How much sub base do i need

There are also Type 2 and scalping sub-bases, which are usually 40mm down to dust, but with a higher percentage of fines, therefore having less load-bearing capability. The thickness or depth of sub-base depends on the weight of traffic the paving is likely to incur. For sticky clay, it is advisable to go deeper, but for freer-draining, more stable sub-grades such as chalk or sandy soil, a general rule for a Type 1 sub-base could be as follows:. A vibrating plate compactor may be suitable for patios and paths, but a much heavier-duty vibrating roller will be required for a driveway.

With the growing desire for hard surfaces to be more porous, many designers, architects and contractors are looking at alternatives to solid mass concrete, but is a flexible, granular sub-base as good as a rigid one? In my opinion, it certainly has its place, particularly when a heavy load is required or where unstable ground may be a problem.

Paving an area of more than 6m x 6m will require expansion joints, and to comply with SuDS you will also need to ensure there is a suitable drainage system to manage surface water run off. Website Cookies. Cookie Preferences. Strictly necessary cookies Required Optional cookies We'd like to set Analytics cookies to help us improve our website by collecting and reporting information on how you use it.

Table of Contents. Converts square yards to square metres. Sub-base Coverage The area to be covered is T of DTp1. Appears on: Sub-bases. Grit Sand Volume The area to be covered is T of Grit Sand. Description: Calculates tonnage of grit sand required when compacted thickness and total area is known. Appears on: Laying Block Paving Screeding. Concrete Volume Enter dimensions of rectangle to be concreted: Length metres Width metres Thickness millimetres You will need approximately Description: Calculate required quantity of concrete.

Appears on: Concrete. Kg of cement Kg of sand Kg of gravel Litres of water. Description: Estimate volumes of aggregates and cement needed to mix a C7. Appears on: Laying Edgins. C20 Concrete The volume of concrete required is cubic metres You will need approximately Hello all, This is going to be my first time laying a patio!

What i need to know is whats the correct way to lay Sub base? Ask a tradesman. Thanks in advance. Like 3. Like 2. It can also be used as a filling product. Can you lay slabs on soil? Stick a bag of cement or 2 in with the sand and lay a dry mix. I'd just dig out to the depth of the slabs plus a bit and level it out, compact the soil, level with sand and lay the slabs over the top butted up really tight.

What is a Type 1 Sub Base? MOT type one is a crushed to provide a stable sub-base for road surfaces and pathways. Typical use is as a finished surface prior to a top coating of asphalt, concrete, shingle and block paving. Often used with a sand blinding. Both primary and recycled constituents can be used to produce a Type 1 sub-base.

Do I need a sub base for patio? Do I really need a Sub-base? The short answer is: if the pavement will be trafficked by vehicles, then yes, but if it will be foot-traffic only, then not necessarily. The type of paving or surfacing that will be used is one of the key factors in determining whether a sub-base will be required. What is Type 2 Sub Base? Type 2 crushed concrete is a standard sub-base material and used for roads such as pot-hole filling-in but like Type 1 it can be used for other things like driveways, backfill material, patios, tracks and other paths.