Technical Tips & Information

Technical Tips & Information


Matching Colours:

Product colours shown on this site have been reproduced to represent actual product colours as accurately as possible. However this representation may be subject to the limitations of web palette colours and your screen settings. These may affect colour tones. Please also note that if you are printing colour pallets, the printed matter may not be accurate using most household printers and should not be used for colour matching purposes. It is recommended that if you are attempting to accurately match to a existing colour, that you consult an actual colour sample which may be available from a product stockist or where applicable - Bluescope®

Choosing The Appropriate Size:

In many cases, your first assumption relating to the size of shed you require, is seldom correct.  It is very easy to under or over estimate the size required.  From a purely storage point of view, it is usually better to go bigger than smaller. Of course this is not your only consideration.
Access, changes to the visual aspect of your backyard, local authority size & positioning requirements etc., all play their relative part in the decision making process.

One of the most sensible approaches in determining the size required, is to lay out the items you would like to store, in the back yard (allowing for sufficient space around each item to accommodate ease of access and ability to place and replace the item on many occasions).  Now that you have placed them in a area (as you think you would store them), this area will represent the base footprint of the shed.  You are now able to take a measurement of length and width.  It is prudent to be generous in your allowances for items as,  merely stacking these items tightly may cause difficulty in accessing & replacing them, in a confined shed space.

The other considerations regarding size are the minimum wall height, door opening, and where the shed door(s) are hinged, what clearance needs to be allowed for to swing the door(s) open (if you are subject to limited space).

Choosing The Appropriate Site To Position Your Shed:

With todays small house blocks, the number of options as to where a shed can be positioned are usually limited.  That aspect aside, the site you choose should be one that is flat, level & one that (if possible) is clear of any natural water-flow pathway through your property.  Other considerations are -

Site Preparation For Shed Assembly:

What Does The Shed Have To Sit On?

The key to a successful installation and hassell-free shed life, is to ensure that the shed is placed & secured to a flat, level & square surface.  This will ensure that it will support the shed against stress caused by ground movement or settlement, deter rot, & subsequently increase the proper operation & lifespan of the shed.

Types Of Bases A Shed Can Be Secured To?

Concrete Slab ►

It is recommended that the minimum slab size be at least 100mm larger in each direction, than the external base dimension of the shed.  For example- a shed that has a base dimension of 3m x 3m, should have a minimum slab size of 3.1m x 3.1m.

Slab must be square, flat & level. Reinforcement mesh should be used. Slab depth is usually 100mm.


Some of the tools & items that may be required, are - Tape measure, hammer, shovel, wheelbarrow, long spirit level, bolt cutters, saw, string line, concrete float & edger, mixer, timber for boxing.

Identify a good, level, firm, and compacted area to position your slab.  Make sure it is clear of debris and obstruction.  The slab should be 100mm deep & the overall size should allow additional room to provide enough space to prepare & place the box frame (which keeps the concrete mix in place, allowing it to set).  Builders plastic sheeting & bedding sand may be used and placed in the area the slab is to be positioned, although these are optional. Builders plastic aids in minimising moisture transfer up into the slab from the ground beneath, & bedding sand assists in levelling out the ground profile.

Assemble the box frame securely to the correct size required & fix it to timber pegs hammered into the ground (pegs to be located on the outside of the box frame). Ensure the ground is reasonably level underneath the frame to minimise the gaps which could allow the concrete mix to seep & escape.  The top & sides of the frame should square & level in all directions (particularly the diagonals).  To ensure this, use the tape measure to check measurements & a spirit level & long straight edge for levels.

Next, add reinforcement mesh which should be cut to size with bolt cutters, approx. 50-80mm shorter than the over measurement of the slab.  This is to ensure the ends of the mesh are adequately encased in concrete & protected from rusting (commonly known as concrete cancer).

Now pour the concrete mix into the framed area.  Using the shovel, ensure the mixture is worked in well, often cutting down into the concrete to help it work itself into the boxed area well & eliminate hollow spots.  Special attention should be paid to ensure all edges are worked in & well filled.  As the concrete is poured, lift the reinforcement mesh so that it sits approximately at mid depth or at the middle of the slab thickness.

