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What are Joist Hangers

July 3rd, 2013

It may be a simple question but you would be surprised at the number of people of don't use them for smaller jobs. Joist Hangers, as the name suggests are designed to hold timber joists in place. They are used to anchor things like decking, floors and ceilings. Most joist hangers wrap around three sides of a wooden beam and nails or screws are put into the holes to keep it in place. There is a connecting plate on the joist hanger that is fastened to the surrounding frame. Joist hangers are versatile and are much stronger than using nails or screws alone. They are also easier to fit and relatively cheap given the length of time they will last. Provided all the holes have nails or screws inserted, they provide excellent stability. Joist hangers can also be welded if needed and can be attached to masonry as well as timber. If you install them properly, joist hangers will keep your decks and floors strong as wood dries, twists, shrinks and ages.

They come in many shapes and sizes to fit different beams and framing configurations. Some units have a heavy-duty design to support larger loads or heavier beams. Most joist hangers are U-shaped, which allows them to fit around three sides of a joist. Others may have a T-shaped plate to provide a more secure connection to the wall framing. Some have sloped plates or connecting arms, and others are designed to accommodate double beams in a single hanger. Most manufacturers recommend using the largest size hanger that will fit your joists. Hangers should not be adapted, cut or modified, and should never be reused. All pre-cut or pre-drilled nails holes in each hanger must have the correct nails or screws inserted to maintain the integrity of the joist. When choosing hangers for outdoor applications, such as decking, look for galvanized units to withstand rust and corrosion over time. You should also use the correct galvanised nails or galvanised screws for outdoors or proper decking screws.

The joist hanger range at Tradefix, includes everything from mini hangers to long leg jiffy joist hangers, so we have plenty of options for you. So what are the key differences between the products?

Mini hangers

Mini hangers from tradefixdirect.com are designed to support short span joists, as well as trap hatches and in-fill timbers. Our particular hangers come in 38mm and 50mm, and could be considered as both economical and ideal for light duty applications.

Standard leg jiffy joist hangers

When it comes to our jiffy joists in standard length sizes, we have plenty. From 38mm all the way to 150mm, you'll find our joists in either 0.9 pre galvanised mild steel or 1.2 pre galvanised mild steel. Because you can adjust the leg length, these joists can accommodate various standard timber sections. Another key point is that these joists are made of light gauge material, which eliminates the need for notching.

Long leg jiffy joist hangers

For deeper timber to timber applications, our long leg hangers are a suitable choice. Ideal applications include use in loft conversions, supporting deeper floor joists, purlin connections and dropped or underslung floor support. All of our long leg jiffy hangers are quick and easy to use, and come in a range of sizes.

Extended leg jiffy joist hangers

Whilst our long leg hangers are 450mm, our extended leg jiffy joist hangers are 600mm, meaning they are a quick and simple solution for deeper timber to timber applications. Again, this might involve use in loft conversions and supporting deeper floor joists. As such, these particular hangers are popular with building contractors.

Timber to masonry joist hangers


For supporting timber joists and structural composite timber from masonry walls, our timber to masonry joist hangers are ideal. In order to comply with fire regulations in party wall applications, straddle these hangers. They are robotically welded to avoid defects and avoid edge corrosion through BS6178 galvanised standard.

Multi truss hangers

If you need to support multiple trusses from primary girder, purlin to beam connections and main trimmer joists, look at our multi trust hanger. It is used for joining timber to timber, masonry or concrete, and available at all standard timber widths. Ideal for a higher overall load performance.

The main issue is that joist hangers are well worth using for even the smallest jobs given their cost effectiveness.