When it comes to ordering bar chairs to prop your sheets of mesh up from the ground, remember approximately 18 bar chairs are required for every sheet of 6m x 2.4m mesh. As a rule of thumb when ordering steel remember to divide the square meterage of your site by 12.2 to ascertain how many sheets of mesh you require. Allow for variations and variables in your slab, for not enough steel and accessories can cost another delivery, delays and additional concrete charges. Wow! This is probably THE MOST IMPORTANT thing to consider when organising your concrete pour. HAVE I ORDERED ENOUGH STEEL, ACCESSORIES AND CONCRETE? Make sure the steel and accessories arrive BEFORE the concreter’s arrive, otherwise delays could cost you both additional concreter charges and aggravation.Ħ. Whether it is you or the concreter supplying it, it is prudent to have someone on site when the steel and accessories are delivered, to ensure everything is there. WHO IS SUPPLYING THE STEEL REINFORCING ACCESSORIES (I.E. MESH AND BAR CHAIRS)? THE CONCRETER OR ME? HOW ARE THEY BEING DELIVERED? Otherwise form work could be a large expense for you to outlay for a one off concrete job.ĥ. If the answer to these questions is NO, you may need to consider hiring a concreter or someone who can supply the form work for you. BOARDS?) IF YOU ARE DOING THE CONCRETING YOURSELF, DO YOU HAVE FORMWORK? BOARDS? PEGS? DOES THE CONCRETER I AM HIRING DO THE HAVE TO DO THE JOB HAVE FORMWORK? (I.E. Many concreters find 10mm or smaller stones are easier to place, though in many instances they come at an additional cost.Ĥ. The number after your MPA relates to the size of the aggregate within the concrete mix i.e., 20 for 20 millimetre stone or 10 for 10 millimetre stone. 32mpa and 40mpa concrete is suitable for shed slabs and heavy traffic areas. As a rule of thumb 20mph concrete is fine for foot traffic, I.e., footpaths and house slabs, depending on your sub base, whilst 25 mph is more appropriate for driveways and light traffic. 20mpa is weaker than 25mpa concrete, 32mpa and 40mpa concrete and so on. In layman terms that’s how much stress or pressure it can take before cracks, shears or breaks. The MPA of concrete is a term used to describe the megapascal strength of concrete, or its tensile strength. WHAT STRENGTH CONCRETE DO I REQUIRE? WHAT'S THIS 20MPA, 25MPA MEAN? OR 20/20? 25/10? As a rule of thumb SL62 sheets of mesh are suitable for foot traffic i.e., pathways and patio’s, sheets of SL72 72 are appropriate for light traffic i.e., driveways and garages, whilst sheets of SL82 and SL92 are utilised when heavy traffic and transport is traversing over your concrete slab i.e., in shed slabs or high traffic areas.ģ. This is a good question, and may well depend on the geotechnical composition of your soil. WHAT SIZE STEEL REINFORCING DO I REQUIRE? In summer it is still prudent to “hose it down” and wet the crusher dust prior to your concrete pour, otherwise when your concrete is poured it is going to dry, shrink and crack.Ģ. It is easy to level and protects your slab from the cracks and imperfections below. Crusher dust, manufactured sand or barmac, as it is sometimes referred, makes an ideal sub base. Hot dry weather may cause your sub base to crack, leading ultimately to cracks within your concrete slab. Like many sub bases a clay based ground surface expands and contracts with the weather. Your sub base needs to be level and free from cracks or imperfections before you commence your concrete slab. WHAT'S MY SUB BASE LIKE? GROUND SURFACE? DO I NEED CRUSHER DUST OR SOME FILL?
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