Quick answer: Choose XPS compressive strength from the design loads and assembly conditions, not from a generic high-density label. Concentrated loads, long-term loading and the support layer all influence the required grade.
Identify the Load Case
Separate uniform loads from concentrated loads and temporary construction loads. Floors, roof decks, equipment bases and traffic areas can require different checks.
Use the Correct Design Evidence
A short-term test value may not equal an allowable long-term design stress. The project engineer should determine the required criteria, safety factors and deformation limits.
Specify the Offered Grade
Include the required test method and minimum result in the purchase specification. Confirm board thickness, support condition, joint layout and protective layers.
Buyer Checklist
- Provide design and construction loads
- Identify concentrated-load locations
- State the required test method
- Confirm support and cover layers
- Obtain engineering approval
Buyer FAQ
Is the highest compressive grade always best?
No. Select a grade that meets the engineered requirement and installation constraints.
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Submit Your RFQProject requirements should be verified against current official standards, product documentation and local regulations.