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Deck blocking refers to the addition of solid blocks between deck joists to create a solid structure that meets building code requirements. It is an essential aspect of decking construction that ensures structural integrity, resistance to joist rotation, and limited resistance to diagonal bracing. Deck blocking is crucial for creating a safe and reliable outdoor living space.

Joist blocking is typically made of the same dimension material as the joists and is placed between parallel joists, adjacent joists, and band joists. Cross bracing deck joists with cross joist braces can also increase the structural resistance to twisting and bending. The correct height for deck blocking is essential for a proper fit and secure surfaces for bolts or screws. Joist blocking requirements for a single deck usually involve extra blocking and additional joist braces to support the deck’s perimeter and connected joists.

Colors to choose from

Deck joist spacing and the gap between joists must also meet building code requirements. Joist bridging, joist caps, and joist tape can help ensure a secure connection between the joist and the decking material, while joist hangers provide a nailing surface for the joist. Direct nailing is another efficient method of attaching joists, but it must be done at regular intervals, usually every 6 feet, to ensure proper support.

Deck blocking is also crucial in preventing moisture damage by providing a moisture barrier between the decking material and the ground. Deck screws or regular deck screws are used for installation, depending on code compliance requirements and the type of joist material. When installing blocks during installation, alternate block placement is necessary to avoid issues with nail movement and floor structures.

A range of grab rails and Handicap Grab Bars is also essential for ensuring the safety of those using the outdoor living space. Grab Bar in Stainless Steel is a durable option that can withstand weather elements and resist corrosion. Picture frames and board runs can provide additional support for the deck board designs, and decking boards can be sized from scrap boards to ensure proper fit and distance between joists. A solid deck block foundation can provide ample hammer swing space and additional fastening material for efficient installation methods. Overall, deck blocking is an essential technique for creating a safe and secure outdoor living space that will last for years to come.

Materials needed:

  • 2 x 10 or 2 x 8 Pressure Treated Wood
  • 4″ Wood screws

1. Measure the dimensions of the deck with a tape measure. Next, find the post locations. Start by marking where the corner and end posts will be on the deck. For the middle posts, determine if the side length is longer than the maximum span for your type of railing (6ft for picket railing, 5ft for glass railing). Add middle posts such that the sections will be equal, but will not exceed the maximum recommended railing length.

Example: (Picket Railing, Maximum Length = 6ft) 

5ft Side – No middle post required, 7ft Side – 1 middle post required.

Blocking 2 1 768x657 1

2. Next, cut sections of 2 x 8 to fit between the joists of the deck. Place them parallel (flat against) the rim joist and screw them in from the sides using wood screws.

Blocking detail revised



3. Once blocking is installed, deck boards can then be installed, so that the railing posts can be installed on top of the decking.

Cross Section blocking

Welcome to Toronto Deck and Rail’s blocking page! We are your go-to source for high-quality blocking products and services in Toronto and the surrounding areas. Whether you’re a homeowner, contractor, or builder, we have the expertise and resources to help you complete your project successfully.

At Toronto Deck and Rail, we understand the importance of proper blocking installation for the structural integrity and safety of your project. That’s why we offer a wide selection of blocking products, including wood blocking, metal blocking, and composite blocking. We also provide professional blocking installation services to ensure your project meets all necessary codes and regulations.

Our wood blocking products are made from high-quality, pressure-treated lumber to resist decay and termite damage. We offer various sizes and lengths to suit your specific project needs. Our metal blocking products are designed to provide maximum strength and durability, and are available in different gauges and finishes. Our composite blocking products are made from recycled materials and are environmentally friendly while offering excellent resistance to moisture, rot, and insects.

If you’re unsure about which blocking product is best for your project, our knowledgeable and experienced team can help. We’ll work closely with you to understand your project requirements and recommend the best products and services to suit your needs and budget.

At Toronto Deck and Rail, we are committed to providing our customers with the highest level of service and quality. We pride ourselves on our attention to detail, timely delivery, and competitive pricing. Contact us today to learn more about our blocking products and services and how we can help you complete your project with confidence.

What Homeowners Need to Know About Deck Joist Spacing and Blocking deck

Deck joist spacing and blocking are important considerations for any homeowner building a deck. Proper spacing and blocking are essential for ensuring a sturdy, long-lasting deck that is safe for use. Here are some important things homeowners should know about deck joist spacing and blocking.

First, it’s important to understand the role of the deck frame. The frame consists of the floor joists and the perimeter rim joists that form the outer edges of the deck. When installing composite decking, it’s important to pay attention to the manufacturer’s specifications for joist spans and joist dimension material.

Sister joists are often used to add additional support to the joist structure, which is especially important when joist spans exceed recommended lengths. Cross bracing joists can also be used to help reduce bounce and twisting in the deck frame.

Hidden fasteners, such as structural screws, can be used to fasten decking boards to the joist framework. It’s important to make sure the screws are installed at the correct height and in the right places to ensure maximum holding power.

Joist blocking is another key element in deck framing. Blocking between joists can help add stability and prevent twisting and warping of the joists. The advantage of joist blocking is that it allows for greater resistance to joist rotation and can help prevent the joists from becoming twisted.

Correct joist size and spacing is important, and homeowners should pay attention to perimeter joists, mid-beam joists, and mid-span joists. It’s also important to have a rigid rim joist and to install 8-foot-long joists at 16-inch intervals.

Joist caps, such as joist cap systems, can be used to protect the joist edge from signs of corrosion. Joist scraps can also be used for blocking between joists, and homeowners can even use pieces of wood cut from larger dimension joists.

Post stability and attachment are also important considerations. Post supports can be used to secure the posts to the deck frame, and decking fasteners, framing fasteners, and post supports can be used to secure the entire structure.

By paying attention to these important details, homeowners can ensure effective fastening and create a sturdy, safe, and long-lasting outdoor living space.