is a good idea to get tongue and groove boards as they make a more secure fit.  Also, prior to nailing down the plywood or OSB it is a good idea to place wood glue on the joists to help secure the plywood or OSB even further to the joists.shed flooring design attaching plywood to joist

Shed Floor Design – Conclusion

Now that you have the basics to a shed floor design you can begin the building process.  Some basic pearls are to make sure you have a good set of plans and follow them accordingly.  When framing your shed floor make sure the foundation is level.  Make sure your outer framing is square and check diagonal measurements before securing all floor joists.  Place the floor joists with the crown up so they will level over time from the weight of the shed and attach to the squared frame at 16″ on center with galvanized nails.  Anchor your floor to your foundation according to your shed plans.  Your floor covering will either be plywood or OSB and should be at 90 degree angles to the joists.

I hope this helps,


Shed Foundation Construction

Anytime you are going to build a shed you have to think about the shed foundation construction.  All structures are built from the ground up and your shed is no different.  There are many options and they depend on where the shed will be located and what type of soil you have and your budget.  One thing you do not want to do is build it directly on the ground as the moisture may rot the wood and also the shed may lean from ground settling.

Shed Foundation Construction Types

Wood and Pier…

wood and pier shed foundation constructionThis shed foundation is good depending on the location and type of shed you build.  It is also considered to be a post and beam foundation because the wood is not just sitting on the ground but it is attached to posts that are secured in the ground.  The wood has to be pressure treated to withstand the moisture.  Furthermore, posts are to be secured properly at the right depth for the weight of your structure so you do not have a leaning shed.


gravel shed foundation constructionA shed foundation of gravel is good for a small to medium shed.  It is a sturdy foundation and can withstand heavy loads if you are putting equipment in your shed, but they are not the best for large sheds.  A large shed that holds equipment should be on a concrete slab.  Dig a hole the size of the shed and then put the gravel in the hole.  It will need to be leveled and tamped down to make a secure foundation.  The shed is then attached with pegs or auger anchors.

Cement Blocks…

cement block shed foundation constructionThese blocks make for an easy alternative for a shed foundation because they are readily available and can be delivered to your site.  They are spaced at 3-5 feet apart and the shed is built right on top of the blocks.  Level the blocks so you do not have a leaning shed and a  poor foundation.  Cement blocks are easy to move and if you have a small shed and want to move it at some point.  This might be a good alternative for future mobility of your shed.

Concrete Slab…

concrete slab shed foundation constructionThis is the strongest shed foundation construction and can withstand a full load contact.  It is a great foundation for sheds with machinery.  Therefore, if your shed is for equipment or a car then this is the one you want.  With the concrete slab, you do have to be careful if the slab is much larger than your shed.  If that is the case, then you run the risk of water resting on the slab and therefore rotting your shed.  So, you should try to get the slab and shed at the same dimensions.

Shed Foundation Construction Conclusion…

In conclusion, these are the basic common types of shed foundations for your structure.  As you prepare to build your structure you need to make sure you have a good set of plans.  The plans will make all the difference in building your structure on a firm foundation.

For what it’s worth,