Parts of a Deck: Anatomy From Substructure to Surface
For construction, repair, or upkeep, it’s important to know about the different parts of a deck. A deck typically consists of the deck surface and the substructure. Many decks also include safety components such as railings and stairs, as well as functional accessories.
The substructure consists of the foundation, posts, joists, and deck beams. It is connected to the house via cross-beams. The concrete foundation, deck beams, and cross-beams make sure the building is stable and can hold weight. This article will provide you with an in-depth understanding of the complete composition of a deck.
Table of Contents
Deck Substructure
The deck substructure serves as the deck’s framework. The stability of the substructure directly determines the safety and service life of the entire deck. This part is usually made of pressure-treated wood or composite wood deck to keep it from getting damaged by water and bugs. It is primarily divided into the following parts:
Foundation
The foundation is the lowest component of the deck structure. Its function is to effectively distribute the deck’s load into the soil, preventing the deck from sinking, tilting, or shifting. The most common type of foundation is a concrete-poured pile foundation. To make sure the piles can hold enough weight, their diameter and spacing are based on the deck’s size, height, and local building rules.
Pile
Piles are the vertical columns that transfer the deck’s weight to the foundation. They serve as the bridge connecting the foundation to the upper framework. The base of the columns is firmly anchored to the foundation via column anchors, ensuring the columns do not shift under forces such as wind. The top of the columns supports the main beams.
Beams
Beams are horizontal structural members placed atop the columns. They directly bear the load from the joists and distribute it evenly to the columns below. Depending on the design, beams can be put under the joists to act as main supports, or they can be put next to the joists so that they are flush with the edge joists.
Rafter Boards
Rafter boards are a critical connecting element in the entire deck structure. It is a structural panel directly secured to the exterior wall of the house using high-strength bolts or anchor bolts. The purpose of this panel is to firmly connect the deck to the house, thereby transferring the deck’s weight to the house’s sturdy frame and foundation. If the deck-to-wall plate isn’t put on right, gets rotten, or has bolts that aren’t tight, the deck could come off the house, which could be very dangerous.
Waterproofing Strip
The waterproofing strip is a waterproof barrier installed between the deck plate and the exterior wall of the house. It is typically made of metal or vinyl and is L-shaped. Its purpose is to prevent rainwater from seeping in through the joint between the deck and the house. The waterproofing strip should be embedded beneath the wall’s waterproofing layer or overlapped with it. This ensures that water is completely directed away from the deck plate.
Deck Joists
The deck joists are the structural parts that hold up the decking boards. They run perpendicular to the cross beams and the outside walls of the house. The deck’s stability and load-bearing capabilities are based on the deck joists’ size, spacing, and span.
- Spacing: Typically, deck joists are spaced 16 inches on center. This is the most common and economical standard. If you prefer a sturdier feel underfoot, you can reduce the spacing to 12 inches.
- Connection: One end of the joist is secured to the joist plate using a joist hanger. The other end is secured to an edge joist or the main beam.
- Protection: Before putting down the decking, cover the tops of all the boards with waterproof tape. This will make them last longer. This tape nicely stops water from standing and getting into the wood, which is a good way to keep joists from rotting.
Bracing/Bridging
Small wooden blocks or metal pieces that are put between two frames are called bracing. Although they are small in size, they play a crucial role in the long-term stability of the deck structure.
Bracing effectively prevents joists from twisting or shifting laterally during use. At the same time, it distributes the load borne by a single joist to adjacent joists, enhancing the overall structural rigidity. Bracing is particularly essential along the deck’s perimeter and at stairwell openings.
Deck Surfaces and Safety Components
Surfaces and safety components are the most visible parts of the deck. They directly determine the deck’s functionality, aesthetics, and safety.
Deck Boards
Deck boards are the primary component of the deck surface and the part we come into direct contact with. Their material, color, texture, and installation method define the deck’s overall style. Common material options include:
- Traditional Wood: Such as teak, cedar, and pressure-treated pine, which offer a natural texture and relatively low cost. However, they require regular sanding, staining, or sealing; otherwise, they are prone to cracking, warping, and rot.
