PUF sandwich panels are widely used for industrial warehouses because they provide excellent thermal insulation, durability, faster installation, and a clean finished appearance. However, before ordering PUF roof panels or wall panels, it is important to calculate the required quantity correctly.
An inaccurate estimate can result in excess material, unnecessary project costs, or shortages that may delay installation. Calculating PUF panel requirements involves more than simply measuring the floor area of the warehouse. Roof dimensions, wall height, panel width, roof slope, openings, overlaps, and material wastage all need to be considered.
This guide explains how to calculate the approximate quantity of PUF panels required for a warehouse.
Understand the Warehouse Dimensions
The first step is to collect accurate measurements of the warehouse.
You will generally need:
Warehouse length
Warehouse width
Wall height
Roof slope
Roof length
Number and size of doors
Number and size of windows
Other openings or ventilation areas
For example, assume a warehouse has the following dimensions:
Length: 30 metres
Width: 20 metres
Wall height: 6 metres
The calculation for PUF wall panels and PUF roof panels should be done separately because their installation areas and panel requirements are different.
Calculate the PUF Wall Panel Area
To calculate the wall panel requirement, first determine the total surface area of all four warehouse walls.
For a rectangular warehouse:
Total Wall Area = 2 × (Length × Height) + 2 × (Width × Height)
Using our example:
Long-side walls:
30 m × 6 m = 180 sq. m
Since there are two long walls:
180 × 2 = 360 sq. m
Short-side walls:
20 m × 6 m = 120 sq. m
For two short walls:
120 × 2 = 240 sq. m
Therefore:
Total Wall Area = 360 + 240 = 600 sq. m
The warehouse would require approximately 600 square metres of PUF wall panels before deducting openings.
Deduct Doors and Window Openings
Warehouses normally have shutters, doors, windows, ventilation openings, and other areas where wall panels are not required.
Suppose the warehouse has:
Two shutters measuring 5 m × 5 m each.
Area of one shutter:
5 × 5 = 25 sq. m
For two shutters:
25 × 2 = 50 sq. m
If there are additional windows with a combined area of 10 sq. m:
Total openings:
50 + 10 = 60 sq. m
Therefore:
Net Wall Panel Area = Total Wall Area – Total Opening Area
600 – 60 = 540 sq. m
The approximate net requirement for wall panels would therefore be 540 square metres.
However, a certain percentage should normally be added for cutting, site conditions, design requirements, and wastage.
Calculate the PUF Roof Panel Area
Calculating roof-panel requirements requires particular attention because the actual roof surface is usually larger than the warehouse floor area due to roof slope.
For a basic preliminary estimate, the warehouse plan area can first be calculated:
Length × Width
30 × 20 = 600 sq. m
However, ordering roof panels based only on this figure may underestimate the actual material requirement.
If the warehouse has a sloping roof, calculate the actual slope length from the ridge to the eave.
For example, if the actual combined roof surface after considering the slope measures approximately 620 sq. m, then around 620 sq. m of PUF roofing panels would be required before considering wastage, projections, overlaps, and site-specific requirements.
For accurate project estimation, the roof drawing and actual slope dimensions should always be used.
Check the Effective Cover Width of the PUF Panel
PUF panels are manufactured in different dimensions and profiles. When determining the number of panels, use the effective cover width rather than simply using the overall physical width of the panel.
The effective cover width represents the area covered after the panels are properly joined.
For example, if a particular PUF wall panel provides an effective coverage width of 1 metre and the wall is 30 metres long:
Number of Panels = Wall Length ÷ Effective Panel Width
30 ÷ 1 = 30 panels
If each panel is installed vertically and the required wall height is 6 metres, approximately 30 panels of the required length would cover that particular wall, subject to doors and other openings.
Always confirm the effective coverage dimensions of the selected PUF panel before placing an order.
Consider the Required Panel Length
PUF panels are commonly supplied in project-specific lengths depending on manufacturing, transportation, structural design, and installation requirements.
For wall applications, panel length may correspond closely to the building height when panels are installed vertically.
