Designing a foundation

You can choose to have your YZY Kit Home built on a concrete slab, paved base, timber or steel subfloor on stumps, or any other type of foundation. The base must be perfectly flat, solid, and level with all 90 degree angles.

Ideally, the base should be at least 100–400 mm above the existing ground level to prevent rain splash-up water damage to the walls. Also, vegetation should be kept away from the building walls to allow for good ventilation and quick drying after rain. Damp-proofing should be considered before installation. Read more about damp proofing and sealing the bottom boards to stop any moisture penetration in step 4 of the Builder’s Guide.

Important. Different requirements for a particular site will apply due to specific soil composition, so you should consult your local council, builder, or engineer before base preparation. You might need to have a geotechnical engineer test the soil on the site.

Consider water and sewer pipelines, which may be an obstacle for base preparation. You may also need to think of trees, overhanging branches, other vegetation, and the natural sunlight and/or nice view the building will receive.

It is crucial to make the base right, and if you’re not experienced enough, consult a licensed builder for advice.

5mm overhang of walls to form a drip edge

Raised subfloors made of timber or steel are the most common foundation that is used in building YZY Kit Homes.

Important. External walls must overhang the subfloor by 5mm. Overhang works as a drip edge, directing the water away from the bottom layer of walls and the foundation, as illustrated below. So, look at the external dimensions of the building perimeter and make your subfloor smaller in width and length by 10mm. For example, if your building envelope is 6,000mm x 8,000mm, make your foundation 5,990mm x 7,990mm.

Subfloor flooring wall boards section drawings
Subfloor flooring wall boards section drawings

All building steps can be found on Builders Guide page.