SANS 10400‑XA — Floors

Implements 5.4.1 (underfloor heating) and 5.4.2 (suspended floors by energy zone). Enter the insulation R‑values below to check compliance.

1) Project context

Energy Zone

Auto‑syncs with Basics.

UFH installed?

Suspended floor part of envelope?

Moisture‑resistant insulation (suspended)

Per 5.4.2, insulation must retain properties under moist conditions.

2) Insulation R‑values

Assembly	Insulation R (m²·K/W)	Requirement	Status
Heated slab (underfloor heating present)	or Helper: R = t/1000 ÷ k	—	—
Suspended floor (envelope)	or Helper: R = t/1000 ÷ k	—	—

5.4.1 — Heated floors: insulation R ≥ 1.0 m²·K/W to prevent heat loss to ground. 5.4.2 — Suspended floors in the building envelope: Zones 1,2,6,7 → R ≥ 1.5; Zones 3,4,5,5H → R ≥ 1.0. Moisture‑resistance of the insulation is required.