For roofing applications, the required panel length depends on the distance from the roof ridge to the eave.
For example, if the slope length from the ridge to the edge of the roof is 11 metres, the roofing-panel requirement should be calculated using that slope length rather than simply using half of the building's horizontal width.
This helps reduce unnecessary joints and improves overall roof performance.
Include Roof Overhangs
Warehouse roofs often extend beyond the wall structure to provide additional protection from rainwater.
These roof overhangs must be included in the panel calculation.
For example, if the building width is 20 metres but the roof includes additional projections on both sides, the effective roof dimensions will be greater than the warehouse footprint.
Ignoring these projections can result in insufficient roofing material being ordered.
Therefore, always calculate using the actual roof dimensions shown in the structural or architectural drawings.
Add an Allowance for Wastage
Even with accurate measurements, it is generally advisable to include a reasonable material allowance.
Additional panels or material may be required because of:
Cutting around openings
Corner adjustments
Roof penetrations
Installation damage
Design modifications
Panel layout requirements
Site measurement differences
The appropriate allowance depends on the complexity of the building and the panel layout. Simple rectangular warehouses may have relatively little wastage, while buildings with multiple openings, corners, extensions, or complicated roof structures may require a higher allowance.
The final quantity should therefore be confirmed with the panel manufacturer, installer, or project engineer.
Don't Forget Accessories
PUF panels are only one part of a complete warehouse roofing and cladding system.
Depending on the project, additional accessories may include:
Ridge flashing
Corner flashing
Barge flashing
Drip flashing
Gutters
Fasteners
Screws
Washers
Sealants
Foam fillers
Supporting structural members
These components should be calculated separately based on the warehouse design.
Correct accessories and proper installation are important for maintaining weather resistance, joint performance, and long-term durability.
Example of Total PUF Panel Requirement
Consider the warehouse used in our example:
Warehouse dimensions: 30 m × 20 m × 6 m
Approximate net wall panel area after deducting openings:
540 sq. m
Assumed actual roof surface area:
620 sq. m
Total approximate PUF panel area:
540 + 620 = 1,160 sq. m
An appropriate allowance can then be added depending on the project's drawings, cutting requirements, panel arrangement, and installation conditions.
Therefore, the final quantity should be considered a project-specific calculation rather than simply ordering exactly 1,160 sq. m of material.
Factors That Can Change the Required Quantity
Several factors can affect the final PUF panel requirement for a warehouse, including:
Warehouse design: Complex structures require more cutting and custom panels.
Roof slope: A steeper roof increases the actual roofing surface.
Panel profile: Different roof and wall panels may have different effective coverage widths.
Openings: Doors, shutters, windows, ventilators, and equipment openings reduce the wall-panel area.
Panel orientation: Vertical and horizontal installation methods can affect panel layout.
Panel length: Optimising panel lengths can reduce joints and material wastage.
Architectural details: Canopies, partitions, extensions, parapets, and other features may increase material requirements.
Why Accurate PUF Panel Calculation Matters
Accurate material estimation helps control project costs and improves construction efficiency. Ordering too many panels can increase material and transportation costs, while ordering too few can result in additional shipments and project delays.
A proper panel layout also helps reduce unnecessary cutting, improve installation speed, and create a cleaner finished structure.
Before finalising your order, it is advisable to provide the warehouse drawings and dimensions to an experienced PUF panel manufacturer so that panel quantities, lengths, thicknesses, profiles, and accessories can be properly planned.
Choose Viraat Industries for PUF Sandwich Panels
Viraat Industries provides high-quality PUF roof panels and PUF wall panels for warehouses, factories, industrial buildings, cold storage facilities, commercial structures, and other prefabricated applications.
With advanced manufacturing capabilities and a wide range of insulated panel solutions, Viraat Industries can support projects with suitable panel specifications based on application and project requirements.
If you are planning a new warehouse, accurate measurements and panel planning can help optimise material usage and simplify installation.
Contact Viraat Industries with your warehouse dimensions or project drawings to determine the appropriate PUF panel requirements for your project.
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