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SANS 10400-XA divides South Africa into six climate zones with R-value minimums between R3.2 and R3.7 for ceiling insulation. Most of Gauteng and the Free State sit in Zone 2 or 4 — confirm zone with your installer because the wrong R-value compromises both the energy rating and the resale-time Energy Performance Certificate. A TIASA-listed installer will specify the zone on the quote.

Properly installed SANS 10400-XA ceiling insulation cuts winter heating draw by roughly 25–30% on a typical Highveld home — about R200–R400 per month against a R1,200–R1,500 winter peak bill. The geyser blanket adds another R100–R150 saving on top. Payback on a R8,000–R12,000 install typically lands inside three to four winter peak seasons, sooner if grid tariffs rise.

Aerolite (glass wool) and Think Pink (Insulrod, fibreglass) are mineral fibre — cheaper per m², excellent thermal numbers, but require a dust-mask install. Isotherm is a recycled-polyester product — handles better and doesn't itch, but costs 20–30% more. All three meet SANS 10400-XA; pick on installer preference and access, since Isotherm wins on hard-to-reach attics.

Yes — a geyser blanket reduces standing heat loss regardless of how the water was heated, and the payback is short (typically 4–6 months on the energy saving). On a heat-pump system it lets the unit cycle less, extending compressor life. On a solar system it preserves the heat the sun gathered through the day for evening and overnight use.