The questing is often asked do you have to build on a slab or do you have to use footings?

This question is often asked because some people want to have a wooden floor rather than a slab. Maybe the building site is a steep one or they might want to build the base up to a level using Thermacell blocks and then fill up the site with suitable filling or to construct a wooden floor, or perhaps build a garage underneath the main portion of the house.

All these application are possible.

If it is desired to build a garage underneath the house, the 250mm block is recommended as its strength enables it to double as a retaining wall and structural wall.
The 166mm block can then be used to construct the external walls on the next two storeys. The interior walls can be built with the 125mm blocks if there is a slab under them, or else; a timber frame can be used.
Timber frames are slightly cheaper than 125mm walls, but the Thermacell walls are worth the extra cost as they considerably strengthen the outside walls and improve the sound deadening and acoustics and give better control over heating and cooling throughout the house