I’m installing extruded polystyrene rigid foam board over my exterior sheathing. I got a little behind schedule and now the temps have dropped to the 30s (Fahrenheit). Do I need to allow for the foam to expand in warmer weather? How big of gaps should I leave (if any) on the seams and the edges? I don’t want it to distort my siding when we get back into the 90s next summer.

  • Great question. In many years of construction I've never encountered the requirement (or need) to do so. I'll wait for those with more technical knowledge of EPS to weigh in. – isherwood Oct 11 '18 at 18:48

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