Sandwich Panel Quantity Calculator
Surcharge rate %, include
Please check.
- The panels must be calculated based on the 'effective width (usually 1,000mm]' excluding the section where the male and female grooves are assembled, so that the actual construction area can be filled without any shortage.
- To ensure safe waterproofing and prevent leakage, roof panels must be ordered with an 'overlap' section (150–200mm] added to the actual diagonal length, where the top panel covers the bottom panel.
- You must select screw bolts of the 'panel thickness + 50~70mm' specification to securely fasten them to the internal purlins (C-channels] and prevent panel detachment accidents caused by strong winds.
- You must accurately input and deduct the 'opening area' where panels are not installed, such as windows or doors, to prevent unnecessary material waste and optimize the overall construction estimate.
- For long panels of 10m or more, you must check in advance whether a trailer can enter and the crane lifting limit, and calculate and place an order for finishing materials such as L-bars (L] or U-bars (U].
Sandwich Panel Requirement Calculation Formula
To avoid errors, panel measurements must be calculated based on the 'effective width,' excluding overlapping sections during assembly. Additionally, for the roof, the length of the hypotenuse according to the slope must be taken into account.
1. Calculation of Required Panel Count
After dividing the total construction length by the effective width (usually 1,000mm], a markup rate is applied to account for cutting loss.
2. Calculation of Total Order Extension Length (m]
When placing an order, determine the total length of all panels. This figure serves as the basis for dispatching transport vehicles and calculating the material cost budget.
3. Calculation of Screw Bolt Requirements
The total number of bolts is estimated by multiplying the number of purlins (such as C-shaped steel] used to secure the panels by the number of panels.
Detailed Guide to Calculator Input Items
Please check the practical terms for each input item to ensure precise panel ordering.
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1. Panel Use
Select for wall use (flat, RP, etc.] and roof use (3-rib, 4-rib, etc.]. For roof use, additional overlap calculation is required.
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2. Panel effective width
This is the actual exposed width after assembly. The domestic standard is mostly 1,000mm.
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3. Surcharge rate
This is a margin to cover corner cutting and on-site loss. If the building is irregularly shaped or has many openings, 7–10% is recommended.
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4. Opening deduction
Prevent unnecessary material waste by entering areas where panels are not installed, such as windows or doors.
Recommended panel thickness by region (insulation standards]
These are the recommended regional standards based on the strengthened building energy conservation design standards for 2026.
Please double-check the design drawings, as the required thickness may vary depending on the insulation grade (A, B, C, etc.] and flame retardant grade (performance].
Essential Checklist for Fail-Free Construction
This is a practical checklist to reduce construction costs and prevent defects.
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Checking transport and lifting limits
If the panel length exceeds 10m, you must check in advance whether a transport vehicle (trailer] can enter and the lifting capacity of the on-site crane.
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Roof panel overlap
To prevent leakage, the top panel must overlap the bottom panel by at least 150–200 mm. Please add this overlap section to the calculated thread length when placing your order.
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Select screw bolt specifications
Typically, bolts with a length of 'panel thickness + 50~70mm' must be used to securely fasten to the internal purlin (C-shaped steel].
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Simultaneous ordering of finishing materials
When ordering panels, you can reduce transportation costs by calculating and ordering L-bars for corner finishing, U-bars for bottom fixing, and caps together.
Frequently Asked Questions (FAQ]
- Q. Why is the effective panel width set to 1,000mm?
- A. This is because, according to production specifications, the total width is approximately 1,030mm, but when excluding the part where the male and female grooves overlap during assembly, the actual exposed width becomes 1,000mm.
- Q. How do you calculate the length of the roof slope?
- A. When you know the horizontal distance and height, use this site's <strong>'Slope (Hypotenuse] Calculator'</strong> to first calculate the diagonal length, and then enter that value into the panel's vertical field.
- Q. Does the quantity vary depending on the color?
- A. The quantity is the same. However, for dark colors (black, dark gray, etc.], a 'bulging' phenomenon may occur due to thermal expansion in the summer, so it is recommended to tighten the bolts more closely and add a slight markup.