Hi I'm after some advice. I've just had an extension built and the builders pre filled a patio area for future. 100mm type 1. I need to raise the patio a further 20mm to a start level to accommodate the 50mm sharp sand/cement and 20mm porcelain tiles to be the required 2 bricks below dpc. Should I add more type 1 or use crusher run? What's cheapest...compacted obviously with a whacker. Thanks in advance
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