KNAUF EARTHWOOL INSULATION

50mm Knauf Ceiling Roll

Name: 50mm Knauf Ceiling Roll
Brand: Knauf Insulation
Price: 1012.00 ZAR

The 50mm Knauf Ceiling Roll is a glass mineral wool insulation option for residential ceiling applications where a thinner layer is required. With R1.25 thermal resistance and 22.80m² coverage per roll, it can be used for selected ceiling upgrades and insulation top-ups where the completed installation meets the required thermal performance. Request a VAT-inclusive quotation for supply or installation.

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Euroclass A1 Non-combustible

ECOSE® Technology No added formaldehyde

Thermal & acoustic Comfort

Knauf Earthwool glass mineral wool ceiling insulation roll

R1.25 Thermal
Resistance

50mm Knauf Price Per Roll

VAT-inclusive material price

R1,012.00 per roll

R44.39 per m² (incl. VAT)

The 50mm Knauf Ceiling Roll provides 22.80m² of glass mineral wool insulation with R1.25 thermal resistance. This thinner insulation option can be used for suitable ceiling applications and top-ups. Prices exclude delivery and installation.

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All displayed material prices include VAT
Supply-only quotations available
Installation enquiries for Johannesburg and Pretoria
Delivery costs confirmed by quotation

Technical Specifications

Thickness	50mm
R-value (South Africa)	R1.25 m²K/W
Roll coverage	22.80m²
Roll length	19.00m
Roll width	1.20m
Fire classification	Euroclass A1
Material	Glass mineral wool
Binder technology	ECOSE® Technology
Manufacturer formats	Uncut / Combi-cut

Official Knauf Technical Datasheet Ceiling Roll · September 2025

View Datasheet

Dimensions are nominal. The South African R-value is based on a 23°C mean temperature. Confirm the available roll format when ordering.

R1.25 Thermal Resistance

The 50mm Knauf Ceiling Roll provides R1.25 thermal resistance, helping reduce heat transfer through residential ceilings. Its thinner profile makes it suitable for selected insulation upgrades and top-ups where the completed installation meets the required thermal performance. The glass mineral wool also helps absorb sound.

Helps reduce summer heat gain

Helps limit heat loss during winter

Helps reduce heating and cooling demand

Glass mineral wool helps absorb sound

Where to Use 50mm Knauf Ceiling Roll

The 50mm Knauf Ceiling Roll provides R1.25 thermal resistance and is suitable for selected residential ceiling insulation applications where a thinner glass mineral wool layer is appropriate. It can be used for ceiling insulation top-ups and upgrades where installation conditions allow. As 50mm insulation provides less thermal resistance than thicker rolls, the completed insulation system must be assessed against the required thermal performance.

Ceiling insulation top-ups where suitable
Roof spaces with limited available depth
Existing ceilings with suitable access
Additional insulation above bedrooms and living areas
Layered ceiling insulation upgrades when correctly specified

Calculate How Many Rolls You Need

Enter your ceiling area to estimate the number of 50mm Knauf Ceiling Rolls required and the VAT-inclusive material cost.

Ceiling area (m²)

m²

Cutting allowance:

Please enter a valid ceiling area.

Each 50mm Knauf Ceiling Roll covers 22.80m². The calculator rounds up to complete rolls. The cutting allowance helps account for fitting and offcuts.

Your Roll Estimate

For a 50m² ceiling area:

3 rolls 68.4m² purchased coverage

Area including 5% allowance: 52.50m²

Estimated material total (incl. VAT) R 3 036,00 Based on R1,012 per complete roll. Delivery and installation excluded.

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50mm vs 75mm Knauf Ceiling Roll

The 50mm Knauf Ceiling Roll provides R1.25 thermal resistance and covers 22.80m² per roll. Compare it with the 75mm option to understand the differences in thermal performance, coverage and VAT-inclusive material prices.

Product	R-value (SA)	Roll coverage	Price per roll (incl. VAT)	Key difference
50mm Knauf	R1.25	22.80m²	R1,012.00	More coverage per roll
75mm Knauf	R1.88	15.36m²	R929.00	Higher thermal resistance

Which thickness should you choose? The 50mm roll covers 7.44m² more ceiling area per roll and costs less per square metre. The 75mm roll provides higher thermal resistance at R1.88, compared with R1.25 for 50mm. Choose according to the required thermal performance, available ceiling depth and installation conditions.

Explore Other Knauf Ceiling Roll Thicknesses

View individual product information

75mm Knauf Ceiling Roll View product 100mm Knauf Ceiling Roll View product 135mm Knauf Ceiling Roll View product

R-values and roll coverage follow Knauf's September 2025 Ceiling Roll datasheet. Prices are Earthwool's VAT-inclusive material prices. Delivery and installation are excluded.

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50mm Knauf FAQs

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What is the R-value of 50mm Knauf insulation?

The South African thermal R-value is R1.25 m²K/W. This measures the insulation's resistance to heat transfer. Higher R-values indicate greater thermal resistance.

The 50mm thickness can be suitable for selected ceiling insulation upgrades or top-ups. On its own, it may not meet the thermal requirements for every building or application. Compare thicker options in our Knauf insulation range .

How much area does one roll cover?

Each roll covers 22.80m², with nominal dimensions of 19m long by 1.2m wide. Insulation is supplied in complete rolls.

Use our roll calculator to estimate how many rolls are needed for your ceiling area, including a cutting allowance.

How much does Knauf 50mm insulation cost?

The listed material price is R1,012.00 per roll including VAT. Based on 22.80m² coverage, this works out to approximately R44.39 per m² including VAT.

Delivery and installation are quoted separately. For pricing across the full thickness range, visit our Knauf insulation prices page.

Do you offer supply and installation?

Yes. Earthwool handles supply enquiries for the 50mm Knauf Ceiling Roll and installation quotations for suitable properties in Johannesburg and Pretoria.

Provide your ceiling area and delivery location so we can confirm material quantities, availability, delivery costs and installation options. Request a quotation .

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Need 50mm Knauf Insulation Prices? Request a Quote Today.

Get a quotation for 50mm Knauf Ceiling Roll at R1,012 per roll including VAT. Tell us your ceiling area and delivery location, and we'll help confirm roll quantities, supply costs and installation options in Johannesburg and Pretoria.

VAT-inclusive pricing

Supply-only quotations

Installation enquiries

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Material price includes VAT. Delivery and installation are quoted separately. Stock availability is subject to confirmation.