Building a Composite Deck with a Hot Tub
How hard is it to build a deck for a hot tub? The answer varies from person to person, but if you like to use your deck year-round, it’s definitely worth a try.
Adding a hot tub to your deck can make a big difference. However, you will need to plan this endeavor carefully. It’s important to ask yourself the following questions :
- Is my deck strong enough to support a hot tub?
- Should I build it myself or hire someone to do it?
- Where should I put the hot tub?
- What electrical changes need to be made?
Read on for all the answers about hot tub decks.
Table of Contents
Can You Install a Hot Tub on a Deck?
Yes, you can install a hot tub on a deck! Decks and hot tubs can work well together. It’s important to note that before you start planning a hot tub deck project, check out the structure of your deck or have it inspected by a professional. You need to make sure that your deck can support the weight of the hot tub.
Create a Plan for Your Hot Tub Deck
Since hot tubs are freestanding, they can be placed anywhere there is an adequate support structure. You can choose which place is best. You can also choose whether you want the hot tub to be on top of the deck, on the ground next to the deck, or built into the deck.
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Consider Hiring a Licensed Deck Contractor
If you don’t know much about structural engineering and electrical codes, you may need to hire a licensed deck contractor to do your job. Not only do they know how to safely incorporate a deck and hot tub, but they can also help you better conceptualize your hot tub deck.
Choosing a Hot Tub
You may find it difficult to choose a hot tub because there are so many to choose from. To get the hot tub you want, you should measure it. Pay particular attention to its size and weight when it is filled with water and people.
You can then figure out how much support the hot tub deck will need. An average 8 x 8 foot hot tub weighs about 5,000 pounds with people and water. A hot tub can be placed almost anywhere because it is freestanding. If you want maximum safety and insulation, choose an “all-foam” hot tub.
Determine How Much Structural Support Is Needed
To get your local building department to agree to your plans, you’ll need to show that the deck’s structure can hold up when the tub is filled with people and water.
This means specifying the size and depth of the concrete footings or floor slab. The size and spacing of the beams and joists, and how they will be attached, will also need to be specified. Design plans for hot tub decks may need to be reviewed by a professional engineer before they can be used.
Selecting Deck Materials
Choose the right deck material for your project, whether it’s a new deck or an old one that needs refinishing. Consider the following options when planning a hot tub deck project.
- Composite decking: Composite deck boards are strong, durable, and better at waterproofing. They also don’t need to be re-sanded and simply need to be cleaned with soap and water every once in a while to keep them looking good and in good working order.
- Pressure-treated wood: This decking material is used the most. This material is not expensive, but it needs to be refinished every two to three years. In addition, this type of wood can develop cracks and splinters.
- Cedar: This softwood is great for barefoot walking and is weather-resistant. Pressure-treated wood needs to be stained every so often to maintain the color you want. But cedar decks should last a little longer.
Where to Install a Hot Tub?
The height, size, and weight capacity of the deck will determine how and where the hot tub will be placed. Whether the hot tub is best placed on the ground, above ground, or buried in the deck will also depend on how the deck is installed.
Above Ground
If the hot tub is already installed on a concrete slab, you should probably leave it as is and build the deck over it. If the current deck is not strong enough to carry the hot tub. Then a deck that is flush with the ground may be more suitable for installing a hot tub. A deck that is flush with the ground is also a good idea for small or oddly shaped decks.
Above Ground Level
If the deck is sturdy enough to hold a hot tub, why not put it above the deck? You’ll save money compared to other installations, and it’s easy to get to. Just make sure the hot tub won’t impede traffic and that there is enough room for you to perform maintenance on the deck.
Built-in
A hot tub built into your deck is not only easy to get in and out of, but it also makes your deck look more expensive. In order to support the hot tub, you’ll need to pour a concrete floor or build a wood structure. This can make the construction cost higher than an in-ground or above-ground hot tub.
How Do I Build a Hot Tub Deck?
There are a few things to keep in mind when building a deck for your hot tub. You may want to consult with a building official before you begin. In addition, you may also want to consult with a professional who builds decks for hot tubs.
Step 1: Prepare the Site
Clear the area of sod and vegetation. The area where you want to place your in-ground or sunken tub needs to be dug, leveled, and compacted. In other places, slope the ground so that water does not pool under or around the deck.
To increase or improve the electricity supply to your hot tub, you should hire an electrician. You may need to consult an expert on how to make the hot tub deck stronger.
