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Shed Glossary

Confused by some of the industry jargon? If you have been shopping around for a new shed, you have likely come across a few terms you don’t know. 

To help you understand the in’s and out’s of a shed, we have put together a comprehensive shed glossary that lists a bunch of shed building terminology and definitions. If you still have questions, feel free to give us a call on 1800 350 450 to speak to a shed expert.

A.

A.S.I. SHED GROUP

Australian Steel Institute (ASI) Shed Group promotes the construction of cold-formed shed structures and promotes steel shed industry compliance. TechSpan Sheds are built from structural steel, a much stronger alternative the cold formed sheds.

ACCREDITED

If something is accredited it means that it is given authority and meets recognized standards overseen by an official body

APEX

The peak of the roof line. An apex is the name given to the joint that connects the two rafters at the highest point of a gable shed roofline

B.

BARGE CAPPING/FLASHING

Barge Cappings are typically right angled flashings installed at each end of your shed. The capping seals the gap between the top of the wall sheeting and the side edge of the roof cladding.

BASE PLATES

The plate on the base of a Column the attaches the shed to the concrete footings.

BAY

The space between the Portals frames is known as ‘1 Bay’. This is different to the Span with is the measurement between the columns parallel with the rafter

BCA

Building Codes Of Australia

BMT

Base Metal Thickness. – The thickness of the metal. This does not include coatings and paint.

BOM

Bill Of Materials. This is a list of raw material, parts, items, assemblies and other components that make up your shed.

C.

C-SECTION

This is a type of steel purlin that is shaped like the letter C.

CAPPING

Capping is an alternate mane for a flashing. It is used to cover and seal gaps between your roof cladding. Two types of capping include Barge Capping and Ridge Capping.

CLADDING

This is the external metal sheeting, it comes in two different profiles, Corrugated (Custom Orb) and Trimdeck.

This can be supplied in a Colourbond or Zinc Finish.

CLASS 1A BUILDING (BCA)

This classification refers to buildings that will be used as livable dwellings Some sheds have this classification such as hangar homes.

CLASS 10A BUILDING (BCA)

This classification refers to non-habitable buildings. It is common for buildings such as industrial sheds, hangars, horse arenas and farm sheds.

CLEATS

These are steel plates used to connected sections of the shed together with bolts or tek screws. 

COLORBOND

This is a brand of pre-coated coloured cladding by BlueScope Steel.

COLUMN

Columns are the upright structural members of a shed

CORNER FLASHINGS

Angled steel cappings installed vertically in a corner situation to cover any gaps between cladding to make the building watertight.

CROSS BRACING

This is the diagonal bracing member which keeps the shed straight and square when it is under load.

CUSTOM-ORB

This is the name given to a corrugated roof sheeting and wall cladding by BlueScope Steel.

CYCLONIC RATED BUILDINGS

These are the buildings that are engineered to a higher structural strength as they are located within a Cyclonic (Region C) area.

D.

DIAPHRAGM BRACING

Refers to the bracing effect that roof and wall cladding have on a building.

DOOR JAMB

A doorjamb, door jamb (also known as a doorpost) is the vertical portion of the door frame that a door is secured on.

DOWNPIPES

These are the pipes that carry storm-water from the gutter to the ground or a tank. They are commonly made from PVC.

E.

EAVE

This is the over hang of the shed roof.

END WALL

The End wall the wall located at the Gable end of a shed.

ENGINEERING CERTIFICATION

When purchasing a steel building you will be issued with a engineers certificate. Each design certification is generated specifically for your structure, base on site conditions and shed usage. An engineering certificate will be needed when submitting a building application to your local council.

This is a step during your buildings construction where an independent engineer will evaluate your design and the future site of the shed. During this stage, the engineer will give further feedback and recommendations for your shed. We explain this in detail in our Shed Construction Process guide.

F.

FLY BRACE

This is the bracing which supports the truss square to the purlins.

FOOTINGS

The Footings of a shed are also known as Piers. These are typically bored holes in the ground. Steel Hold down Bolts are cast into these piers for the Columns to be fixed to.

FRAME

This is the main ‘skeleton’ of your shed that the cladding, doors, windows, and other components are attached to.

G.

GABLE OR GABLE END

A Gable is the most common roof line for sheds. It is a triangular designed with two sloping roof sides that meet in the middle. A gable wall is an end wall that is peaked.

GARAGE

This is a small shed normally enclose which is used to store cars and other household goods.

GIRDER TRUSS

A Girder truss (or Header beam) refers to the beam running across the opening of an open bay, roller door. This provides additional horizontal support above the door and is often used to attached sheeting.

GIRT

These are the roll formed structural members that run the length of the shed walls to support the wall cladding.

GIRT BRACKET

This is a cleat that attaches wall girls to columns and roller door jambs.

G P BRACKET

A general-purpose bracket for attaching headers, girls, mullions and other shed components.

GUTTERS

A Gutter is a small steel channel which runs the entire length of the eve of the roof, it is used to collect and carry away rainwater.

GUTTER BRACKET

A gutter bracket is a small bracket use to support the gutter of the shed.

H.

HAUCH

This is the connection between the Column and the truss.

HEIGHT

This is the distance between the ground and the underside of the eave

HOLD DOWN CAGES/BRACKETS

Hold Down Cages/ Brackets are the pre-fabricated Bolt combination which is pre-cast into the piers on which the columns are fixed. Normally around 1 meter in length depending on the size of the shed.

I.

