We have created this Foundation Help & Advice centre to answer your questions about GreenRaft and its insulated foundation solutions. We are also providing information on various foundation types to explain the reason why a particular foundation might be used or has been selected by your structural engineer.

This image shows one foundation solution. There are countless options to support your structure and our foundation help and advice centre is there to explain the many options

It is not an exhaustive list, so if you have a question that needs an answer, please let us know. Hopefully, we will add your question to the section.

There will be some linking between the topics where subjects overlap, This should give a better understanding of the various foundations and how they are used.

It is a huge topic, so you will also find links to other authoritative sites where more in-depth articles are available.

The main factors that influence what type of foundation might be used are the load of the structure, the bearing capacity of the soil, the width of the foundation upon that soil and other site conditions. These site conditions may be soil and strata mixtures, water tables, nearby trees or removed trees.

Help Centre Main Topics

Across the top are five topics related to foundations, that make up this Foundation Help & Advice Centre. The topics cover foundation types, foundation design, thermal performance, costings, and installation.

Pick which one seems most appropriate for your question and see if the answer is in there.

Types Of Foundation

Pad Foundations are localised footings that usually take the direct load from a column or any other direct point loading. They are normally associated with larger span building such as warehouses where the structural load is carried through columns.

A pad is normally between 600mm and 2 metres deep. They need stable ground with good bearing capacity. Any deeper than this and a piled solution is usually more cost effective.

The size of the pad will be calculated by the project’s structural engineer and will be dependent upon the ground conditions and the amount of the load. The pad will have reinforcement within to resist the “punching shear” force of the column load.

Though a pad footing would normally take a column load they are often used to take the load of a spanning ground beam. Pad foundations are mostly formed in a square shape but can be circular or rectangular too.

If a pad foundation is supporting a concrete frame structure then the column and the beam will be cast as one piece. If supporting a steel frame or timber structure then the pad and columns will need a suitable fastening mechanism.

Sometimes, a point load within a building can be incorporated into a raft foundation.