The Real Difference Between OSB and Plywood (and Why It Matters for Air-Tight Construction)
By Graham Mann | Published: 11/2/2025
Explore the key differences between OSB and plywood for airtight construction, focusing on cost, moisture resistance, and long-term performance.
The Real Difference Between OSB and Plywood (and Why It Matters for Air-Tight Construction) When building an energy-efficient home, airtightness is crucial to reducing energy waste, improving comfort, and maintaining indoor air quality. The choice between OSB (Oriented Strand Board(https://en.wikipedia.org/wiki/Orientedstrandboard)) and plywood for wall and roof sheathing can significantly impact how well your building envelope performs. Here's the key takeaway: - OSB: Lower cost, good structural strength, but absorbs moisture more easily, which can lead to swelling and air leaks if not properly sealed. - Plywood: Higher cost, better moisture resistance, and dimensional stability, making it easier to maintain airtight seals over time. Both materials can work, but the decision depends on your budget, climate, and performance needs. Below is a quick comparison to help you decide. Quick Comparison | Aspect | OSB | Plywood | |---| --- |---| | Cost | Lower upfront cost | Higher upfront cost...
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