Sandwich Panel Quantity Calculator

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  • 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 Calculator, Perfect Calculation of Wall and Roof Requirements and Auxiliary Materials

Accurate quantity calculation is key to cost reduction with sandwich panels. We assist with error-free ordering and economical construction by precisely calculating panel quantities, order lengths, and bolt counts based on area and specifications.

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
Required number of panels = {Total construction area / (Effective panel width × Panel length]} × (1 + Markup rate]

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]
Total order length (m] = Number of final panels × Individual panel 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
Number of bolts = Number of panels × Number of fasteners per width (4] × Number of intermediate purlins

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.

  • 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.

  • 2. Panel effective width

    This is the actual exposed width after assembly. The domestic standard is mostly 1,000mm.

  • 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.

  • 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.

Applicable Areas Recommended thickness (based on EPS] division note
Central Region 1 (Gyeonggi, Gangwon, etc.] 225T ~ 260T Direct external air The strictest insulation standards
Central Region 2 (Seoul, Chungcheong, etc.] 155T ~ 220T Direct external air The roof is thicker than the walls
Southern regions (Gyeongsang, Jeolla, etc.] 125T ~ 175T Direct external air Checking regional variations is essential.
Non-existent room/internal partition 50T ~ 100T Internal compartments For simple space separation
note.

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.

  • 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.

  • 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.

  • 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].

  • 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.