XPS typically has an R-value per inch of about

Prepare for the NCCR Insulation Test with flashcards and multiple choice questions, each with hints and explanations. Ace your exam and boost your career opportunities!

Multiple Choice

XPS typically has an R-value per inch of about

Explanation:
XPS insulation is valued for its ability to resist heat flow efficiently in a relatively thin layer, and the measure used is R-value per inch. The material’s closed-cell structure gives it a lower thermal conductivity than many other insulations, which translates to about R-5 for each inch of thickness. So, when you hear a typical value for XPS, think roughly five per inch. This means a thicker board increases resistance proportionally (for example, two inches around R-10, five inches around R-25), though exact numbers can vary slightly by product and conditions. The other options reflect values either lower or higher than the common XPS range, so they don’t match the usual performance of extruded polystyrene.

XPS insulation is valued for its ability to resist heat flow efficiently in a relatively thin layer, and the measure used is R-value per inch. The material’s closed-cell structure gives it a lower thermal conductivity than many other insulations, which translates to about R-5 for each inch of thickness. So, when you hear a typical value for XPS, think roughly five per inch. This means a thicker board increases resistance proportionally (for example, two inches around R-10, five inches around R-25), though exact numbers can vary slightly by product and conditions. The other options reflect values either lower or higher than the common XPS range, so they don’t match the usual performance of extruded polystyrene.

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