- Composite Decking: Composite decking has the good looks of wood and the long-lasting properties of plastic. It doesn’t fade, stain, or mold, and it doesn’t crack or bend, so it doesn’t need any annoying upkeep.
- PVC: It is made totally of plastic, and PVC decking is very good at keeping water, moisture, and pests out. Its surface is comfortable to the touch and is also maintenance-free.
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Railing Systems
For decks located at a certain height above ground, a railing system is not merely decorative—it is a mandatory requirement. A complete railing system consists of multiple components.
Railing Posts: Composite railing posts or 4×4-inch pressure-treated wood posts are what most railing systems are made of. They hold up the railing system vertically. They must be securely fastened to the deck’s framing or surface structure. For aesthetic purposes, post caps can be installed on top of the posts. Post caps not only enhance the appearance but also prevent moisture from seeping into the wood from the top.
Handrails: Horizontal components connecting the posts. The handrail is the part users come into contact with daily, so its comfort and stability are crucial. The lower rail is positioned close to the deck surface and, together with the upper rail, defines the enclosed space of the railing.
Balustrade Infill: The section between the top and bottom rails, serving as a barrier to prevent people or objects from falling.
Stairs
Stairs are structures connecting the deck to the ground. Their design must comply with ergonomic principles and building codes. They primarily include:
- Stair Stringers: The load-bearing framework of the stairs, used to support the treads and risers.
- Treads: The horizontal sections used for walking.
- Stringer: The vertical section between treads.
Local building rules must be followed to the letter when it comes to the staircase’s width, maximum rise, tread depth, and where the handrail goes.
Other Functional Accessories
Carefully designed accessories can add extra functionality and aesthetic value to a deck. They can transform a simple patio into a fully functional outdoor living space.
Under-Deck Drainage System
A waterproof membrane with a slope and drainage lines put in between the joists makes up an under-deck drainage system. It collects water seeping through the gaps in the decking and directs it away from the house via downspouts. This keeps the area beneath the deck dry. It can serve not only as dry storage space but can even be transformed into an outdoor living area.
Lighting Systems
Lighting is key to enhancing the nighttime experience and safety on the deck. Planning the lighting layout during the construction phase ensures seamless integration.
- Step Lights: Installed on the sides or risers of stair treads, these lights illuminate each step to prevent tripping.
- Recessed Lights: These lights can be put into the deck’s surface or between the fence posts. They can shine upwards or downwards to make a different mood.
- Lighted Railings: LED light strips built into handrails or balusters for a modern aesthetic.
Grilles and Skirting
Grilles or skirting are installed beneath the deck to conceal the exposed substructure. They give the deck a cleaner, more streamlined appearance. At the same time, they keep the air moving and keep from getting too wet.
Conclusion
Every component of a deck plays an irreplaceable role in the overall structure. By learning about these parts, you can help make sure that every part of your deck is safe and effective while it’s being built. If you’d like to learn more about decks, please feel free to contact us. EVODEK has a professional service team and offers high-quality composite decking materials.
FAQ
Does The Deck Need to be Painted or Sealed?
This depends entirely on the deck material you choose.
- Wooden Decks: Regular maintenance is required. Whether using pressure-treated wood or teak, you’ll need to apply paint, stain, or sealant to protect against UV rays and moisture.
- Composite Decks: No painting or sealing is required. These materials retain their natural color. The only maintenance needed is to clean the surface periodically with a soft brush and soapy water to keep it looking its best.
Does The Deck Substructure Need to be Inspected Regularly?
Yes. Although the substructure is hidden beneath the deck boards, it directly affects the safety of the entire deck. It is recommended to conduct a thorough inspection at least once a year, preferably in the spring or fall. During the check, if any wood rot or structural loosening is found, it should be fixed or strengthened right away.
Should I Choose a Wooden Deck or a Composite Deck?
It depends on your budget, lifestyle, and willingness to perform long-term maintenance. If you have a limited budget but are willing to invest time and effort into regular maintenance, a wooden deck is a viable option. In the long run, a composite deck is a better deal for money if you want something that doesn’t need much upkeep and lasts a long time.
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