The price of roof heat insulation is not determined solely by the price of a single roll. To determine a more realistic budget, you need to consider the roll dimensions, roof surface area, material thickness, layer type, and additional requirements during installation.
For example, one roll of roof heat insulation measuring 1 meter × 25 meters has a nominal area of 25 m². If the price of one roll is Rp900.000, the material cost is approximately equivalent to Rp36.000 per m².
However, project calculations are not always as simple as dividing the roll price by the material area. Roof shape, joints, cutting, and material waste must also be taken into account.
This article explains how to calculate roof heat insulation prices per meter, per m², the number of rolls required, and budget estimates, using Karpinux Roof Insulation as an example.
Price note: The prices in this article are starting/reference prices and may change at any time. Purchases in certain quantities may also qualify for special prices or discounts. For the latest prices, check the catalog or contact the Karya Pilar Nusantara team.
How Much Does Roof Heat Insulation Cost?
The price of roof heat insulation may vary depending on the material thickness and layer configuration.
Karpinux Roof Insulation is available in 5 mm, 8 mm, and 10 mm thicknesses, with single side and double sided options. All variants have roll dimensions of 1 × 25 meters.
Based on the starting product prices at the time this article was written:
| Thickness | Layer | Size | Starting Price / Roll |
|---|---|---|---|
| 5 mm | Single Side | 1 × 25 m | Rp900.000 |
| 5 mm | Double Sided | 1 × 25 m | Rp1.200.000 |
| 8 mm | Single Side | 1 × 25 m | Rp1.200.000 |
| 8 mm | Double Sided | 1 × 25 m | Rp1.500.000 |
| 10 mm | Single Side | 1 × 25 m | Rp1.500.000 |
| 10 mm | Double Sided | 1 × 25 m | Rp1.800.000 |
Each roll has a nominal area of:
1 m × 25 m = 25 m²
These are starting prices and do not yet account for discounts based on purchase quantity, shipping costs, installation requirements, or other project components.
For the latest quotations and bulk purchases, see the pricelist.
Roof Heat Insulation Prices per Meter and per m²
Because Karpinux has a width of 1 meter, one linear meter of material is equivalent to a nominal area of 1 m².
This means:
Price per meter = Roll price ÷ 25
and:
Price per m² = Roll price ÷ 25 m²
With these dimensions, the nominal price per linear meter and the price per m² are the same.
Estimated Prices by Variant
| Thickness | Layer | Price / Roll | Est. Price / Meter | Est. Price / m² |
|---|---|---|---|---|
| 5 mm | Single Side | Rp900.000 | Rp36.000 | Rp36.000 |
| 5 mm | Double Sided | Rp1.200.000 | Rp48.000 | Rp48.000 |
| 8 mm | Single Side | Rp1.200.000 | Rp48.000 | Rp48.000 |
| 8 mm | Double Sided | Rp1.500.000 | Rp60.000 | Rp60.000 |
| 10 mm | Single Side | Rp1.500.000 | Rp60.000 | Rp60.000 |
| 10 mm | Double Sided | Rp1.800.000 | Rp72.000 | Rp72.000 |
Example:
The price of Karpinux 8 mm Double Sided is Rp1.500.000 per roll.
Therefore:
Rp1.500.000 ÷ 25 = Rp60.000/m²
So, the nominal material cost is approximately Rp60.000 per m².
This calculation is used as a material cost estimate and does not automatically represent the installation cost per m².
How to Calculate Roof Heat Insulation Requirements
After determining the price per m², the next step is to calculate how much material is needed.
The basic formula is:
Number of Rolls = Roof Area ÷ Material Area per Roll
Since one roll of Karpinux has a nominal coverage area of 25 m²:
Number of Rolls = Roof Area ÷ 25 m²
The calculation result must be rounded up because the material is sold in rolls.
Example: A 72 m² Roof
Suppose the roof surface area to be covered with heat insulation is 72 m².
