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-   -   trading screw length for more screws (http://www.diychatroom.com/f19/trading-screw-length-more-screws-178869/)

MLMIB 05-05-2013 09:57 PM

trading screw length for more screws
 
I have a conundrum. I want to mount a TV mount above my fireplace to hang my TV. The mount is a "dynamic" mount, in that you can pull the TV down to eye level so you're not looking up at it, so there will be some stress on it beyond just supporting the TV.

So the company recommends 3" lags, problem is that while I have 2x4's on the wall, they are mounted sideways, so I'd be drilling into the 4 inch face, only 2 inches, er, really 1.5 inches deep.

So they say you need 4 of these 3" lags. Could I get away with 8 1.5" lags? Is there a formula that will take depth of the screw and screw diameter to calculate it's various strengths (sheer, pull out, vertical load)

any thoughts much appreciated.

PS- behind the studs are brick, and I've had bad experience screwing into brick so I'm trying to stay away from it. Also, screwing into the brick around a fireplace seems like it could be trouble to me, so if I can avoid it I thought it better to.

GBrackins 05-05-2013 10:34 PM

isn't there a 2" air space between your wood framing and the fireplace brick?

MLMIB 05-06-2013 09:53 PM

Quote:

Originally Posted by GBrackins (Post 1173449)
isn't there a 2" air space between your wood framing and the fireplace brick?

pulled back the wood paneling a bit above the mantel and confirmed it's 2x4's set up odd way (looking at 4" side rather than 2" side) and does not appear to be a 2" gap.

Thoughts?

user1007 05-06-2013 09:58 PM

Lots of articles out there about whey you should never mount a television above a fireplace. If that matters to you.

http://lifehacker.com/5993910/why-mo...er-a-good-idea

Substituting more screws for those the correct length is not going to work.

I would think about some sort of expansion bolts, or perhaps some masonry anchors into the brick? If there is space between some sort of molly or butterfly bolt might work.

MLMIB 05-06-2013 10:17 PM

Quote:

Originally Posted by sdsester (Post 1174061)
Lots of articles out there about whey you should never mount a television above a fireplace. If that matters to you.

http://lifehacker.com/5993910/why-mo...er-a-good-idea

Substituting more screws for those the correct length is not going to work.

I would think about some sort of expansion bolts, or perhaps some masonry anchors into the brick? If there is space between some sort of molly or butterfly bolt might work.

The second and third point in the article are why I'm buying this specific mount...

http://dynamicmounting.com/

(for point 1, I don't use the fireplace much, and can't imagine it's going to change greatly)

I'll have to read more about the suggestion on screws

user1007 05-06-2013 10:22 PM

Posted this awhile back. Perhaps it will help explain types of fasteners that might work depending on your wall composition.

http://www.diychatroom.com/f98/faste...-chart-176906/

nightriderrv 05-07-2013 07:43 AM

No TV above the fireplace anytime :no:

mj12 05-07-2013 07:54 AM

drill the wood, then drill the brick, but not to far. Then put one of those plastic plugs,( leave the shoulder on the plug) on the tip of the screw, screw until it is tight. I have attached many handrails to brick this way and has always held up well to the savages. Oh I mean tenants.

jagans 05-07-2013 08:44 AM

To be honest with you, from reading your post, I still do not know what your are attaching to, because you are not explaining it well. What is the makup of your wall starting from the outside to the inside?

Is it panneling, then horizontal furring, then brick, then studs? or is it Brick, then horizontal 2 x's, then panneling then what vertical 2 x's?

Of another matter, you are going to get tired of holding your head at the angle necessary to look at a TV that is up high, and you will get a sore/ stiff neck from it. Your head is heavy, and needs to be balanced while viewing, not to mention what heat does to electronics.

Pittsville 05-07-2013 12:03 PM

Think outside the box. (or wall in this case) Why not attach additional 2x4s on their face on the outside of the wall? You can nail them to the existing 2x4s using 10d or 16d nails, depending on the thickness of your paneling/wall finish. This will give you 3" of lumber to lag into. Trim out the sides of the 2x4s on the outside of the wall and make it look nice. Be creative.

MLMIB 05-07-2013 08:05 PM

http://i.imgur.com/PM1bJVa.jpg

So thats the room, there is another built in on the right side as well.

The wood panel goes across that side of the room and it is mounted on 2x4's that at 16" on center. The 2x4's are mounted such that they are 2" deep and 4 inches wide. Therefore if I drilled into I could only get 1.5" of real wood.

The idea of putting another 2x4 on it is an awesome idea. Only downside is that the wall there wouldn't be flush with the across the other side since the built in's would have that wall be 1.5" further back. Any idea's on if that would look horrible? or would it be lost due to the side of the book shelf?

Also, is brick around a fireplace double thick?

Thanks for the help


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