For bedding under the slabs use 5 parts sharp sand, 1 part soft sand and 1 cement. One part cement, two and a half sand and three and a half coarse aggregate. This page contains a price guide for a new patio. Below is an example of a sand to cement mix ratio recommendation from a cement manufacturer. There’s no reason to mix joint sand with cement when filling paver cracks, as the sand does a perfectly fine job on its own. If using combined aggregate, this mix would be 1:5. There's more to laying paving than simply the ratio and type of mortar mix. Concrete - 1 part cement, 2 parts concreting sand and 3 parts 20 millimeter aggregate. So on that basis i'd say you need between 25 and 50 bags depending on depth of sand for 9 square metres. We used to point as we laid, by using the bedding mix as the joint material the fill and strike as the day wore on. Mortar - 1 part cement, 4 to 5 parts building sand. For foundations, a mix of 1 part cement to 3 parts sand to 6 parts aggregates can be used. No real need for cement. Ask 5 different paviours and you'll get 5 different methods, some use a little sharp sand to strengthen the mortar and some prefer soft only, depending of course on the type of slabs, substrate / ground and how it's been prepared. And for the pointing, I was going to leave a 5mm gap between the slabs and then let them set for 24 hrs, and then do another mix of dry mortar, with ratio of 3:1 sand/cement, is this ok. homeimprovements 179 posts Large format is not the same I am planning to measure the area, and use string and pegs to map out the area, and will be putting down 40mm of sub base (gravel and stones), Sharp sand is good enough to bed them in. Mortar additives are particularly effective in giving both engineered and natural pavers the best possible chance of being installed neatly and adhering to a concrete foundation over the long term. I extended our patio with slabs and used somewhere between 1 and 2 bags of sharp sand per 2ft square slab. Ideal for wall foundations or bases and laying paving slabs, etc. Masonry Cement Mix: Building brick or stone structures requires the commercial-grade strength of masonry cement mix. This mixture features gravel and sand mixed with water to create a strong bond. Paving Concrete – 1:1 ½:2 ½ mix. More water, cement or sand can be added if the mixture is too wet or dry. For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used. Mortar Cement Mix: Mortar is a common cement mix used to lay brick and stone. We have in the past fattened it up with the odd shovel of soft building sand but this can lead to colour problems when gauging future mixes. Using a standard mortar mix consisting only of sand and cement is not sufficient for engineered stone applications. Render Mortar Mix (Modern Buildings) For pointing use 4 parts soft sand and 1 part cement. 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