72 ÷ 25 = 2.88 rolls
Mathematically, the minimum requirement is:
3 rolls
Three rolls provide a nominal coverage area of:
3 × 25 = 75 m²
However, this figure does not yet account for cutting or installation waste.
Don't Calculate Based on Floor Area Alone
This is one of the most common mistakes.
If a building has a floor area of 10 × 10 meters, or 100 m², its roof area is not necessarily exactly 100 m².
A sloped roof has a longer surface area than the building's horizontal projection. Hip roofs, gable roofs, multiple joints, canopies, and other construction details can also increase material requirements.
Therefore, for an initial estimate, use:
The actual roof surface area, not just the building's floor area.
For new projects, this information can usually be obtained from construction drawings or shop drawings.
Is It Necessary to Add Extra Material?
Under ideal conditions, one roll measuring 1 × 25 meters provides a nominal coverage area of 25 m².
During actual installation, some material may be used for cutting, adjustments to the roof shape, joints, or sections that cannot be reused.
Therefore, actual material requirements may be higher than the result of simply dividing the roof area by the coverage area.
For illustration, if a project requires an additional 5% material allowance:
Material Requirement = Roof Area × 1.05
For a roof covering 120 m²:
120 × 1.05 = 126 m²
Then:
126 ÷ 25 = 5.04 rolls
Since purchasing 0.04 of a roll is not possible, the quantity is rounded up to:
6 rolls
This additional percentage is not a fixed standard for all projects. Material waste allowances should be adjusted according to the roof design and installation method.
Roof Heat Insulation Cost Simulation
To make the calculation easier, let's use an example of a building that requires 100 m² of material, initially excluding waste.
Number of rolls:
100 ÷ 25 = 4 rolls
The estimated material costs are:
| Variant | Quantity | Price / Roll | Estimated Total |
|---|---|---|---|
| 5 mm Single Side | 4 rolls | Rp900.000 | Rp3.600.000 |
| 5 mm Double Sided | 4 rolls | Rp1.200.000 | Rp4.800.000 |
| 8 mm Single Side | 4 rolls | Rp1.200.000 | Rp4.800.000 |
| 8 mm Double Sided | 4 rolls | Rp1.500.000 | Rp6.000.000 |
| 10 mm Single Side | 4 rolls | Rp1.500.000 | Rp6.000.000 |
| 10 mm Double Sided | 4 rolls | Rp1.800.000 | Rp7.200.000 |
Therefore, for a nominal area of 100 m², the starting material cost ranges from Rp3.6 million to Rp7.2 million, depending on the selected specifications.
These figures are only simulations based on starting prices. Actual prices may change, and project-volume purchases may have different pricing arrangements.
Check the latest prices and quantity-based discounts through the catalog.
What Makes Roof Heat Insulation Prices Different?
When comparing roof heat insulation prices, don't focus only on the price per meter. Materials with different prices may also have different structures and specifications.
Karpinux uses a system based on closed-cell XLPE foam and an aluminum foil layer. The product website lists a material thermal conductivity of 0.030 W/m·K and radiation reflectivity of up to 97%.
Factors to consider include foam thickness, the number of foil-coated sides, insulation material composition, roll dimensions, thermal characteristics, installation requirements, and purchase quantity.
This means that comparing products based solely on "Rp per meter" does not necessarily provide an equivalent comparison.
5 mm, 8 mm, or 10 mm: Which Should You Choose?
Thickness should not be determined based on price alone.
Karpinux divides its product options into three categories. 5 mm is intended for renovations, lightweight buildings, or applications requiring minimal additional thickness. 8 mm offers a more balanced option for warehouses, workshops, and commercial buildings. Meanwhile, 10 mm is intended for factories, work areas with higher heat exposure, and applications requiring a thicker foam layer.
