Stop Using The Wrong Screw & Nail for the Job!
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Published 2024-07-27
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All Comments (21)
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I would be interested in a video about the correct application of each fastener.
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Screw threads are also "stress risers" that is why you never put threads in shear load. A stress riser is the same principle as a crack in a windshield.
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Tempered construction screws solve this problem
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Why didn't you user any of the screws specifically made for framing? GRK makes some that have shear rating designed specifically for work where you would usually use a nail.
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What about lag screw and bolts??
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Figured deck screws would work just fine on a fence and wouldn't pull like nails do. Darn things shear off every now and again and I have to hang the picket again. Live and learn.
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its all about sheer factor.....nails have the higher sheer force, screws hold down, ie. decks etc
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Most of the lateral strength of a screwed connection comes from friction
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Also modern adhesive are often over looked but work well. 👍
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My rule of thumb is that if there is a lateral load, don't use a screw. With the new impact drivers, it seems like everyone wants to use screws for everything.
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Fasteners are Fascinating! There is a lot to consider when specifying fastener type for each unique application. Shear Strength, pullout value, head type, Alloy, material Finnish, thread type. So many options.
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Not really applicable to a joint, but this demonstrate fatigue strength, not the ability to resist in shear. Try again with an actual joint, and include structural rated screws as well as Lag screws/bolts. Will probably need a bigger hammer!
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Thanks for the awesome content and great videos!!
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Try the same experiment with all nails and screws drives home and actually fattening two things together rule of thumb I was always taught was that a nail just held a joint long enough for glue to dry and never as a permanent fastener this is a way too simplistic view of the Fastners world . .
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I screwed all my Perlins on a pole barn build last year. They were suppose to be rated for framing. If we didn’t naill the ends and some of the middles I’d have a broken leg. They almost all broke. Not surprising it was dead of winter in Michigan and I didn’t want to use them in the first place.
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Another tip... Regular "sheet metal" screws... if you don't NEED stainless, use regular steel! Plated or not. Stainless is really brittle by comparison. I was installing some stuff where I was going to go through about 400 screws. Bought stainless not remembering the brittle part. My tiny M12 impact on setting 6 was snapping them in half, but when I pulled them all out and went to plated steel, I had it cranked to 14 and not one snapped.
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great video. This is why you should always frame with a nailer if you can instead of screws because the structure does move and expand and contract and the framing nails will tolerate the flex and allow movement far better than screws.
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Never really considered this before. Thanks, Scott!
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Nails for California, screws everywhere else 😂
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Modulus of elasticity; very good thing to understand.
