Roof Insulation is a thermal layer laid over the ceiling or fixed under the roof to cut heat gain in summer and heat loss in winter. It helps homes under hot metal roofs, cold Highveld houses and anyone wanting lower heating and cooling bills. One request brings prices from local installers.
Describe the job once and get roof insulation quotes from local contractors.
Get Roofing QuotesSigns You Need More Insulation
- Hot rooms in summer. Ceilings radiate heat, especially under IBR or Chromadek roofs.
- Cold rooms in winter. Heaters run for hours with little effect.
- Thin or missing layer. Old insulation that has compressed, shifted or been removed.
- Wet or mouldy insulation. Insulation soaked by a past leak loses its value and should be replaced.
- Condensation under sheeting. Drips from metal roofs on cold mornings.
What the Work Includes
- Roof space check. Looking at access, wiring, existing insulation and leaks.
- Removing old material. Clearing wet, compressed or contaminated insulation.
- Laying new insulation. Rolling blankets between and over the ceiling joists, leaving gaps around downlights.
- Sealing gaps. Closing obvious draughts at the eaves and roof hatch.
Materials and Methods
- Glasswool. Common, cost-effective blanket. Installers wear protective gear.
- Polyester. Non-itch and easy to handle, a popular choice for retrofits.
- Thickness. 135 mm blankets are a common retrofit thickness. New builds must meet energy-efficiency rules.
- Insulated roof sheeting. Panels with insulation built in, used on new or replaced metal roofs. See roof sheeting installation.
Top-Up or Replace?
Dry, evenly spread insulation can often be topped up. Wet, mouldy or rodent-damaged insulation should come out first. If ceilings are being replaced after a leak, see ceiling repairs and do both together.
Roof Insulation Prices
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| 135 mm glasswool or polyester, supply only | R100 - R115 per m² |
| Supplied and installed | From about R140 per m² |
| Example: 100 m² ceiling, supplied and installed (100 x R140) | From about R14,000 |
| Insulated roof sheeting or panel | R550 - R800 per m² |
| Ceiling board replacement (if needed) | R180 - R460 per m² |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded, based on typical South African market rates. They are not our prices or quotations, and no contractor is bound by them. Ask whether VAT is included, and check what each quotation covers, such as scaffolding, rubble removal and call-out fees.
Get prices for your roof rather than a range. Send one request, with no obligation.
Get Roofing QuotesWhat Affects the Price
- Ceiling area. Insulation is priced per m² of ceiling.
- Removal of old material. Taking out wet or old insulation adds labour and disposal.
- Roof space access. Low-pitched or cramped roofs take longer to work in.
- Material and thickness. Thicker blankets and polyester cost more than standard glasswool.
How Getting Quotes Works
- Request. Tell us the work, your area and how to reach you. Photos help.
- Match. Your request goes to local roofing contractors suited to the job, with your permission.
- Quote. Contractors contact you, inspect if needed and give a written price.
- Compare. Check scope, materials, warranty and payment terms side by side, then hire one or nobody.
Roof Insulation FAQs
Glasswool or polyester?
Both insulate well at similar thicknesses. Polyester is easier to handle, while glasswool often costs less.
Can insulation go over downlights?
No. Leave a gap around downlights and transformers unless they are rated for contact with insulation.
Will insulation stop my roof leaking?
No. Fix leaks first, because wet insulation loses its value and can damage ceilings.
How long does an installation take?
A typical house is usually done in a day once the roof space is clear.
Related Services
Share your ceiling size with Roof Repairs South Africa and get insulation prices from local installers to compare before you decide.
Roof Repairs South Africa is a lead-generation and quote-comparison service. We do not carry out roofing work and we do not employ roofers. Work is quoted and carried out by independent contractors, and your agreement is with the one you choose. Get a written quotation, check insurance and workmanship warranties, and avoid paying the full amount upfront.
Roof Insulation. Describe what you need once and get the best quote, fast.
Get Roofing QuotesGet the Best Quote, Fast
Keep it brief. Say what needs doing, where the property is and how to reach you. Your enquiry is passed only to roofing contractors suited to the job, and you decide whether to go ahead.
Client Reviews
Powered by leaderr