Since material thickness also affects the price, the specifications should be matched to the building's requirements rather than immediately choosing the cheapest or thickest variant.
For a more detailed discussion on selecting the appropriate thickness, you can also read the article:
Roof Insulation Thickness: 5 mm, 8 mm, or 10 mm – Which Should You Choose?
Single Side or Double Sided?
In addition to thickness, the surface configuration also affects the price.
Single Side uses a layer on one side, while Double Sided uses a configuration with layers on both sides. Karpinux provides both options in 5 mm, 8 mm, and 10 mm thicknesses.
The selection should follow the construction design and project requirements. Double sided should not simply be understood as being "twice as cool" as single side.
The performance of the reflective layer is also influenced by the material's position within the construction system and the presence of an air gap around the reflective surface.
How to Calculate Your Budget Quickly
For an initial estimate, use the formula:
Roof Area → Add Material Allowance → Divide by 25 m² → Round Up → Multiply by Price per Roll
Example:
Roof surface area: 230 m²
Allowance: 5%
Material: Karpinux 8 mm Double Sided
Starting price: Rp1.500.000/roll
Material requirement calculation:
230 × 1.05 = 241.5 m²
241.5 ÷ 25 = 9.66 rolls
Rounded up to:
10 rolls
Estimated material cost:
10 × Rp1.500.000 = Rp15.000.000
Therefore, the initial estimated material cost is approximately Rp15 million.
This amount does not yet account for quantity discounts or other project requirements.
Material Prices Are Not Necessarily the Same as Installation Costs per m²
Searches for roof heat insulation prices per m² sometimes have two different meanings:
material price per m² or material + installation cost per m².
The prices shown in the tables above are estimates for Karpinux materials only.
The total project cost can be influenced by roof conditions, site accessibility, work area, installation methods, the number of joints, requirements for removing the existing roof, labor, transportation, and supporting components.
Therefore, when requesting a quotation, it is advisable to clarify whether you need the material price only or a quotation that also covers project requirements.
Conclusion: Calculate Based on Roof Area, Not Just Price per Roll
Determining the cost of roof heat insulation becomes easier when the material dimensions are known.
With Karpinux dimensions of 1 × 25 meters, one roll has a nominal area of 25 m². Based on current starting prices, the estimated material cost ranges from Rp36.000 to Rp72.000 per m², depending on thickness and the choice of single side or double sided.
However, the price per m² is only the starting point.
To obtain a more accurate estimate, calculate the actual roof surface area, consider cutting requirements and material allowances, then determine the appropriate thickness and configuration.
Karpinux Roof Insulation is available for applications ranging from renovations and lightweight buildings to warehouses, workshops, commercial buildings, and industrial areas.
For the latest prices, discounts on purchases of certain quantities, and consultation regarding project requirements, check the catalog & pricelist or contact PT Karya Pilar Nusantara.
FAQ: Roof Heat Insulation Prices
How much does roof heat insulation cost per meter?
Based on Karpinux starting prices, the estimated cost ranges from approximately Rp36.000 per meter for 5 mm Single Side to approximately Rp72.000 per meter for 10 mm Double Sided. Prices may change, and purchases in certain quantities may qualify for special quotations.
How much does roof heat insulation cost per m²?
Because Karpinux rolls have a width of 1 meter, the nominal price per m² is the same as the price per linear meter, which is approximately Rp36.000–Rp72.000/m², depending on the variant.
How many meters are in one roll of heat insulation?
Karpinux uses rolls measuring 1 × 25 meters, providing a nominal area of 25 m² per roll.
How many rolls are needed for a 100 m² roof?
Nominally:
100 ÷ 25 = 4 rolls.
However, actual requirements may be higher if cutting, joints, or additional material allowances are needed.
Are discounts available for bulk purchases?
The displayed prices are starting prices. Purchases in certain quantities may qualify for special offers. Check the pricelist or consult the team regarding your project requirements to obtain the latest prices.