Once the concrete is poured, screed the top to level it off with the boxing framework. Screeding is moving a straight board (or similar) in a sawing & taping motion, across the top of the frame & moving towards a common direction, to level the concrete.  The slab should then be finished with a concrete float.  The surface could then be left as is, or completed with a broom finish.  Once the concrete begins to firm, the edges can be finished off with a edging tool.

The frame-work boxing can be removed the next day.  It is recommended that you allow the slab a minimum of 72 hours curing time before you proceed to complete your project and fix the shed to it.

Concrete Paving Blocks ►

Concrete paving blocks only, should be considered.  Clay paving blocks or bricks are not typically suitable as they have a tendency to crack & break (thereby weakening the fixing point), once drilled & stressed with a dynabolt or similar.

Once you select the paving blocks you wish to use (there are varying sizes), calculate how many you require to make up your base.  Note, the prepared base must be at least 100mm longer in each direction, than the base size of the shed.  It is preferable to go larger, if you need to, than smaller.

For a paved base, the area should be stripped of vegetation & dug down below ground level to allow for the prerequisite base filling. Consideration should also be given to laying down a weed suppressant mat.

The area should then be filled with approximately 100mm of decomposed granite, crusher dust, bedding sand or similar.  This needs to be well compacted & leveled to provide a sound & level base.  The edges or coping needs to be secured to ensure that future water flows do not erode away & undermine the bedding base. Some form of framework or mortar, can be used.

Place & bed down the paving blocks firmly. You are now ready to fit your assembled shed.

In high wind areas, it is recommended that your shed be appropriately secured to a full concrete slab, rather than paving blocks or other.

Timber Decks / Floors ►

When purchasing or constructing a timber floor, to secure your shed to, ensure the appropriate type and grade of timber is used.  It should be treated to provide rot and termite resistance, thus enhancing a lifespan that is typically at least 10 years.  A popular choice is ACQ (Ammonium Copper Quaternary) treatment of the timber is a non-arsenic based treatment ideal for in-ground contact or above ground exposures.

Timber floors are are moveable, can usually be used without substantial ground preparation & earthworks, & are relatively easy to construct.

Ok. I’ve Decided To Lay A Concrete Slab. What Are My Options?

· Purchase cement & gravel, to hand or machine mix the concrete

· Purchase pre-blended bags of cement & sand/gravel, to hand or machine mix the concrete

· Purchase a redi-mix concrete delivery from a local provider

In considering your options, give sufficient contemplation to the time & effort required to undertake the task, as well as the materials & tools that would be required to complete. Of course the cost of each option is also important in the final analysis.

To begin, you must first calculate the volume of concrete (finished product) is required. This is done by identifying the overall size of the slab x the proposed depth. For example – a 3x3m shed will require a minimum slab size of 3.1x3.1m x 0.1 (or 100mm) depth. Here the volume required would be 0.96 cubic meters (or close enough to 1m3).

An allowance of between 3-5% should also be added for concrete wasteage.

Next, do your homework to find out what it would cost you to purchase the required materials. All other things being equal, the volume of concrete required will factor the relative cost effectiveness or each alternative.

With redi-mix deliveries, there are minimum quantities you can purchase, as well as pre-determined increments. Check with your local supplier.

With pre-blended bags of cement & sand/gravel, a guide is 110  20 bags are required to produce 1 cubic meter. This proves to be a costly option.

With regard to cement & gravel to hand mix or use a concrete mixer, check with you local suppliers who can assist you with quantities required & costs.

Steps To Assemble An Absco Garden Shed


Absco Snaptite System Illustrated



Some Of The Tools That May Be Required For Shed Assembly:


 Pre-Assembly - What To Do First In Undertaking Your Shed Assembly Project:


One of the most important elements in correctly assembling your shed, is to correctly align all the parts before fixing-off.

Almost exclusively, manufacturers pre-drill the wall & roof sheeting, as well as the supporting framework.  When assembled correctly, all the holes are meant to line up.

If during assembly, you are having difficulty lining up the holes to receive the screws or other fixings, a few things may have occurred to arrive at this point. Firstly, the incorrect part has been used. Secondly, the correct part has been used but it has been fitted incorrectly. Or, thirdly, the assembled structure is out of square. The latter is the most common cause in these circumstances.

When assembling the shed, you must ensure that structure is square, to avoid potential alignment issues.

Need Any Additional Questions Answered, or just want some general advice?

Call our Shedxperts (for the cost of a local call) on 1300 834 738 or email us on

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