Levelling out concrete floor

make sure you brake all lumps up and sweep the floor so no dirt a qoute of pva glue and buy flexi leveling compound its better

Hi, Sub floor preparation is key to getting a good finish for your chosen floor, regardless of type and as such I would, in truth, recommend getting a professional to screed the floor. Theres quite an 'art' to it even with self levelling products, especially over large areas. However if your reasonably skilled at DIY, and confident to have a go your self, I would suggest a good quality water based (NOT latex) self levelling screed such as F Ball Stop Gap 300 HD rather than any of the products available from the DIY superstores, and a 'boat nosed' flooring trowel. You will need to make sure the subfloor is reasonably free of dust and debris and any loose material is removed. Any deep cracks or holes will need to be filled/packed with a suitable repair compound prior to screeding. Most screeds will 'self level' in thickness's of upto 3mm, so if you need to bring the floor level up higher than this then it will need to be done on stages. Each bag will cover approx 6 square metres, and you will need to mix sufficient product to cover the entire area prior to pouring, as the product will 'go off' quite quickly once on the floor and you'll end up with ridges if the product isn't applied to the whole area seamlessly. Once poured dont 'overwork' the screed with the trowel, the idea is to 'encourage' the screed to flow across the floor and end up at a uniform thickness. Hope this helps, and good luck!