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Posted by M on November 26, 2006, 7:56 am
>
> larrykwiat wrote:
>> i have a 5/8th inch osb board and a 5/8 inch plywood subfloor in my
>> upstairs bedroom. i am going to screw it in. what size screws are the
>> best. i found some 2 3/4 inch screws at the hardware store that are
>> exactly the same as some subfloor screws that were only 1 1/4 inch.
>> wondering if the 2 3/4 inch screws are to long.
>>
>> so the floor is 1 1/4 inch and the screws would be 1 1/2 longer.... is
>> that to much?
>>
>> thanks
>
> the rule of thumb I use is that a fastener should be at least twice as
> long as the material you are fastening is thick, and it should
> penetrate the wood framing by no less than 1 inch. by that logic 2
> 1/2" screws would be the minimum, and there is no harm in using some
> slightly longer.
>
I am not an expert but shouldn't you be using under layment flooring nails?
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