Which screw to use for wood blocking?

Question

Hi All!

What screw do you use to screw wood blocking into a metal stud?

Also, which screw do you use to screw a floating vanity into the wood blocking?

There is wood blocking that is 2x6 and 1x6 in my wall.

Account Closed · Answer

@Rik Patel

You don’t want the self drilling screw. They are great for metal, but suck for wood. Their threads are too small.

Pre drill a small hole if you have to. But just use a regular coarse thread drywall screw to attach the blocking to the stud.

For the floating vanity you should use a small lag bolt or a large screw. Screws are generally not strong enough. Most times the vanity comes with its own mounting hardware.

PS I have been a commercial general contractor for over 20 years.

JD Martin · Answer

For a floating vanity I would use a regular coarse thread wood screw, not a drywall screw; they're not strong enough to resist the shear. To screw wood into metal, you'll need a coarse thread metal screw and predrill the hole.

Paul Sandhu · Answer

You might want to drill a 1/8" pilot hole into the wood for the 3/16" lag screws.  It prevents splitting, especially with larger lag screws. I do that when I hang an HDTV with a wall mount.

Rik Patel · Answer

Do you predrill or just point it at the stud and drill into the wood? @Paul Sandhu

Rik Patel · Answer

Account Closed Thanks! What size bit do you recommend for pre-drilling with that screw?

Appreciate your help!

Rik Patel · Answer

Account Closed Thanks! I used the TEKS lath metal to wood screws, do you think those are okay ?

Also, do you have any specific brand or the actual name of the large screw/small lag bolt for the floating vanity?

Account Closed · Answer

@Rik Patel

Just big enough to get the tip of the screw through. Maybe 1/8”. Once the screw “bites” into the wood it will do the rest.

Account Closed · Answer

The teks screw should be perfect. Something like this for the lag

https://www.homedepot.com/p/30...

Rik Patel · Answer

@Paul Sandhu I'll try that! and correct metal stud into wood. I was using the "teks" screws.

Paul Sandhu · Answer

You're drilling from metal and into the wood?  The self piercing screw should go right into the wood.  You can also pre drill a hole into the metal and put a lag screw with a washer through the metal and into the wood.  I would do this. 1.75" x 3/16" lag screws.

Which screw to use for wood blocking?

Most Popular Reply