Step 2: Lay the Foundation
Use a diagonal bracing board to draw layout lines that are straight with the house. Then, use a tape measure, level, and plumb bob to find the footing locations. Mark the location of each footing with landscape nails and bright tape or spray paint. Use a trench digger or power drill to dig to the proper depth, then place the cardboard footing forms into the pit.
Level the foundation so that it is at a consistent height. Have someone look over the forms if needed. Then, place concrete into it, making sure the top is level. After the concrete has hardened, attach the brackets for the columns or beams to the foundation.
Step 3: Laying the Hot Tub Pad
A 3- to 4-inch thick concrete pad is required under both aboveground hot tubs and belowground hot tubs. Set and mark the corners of the pad in the same way you did the foundation. Add the total height of the hot tub, the height of the finished deck, and the height of the hot tub above the surface of the deck to get the height of the finished pad. Level and smooth the ground where the pad will be located with concrete blocks placed on top of the sand, or create a mold and fill it with concrete.
Step 4: Connect the Ledger Boards
Find the finished height of the deck from the house, remove the width of the deck, and draw a straight line. Secure the ledger boards in place along this line using ground screws or self-drilling structural screws. Do not place screws where the framing attaches.
Make sure the screws go deep enough into solid framing. Engineered beams and joists may need to be reinforced. Installing metal flashing over the soffit may mean removing a row of siding from the house on short notice.
Step 5: Install Support Columns
Find the difference in height between the top of the strut bracket and the top of the ledge board on each base, then subtract that number from the height of the beam. This is the length of the column. The nuances of the column length don’t matter. Just remember which post goes with which bracket. Put the posts in place and tighten the frame with screws.
Step 6: Installing the Crossbeams
Place the crossbeams in the crossbeam clips on the posts or on the foundation, making sure the crossbeams are aligned left and right. This may require help. If you want the crossbeams to be level, you must have them touching each post or bracket completely without wobbling.
Check that the crossbeams are level against the divider. Then use brackets to attach the crossbeams to the posts or to the crossbeam brackets at the footings.
Step 7: Installing the Deck Joists
Place the joist hangers along the lines you drew to show how the joists will attach to the siding and beams. Most wood decks have joists spaced 16 inches apart, while most composite decks have joists spaced 12 inches apart.
Where the deck needs to support a hot tub, the joists can be shorter or doubled. Install framing for a recessed hot tub so that the entrance hatch can accommodate a 30-inch wide opening. Use removable joists to make the access hatch strong enough to walk on. These joists are attached to the joist framing, but not nailed to it.
Step 8: Install Blocking
Placing blocks between the joists prevents the joists from rotating. Placing blocking on both sides serves two purposes: it makes the deck stronger and helps support the boards around the edges.
This is important for building decks or areas around the hot tub away from the walls. To make the two-point connection stronger, more blocking can be added where the railing struts are located. Stair struts may also need to be reinforced.
Step 9: Install Railing Posts
If the deck has a railing, install posts to support the railing. Secure each post to at least two structural members using ground screws or self-drilling construction screws. Secure the posts in place as you tighten them with a wrench. A cleat can also be screwed to the side of the post in order to maintain the proper height.
Step 10: Install Deck Boards
To prevent the joists and beams from rotting, they can be covered with butyl tape. Stagger the planks from left to right, making sure each end of the plank touches the joists. The ends of the planks should be long enough to hang over the edge.
With the planks all in place, draw a line with chalk and cut the planks to length. Keep the spacing between the planks the same. To minimize the need for pre-drilling, use polymer-coated self-drilling, self-sinking deck screws. Hidden fasteners are also a good option.
Step 11: Stairs or Box Steps
Box steps consist of several layers of small steps stacked on top of each other. They can be used as either chairs or tables and are a good choice for hot tub decks. If there is not a lot of space, a winch step may be better.
Building codes require that steps be no more than 7-3/4 inches high and no less than 4 inches high. They must also be even: the height difference between the tallest and shortest steps can’t be more than 1/4 inch. Use brackets to secure the steps or stairs to the deck’s framing.
Summary
Building a hot tub deck can be a daunting task, but don’t let that stop you. It’s easy to have fun as long as you plan ahead and keep the basic essentials in mind. Your biggest choice is whether to do it yourself or hire a construction worker. Once you know this, you can start making plans for your hot tub deck so you can enjoy it all year long.
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