SDS Screw


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Old 10-26-05, 09:05 AM
rdhamm's Avatar
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SDS Screw

I read somewhere about an SDS screw. These apparently are used for attaching ledger boards for decks insstead of lags.

What exactly are they?
What does SDS stand for?
Where can I get them?

Thanks.
 
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Old 10-26-05, 11:14 AM
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rdhamm,

All answers here,

http://www.strongtie.com/products/co...rs/screws.html

Any major lumber yard, possibly a bix store.

Hope this helps!
 
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Old 10-26-05, 01:04 PM
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Thanks Doug

I'm a bit confused. It seems that SDS is a trade name by Simpson.

I'm not sure, but do codes often refer to manufacturer specific items? That seems odd to me.

Perhaps I am wrong and SDS is a generic name, like 'lag'.
 
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Old 10-26-05, 01:40 PM
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rdhamm,

It is a Simpson Screw - Strong Driver - That is what they use for their abbreviations on products.

It looks like a lag and performs like a lag screw. No difference.

Hope this helps!
 
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Old 10-28-05, 03:30 AM
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Hope it's OK to add one more thought here. The main difference in SDS screws and lags is that the SDS don't need to be pre-drilled. Apparently, this is why some counties are requiring them now and not accepting lags....guess too many lags were being improperly pre-drilled, or not drilled at all.
 
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Old 10-28-05, 07:24 PM
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The shear strength of an SDS is about double that of a common lag bolt. That, and improper predrilling is why many counties are not allowing lag bolts to attach a ledger board. I happen to be in one of the first counties that refused to recognize lag bolts. If I attach a deck via a ledger board, I almost alway have to thru-bolt it. Therefore, I do mostly free-standing decks. And a free-standing deck will NEVER result in a hole in the siding that water or moisture can enter into and rot the framing of the house.
 
 

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