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Ah thank you RandomGrinch! I was looking at American span tables which didn't even show the span length of 2x4s, my mistake. As you point out, it's over engineered for a shed! :LOL:

Hello! I'm a novice DIYer and building my first shed. I thought I'd follow the advice of some pros here https://youtu.be/b3JgPX5fVUo so I used c24 2x4s at 12 inch centres to span 8ft at 12.5° pitch. Now I've realised (from span tables) that these rafters are under the correct size. Is there...