The golden rule as far as slabbing or block paving goes is as follows; Foot traffic - 75mm/for vehicles 150mm whackered (compressed) hardcore or type1, base. Followed by a sharp sand/cement (stronger the better - at least 6:1) screed. Moisten the mix so that if you grip it in your hand it just about maintains the shape and holds together.Using poles laid at the required depth into the screed and distanced apart so that a straight bit of timber can be dragged along them thus levelling the area between. Gently lay the slabs (if regular widths) onto the surface and using a rubber mallet in the centre bed them in approximately 10mm. Place your timber across the entire course and strike with a mallet to ensure they are in line with each other. As you progress repeat this in all directions. This prevents water pooling in any unintentional dips and troughs. A 1:40 fall sloping away from the building or leading to a soak away is essential. Ensure the desired spacing between the slabs is maintained. Allow at least 24 hours for the screed to set (the longer the better!). Test one first before you go all Strictly on it!
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