Every roof must be strong enough to withstand harsh weather elements such as heavy downpours, snow, and extreme heat. Sandwich panels tailor-made for roofing are not only strong, but they are also lightweight. However, architects and builders must carefully select their thickness to ensure optimal performance in different scenarios.
Below, we examine the recommended sandwich panel roof thickness for different applications as stipulated by existing roofing codes and standards.
What is a Sandwich Panel Roof?
A sandwich panel roof is simply a three-layered, prefabricated panel designed to cover the top of structures such as buildings and warehouses whilst providing thermal insulation. This roofing system boasts a rigid exterior, which guarantees great impact resistance and excellent immunity against harsh weather. The exterior also doubles up as a shield for the core layer, tasked with facilitating thermal and acoustic insulation.
Why Does the Thickness of Your Sandwich Panel Roof Matter
When looking for a roofing solution, I bet that the roof’s material is always at the top of your mind. However, the thickness of the roofing panel is equally important, as shown below.
- Ensures Adherence to Local Building Standards: To guarantee safety, building authorities have a set of regulations that each sandwich panel roof must meet. Always refer to these roofing codes and standards.
- Guarantees Optimal Thermal Insulation Performance: By finding the right sandwich panel roofing with the appropriate thickness, you are guaranteed greater thermal control.
- Prevents Wind Uplift: If your structure is in a location prone to heavy winds, opting for thicker sandwich panel roofs can help prevent costly and dangerous destruction.
- Facilitates Sound Insulation: With the right roof thickness, you can block off unwanted noise from your space or, at the very least, regulate the amount and volume of sound passing through.
- Guarantees Safety: Thin sandwich panel roofs can break under force or get uplifted by heavy winds, putting you at risk. Finding thick panels prevents this, consequently guaranteeing your safety.
The Recommended Sandwich Panel Roof Thickness for Different Applications
Various internal and local authorities tasked with regulating the quality of roofing materials in a bid to guarantee safety have a set of codes and standards that stipulate the thickness of sandwich panel roofs tailored for distinct use scenarios. The recommended thicknesses are;
· Exterior Roofs
Virtually all buildings, commercial, residential, or industrial, must be roofed with sandwich panels whose thickness ranges between 50 and 100 mm. This will guarantee optimal protection, excellent thermal insulation, and prevent wind uplift.
· Large Industrial Roofs
Industrial facilities are typically subjected to tougher conditions, meaning that they necessitate relatively tougher and thicker sandwich panels. The perfect sandwich panel roof for your industrial facility should have a thickness of between 80mm and 120mm.
· Cold Regions
Structures in cold regions are often exposed to heavy rainfall and snow, which can damage your roofing panels. As such, they demand rigid sandwich panel roofs, particularly those whose thickness ranges between 100mm and 150mm. Most cold storages, for instance, are roofed using 120mm-150mm polyurethane panels.
· Fire-Resistant Roofs
Structures prone to flames, such as kitchens and evaporation rooms, require thicker sandwich roofing panels reinforced with a fire-retardant to prevent the spread of fires. Their roofing panels must have a minimum thickness of at least 100mm, and they must be made from materials with a high fire-resistance rating, such as rock wool.
· Hot Regions
Buildings or facilities in hot regions or hot climatic areas can be quite uncomfortable during summer, forcing you to incur additional air conditioning costs. To avert this, you can install sandwich panel roofs with a thickness of 60mm to 80mm. This will help with thermal insulation, consequently making them comfortable even when the sun is scorching hot.
· High Humidity Areas
Areas with relatively high humidity, such as coastal regions, require sandwich roofing panels with a thickness of at least 80mm. Furthermore, these panels must have high moisture and corrosion resistance, thus they must be made from materials such as glass and rock wool.
· Windy Areas
Only sandwich roofing panels with a thickness of at least 120mm can withstand strong winds. This elevated thickness ensures that your roof remains steady when strong winds come. It also reinforces their resistance against heavy snow loads.
Factors to Consider When Choosing the Perfect Thickness for Sandwich Panel Roofs
Whereas choosing sandwich panel roofs generally comes down to personal preference and taste, you should factor in numerous parameters, key amongst them being;
- Thermal Insulation: How pressing are your thermal insulation needs? If they are quite pressing, opt for thicker panels.
- Condensation Control: To prevent condensation on your ceiling, go for sandwich panel roofs that are thicker. This will help prevent mold growth.
- Structural Integrity: Look for panels that can bear relatively heavy loads without bending or breaking.
- Acoustic Insulation: To dampen outside noise and keep your space quiet, opt for thicker sandwich roofing panels.
- Cost-Benefit Analysis: Factor in the initial cost of purchasing the panels versus the long-term benefits or costs.
Standard Sandwich Panel Roof Thicknesses and Their Common Uses
| Core Thickness | Common Applications |
| 30-50 mm | · Sheds · Garages · Livestock housing · Verandas · Patio covers |
| 50-100mm | · Supermarkets · Commercial kitchens · Schools · Airport hangars · Food processing facilities |
| Over 100mm | · Cold storages · Chemical facilities · Noise-sensitive structures · Power plants · Data centers |
FAQs
What is the standard thickness of a sandwich panel roof?
Well, most buildings covered by a sandwich panel roof utilize panels with a thickness of between 50 and 100mm. However, structures with special needs, such as cold storage facilities, require thicker roofing panels with a thickness of over 100mm.
What sandwich panel thickness is perfect for roofs?
The perfect thickness for your sandwich roofing panels is determined by the uniqueness of your application. For instance, a thickness of 30-50mm would be perfect for a shed or a veranda. It would, however, be insufficient for a cold storage, which necessitates a thickness of at least 100mm.
Does the thickness of your roof sandwich panels affect insulation?
Yes. Thicker sandwich panels are more effective at blocking or regulating heat transfer, making them excellent thermal insulators.
Can you use 4mm polycarbonate sandwich panels for roofing?
No. Whereas polycarbonate sandwich panels can be used for exterior roofing, 4mm polycarbonate sandwich panels lack the structural integrity needed to provide safety when installed as roofing. They would break easily and provide poor thermal insulation.
Partner with Lutonpanel
Lutonpanel is a leading sandwich panel manufacturer in China with over 15 years of experience in the industry. Our roof panels feature a wide range of core materials including PUR/PIR, Rockwool, or EPS with varying thickness from 10mm to 100mm.
So, if your project requires a panel with a specific R-value, thickness or finish, Lutonpanel offers 100% custom solutions – Talk to our sales team now.
