Guide 82

Concrete slab foundation 3 × 4 m

27 h for two · 2 weekends★★★materials 750 – 1 569 €

A 3 × 4 × 0.12 m reinforced concrete slab with a 300 × 300 thickened edge, mesh at the bottom and 16 cast-in M12 anchor bolts — a base for a cabin, shed, greenhouse or chicken coop. A guide for advanced builders: 3-4-5 setting out, compacted gravel, reinforcement to EN 1992-1-1, ordering 3.0 m³ of C25/30 and a table for five other sizes.

€16PDF · lifetime access

Buy — €16 (lifetime) →

22 pages A4 rebar to EN 1992 dimensioned drawings shopping list

What's in this guide

Setting out with profiles: 3-4-5 right angle, diagonals ± 10
Sub-base: geotextile, 16/32 gravel compacted in two layers
Formwork level to ± 3 mm over a 14 m perimeter
Mesh with 40 cover, edge-beam cage, 16 M12 anchors
What C25/30 XC4 XF1 means and how much to order: 3.0 m³
Finishing and 7 days of curing — when to walk and build

PDF, 22 A4 pages to print for the workshop · dimensioned drawings and illustrations · shopping list on a separate page so it can be torn out and taken to the store. You download it right after payment, access is for life.

Before you start building

This guide is informational material, not construction documentation or a professional assessment. Follow the instructions of tool and material manufacturers, safety rules and local building regulations. A piece built at home is not a certified product, even where the guide follows a European standard. Structures that carry people — beds, swings, decks, pergolas, children's equipment — should be checked by a qualified person before use. To the extent permitted by law, we accept no liability for the result of your build, property damage or injury arising from the use of this guide (Terms, section 9).