IMPORTANCE LEVEL (IL)

The importance level is determined how you plan to use your shed, its location, and the overall risk it poses to human life and other structure if it were to be damaged.

Farm sheds are normally importance level 1 and industrial buildings are typically rated at 2 or more

INSULATION

Insulation refers to the different materials that are used to insulate a building.

K.

KNEE BRACKET, CLEAT OR BRACE

This is a strengthening member between the truss/rafter and the column. (Commonly found on purlin sheds)

L.

LENGTH

This is the distance from the front of the building to the back along the eve side. For example, if you had a shed with 3 four-metre bays, you would have a shed with a length of 12 metres.

M.

MEZZANINE FLOOR

This is a raised floor inside the shed structure.

MULLION

This is a vertical column in the end walls use to support the end wall cladding. It is also the name of the columns used to support the sides of roller doors.

MULTI-SPAN

Multi-Span is when you have one or more columns to support the roof rafters mid-span to allow you to get a larger area under your roof.

O.

OPEN FRONT / OPEN BAYS

An open front/ open bay shed has aside, or part of a side open, with no wall cladding to hinder access.

P.

PA DOOR

Personal Access Door is a small door just for personnel access. These are normally required for industrial buildings to use as Fire exits.

PORTAL FRAME

This is normally made up of 2 Columns and two or more trusses

PURLIN

These are the roll-formed lengths of material that run perpendicular to the trusses to support the roof cladding.

R.

RAFTER

Rafters is an alternate name to a roof truss.  They are normally made from Universal Beam (UB)

RIDGE CAPPING

This is the folded flashings that seal the gap between the roof cladding where it meets at the top of the building to protect your building from the weather and stop water leakage.

ROOF PITCH

The pitch of the roof refers to its angle in comparison to the ground. We commonly use 5 or 7.5 deg.

ROOF VENTILATION

A roof ventilator is installed close to the apex of your roof to draw air from the building and assist with ventilation. They ensure there is proper air circulation in your building, reducing air moisture and mould in winter and heat build-up in summer. More information on roof ventilation types can be found here

ROOF SAFETY WIRE

This is the safety mesh which is fixed to the roof prior to insulation and cladding. It is used to protect the installers during installation and maintenance.

S.

SKILLION ROOF

This is a shed the has no Gable, one high side and one low side.

SKYLIGHT

A translucent sheeting that can replace roof cladding to allow light into your building.

SLAB

The concrete floor of a shed

SPAN

The width of the shed and/or the distance between the columns.

T.

TCT

Total Coating Thickness. This is a term used to describe the overall thickness of a coated or coloured sheet steel. This is essentially the total thickness of the Base Metal Thickness plus any paint or coating.

TEK SCREW

Tek Screws are the screw used to fix the cladding to the shed.

TERRAIN

This refers to the characteristics and surroundings of your shed’s location.

TERRAIN CATEGORY 1

Refers to sheds that are erected in very open and exposed terrain.

TERRAIN CATEGORY 1.5

This refers to buildings located on or near coastal short areas and enclosed bays that extend more than 10km.

TERRAIN CATEGORY 2

This refers to buildings that are usually located in areas with open terrain and few obstructions between 1.5 metres and 5 metres. This is often the case with cleared farmland.

TERRAIN CATEGORY 2.5

This refers to buildings located in semi-rural and urban areas with obstructions of similar height.

TERRAIN CATEGORY 3

This mostly refers to buildings located in built-up suburban areas. This terrain type has a number of obstructions of similar height, including other buildings and dense tall tree bushland.

TOPOGRAPHIC FACTOR

This refers to the topography of your shed’s location. This includes the altitude, slope and direction of your shed’s location.

TOPSPAN OR TOP HAT

The Top Hat is a lightweight purlin sometimes used on light duty sheds or small spans.

TRIMDEK

This is a common profile of Cladding. with 5 distinct ribs and wide, flat pans between the ribs.

TRUSS

Trusses steel members are used to support the roof of your shed. They fabricated from galvanised square tube to form a web truss that’s bolted at the apex and the haunch

V.

VERMASEAL/VERMIN SEAL

This is installed between a concrete floor and wall cladding to prevent vermin, lizards, snakes etc. from entering the building. It can also prevent corrosion of your wall cladding which can be caused by direct contact with the concrete slab.

W.

WIND SPEED

The wind speed directly relates to what region you are located in.

WIND SPEED REGION

Australia has been divided into wind speed regions depending on the likely wind speeds expected in that area. They are Region A, Region B, Region C and Region D. See the map below outlining wind speed regions and region details under the latest 2021 standards.

WIND SPEED REGION A

Wind Region A is the Ultimate Design Wind speed of 41m/s or 147.6km/h. This wind speed region covers most of Australia.

WIND SPEED REGION B

Wind Region B is the Ultimate Design Wind speed of 51.9m/s or 186.84km/h. This sub cyclonic wind speed region covers 100km’s inland from the coast of QLD, NT, and most of WA. 

WIND SPEED REGION C

Wind Region C is the Ultimate Design Wind speed of 64.5m/s or 232.2km/h. This cyclonic wind speed region covers the 50km’s inland from the coast of Northern QLD, NT, and northern WA.

WIND SPEED REGION D

Wind Region D is the Ultimate Design Wind speed of 88m/s or 316.8km/h. This severe cyclonic wind speed region covers the 50km’s inland from the central coast of WA.

Still Have Questions?

Our expert team can help you with any shed questions you might have and ensure you get a shed design that is structured to work.

We’ll support you from planning to completion to ensure the process is as smooth as possible and the end result is high quality.

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