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Mounting TV on a weird wall that has some material between the drywall and stud

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1

So I have a strange wall construction in part of my house. I'm mounting an articulating mount, up to 55", in a stud.

I took out a cable outlet and box to see the construction because I wasn't finding any studs.

Starting from the room it's 1/2" drywall, 3/8" drywall, 1" foam, 2.25" actual length stud, then gap, then I think furring, then masonry exterior.

I'm thinking some 4.25" lag bolts into the stud will hold, but it's so bizarre I wanted to double check.

drywall mounting studs masonry

share|improve this question

edited 27 mins ago

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asked 4 hours ago

kchingerkchinger

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add a comment | 

1

So I have a strange wall construction in part of my house. I'm mounting an articulating mount, up to 55", in a stud.

I took out a cable outlet and box to see the construction because I wasn't finding any studs.

Starting from the room it's 1/2" drywall, 3/8" drywall, 1" foam, 2.25" actual length stud, then gap, then I think furring, then masonry exterior.

I'm thinking some 4.25" lag bolts into the stud will hold, but it's so bizarre I wanted to double check.

drywall mounting studs masonry

share|improve this question

edited 27 mins ago

200_success

203312

asked 4 hours ago

kchingerkchinger

63

New contributor

kchinger is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

So I have a strange wall construction in part of my house. I'm mounting an articulating mount, up to 55", in a stud.

I took out a cable outlet and box to see the construction because I wasn't finding any studs.

Starting from the room it's 1/2" drywall, 3/8" drywall, 1" foam, 2.25" actual length stud, then gap, then I think furring, then masonry exterior.

I'm thinking some 4.25" lag bolts into the stud will hold, but it's so bizarre I wanted to double check.

drywall mounting studs masonry

share|improve this question

edited 27 mins ago

200_success

203312

asked 4 hours ago

kchingerkchinger

63

New contributor

kchinger is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 27 mins ago

200_success

203312

asked 4 hours ago

kchingerkchinger

63

New contributor

kchinger is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 27 mins ago

200_success

203312

asked 4 hours ago

kchingerkchinger

63

New contributor

kchinger is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 27 mins ago

200_success

203312

edited 27 mins ago

200_success

203312

asked 4 hours ago

kchingerkchinger

63

New contributor

kchinger is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

kchingerkchinger

63

1 Answer
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5

Trying to mount an articulating arm that is designed to mount to a single stud will not stand up mounted to that type of wall construction. Even with long lag bolts there is just too much chance that mount will move around and cut into the drywall, become loose and make a mess of things.

What you should be doing is to mount a panel of good quality 3/4" plywood that is large enough to span across at least two studs with three preferred. Make the height of this panel at least three times greater than the arm's mounting bracket. Use multiple large screws to mount the plywood into place into each stud. Now you can mount the articulating arm to the plywood surface and be assured of a secure attachment that will stay tight and firm against the wall.

You can sand and paint the plywood to match the wall color and it will hardly be noticable behind the TV. If you use flat head screws to mount the plywood they can be countersunk and then spackled over to make a nice flat surface.

share|improve this answer

edited 2 hours ago

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed. The problem with lag bolts is that, with all that soft material between the studs and the base of the arm, you're depending on the bending strength of the lag bolts, which isn't how they're meant to be used.
  
  – Daniel Griscom
  3 hours ago
  

  
  
  
  

add a comment | 

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5

Trying to mount an articulating arm that is designed to mount to a single stud will not stand up mounted to that type of wall construction. Even with long lag bolts there is just too much chance that mount will move around and cut into the drywall, become loose and make a mess of things.

What you should be doing is to mount a panel of good quality 3/4" plywood that is large enough to span across at least two studs with three preferred. Make the height of this panel at least three times greater than the arm's mounting bracket. Use multiple large screws to mount the plywood into place into each stud. Now you can mount the articulating arm to the plywood surface and be assured of a secure attachment that will stay tight and firm against the wall.

You can sand and paint the plywood to match the wall color and it will hardly be noticable behind the TV. If you use flat head screws to mount the plywood they can be countersunk and then spackled over to make a nice flat surface.

share|improve this answer

edited 2 hours ago

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed. The problem with lag bolts is that, with all that soft material between the studs and the base of the arm, you're depending on the bending strength of the lag bolts, which isn't how they're meant to be used.
  
  – Daniel Griscom
  3 hours ago
  

  
  
  
  

add a comment | 

5

Trying to mount an articulating arm that is designed to mount to a single stud will not stand up mounted to that type of wall construction. Even with long lag bolts there is just too much chance that mount will move around and cut into the drywall, become loose and make a mess of things.

What you should be doing is to mount a panel of good quality 3/4" plywood that is large enough to span across at least two studs with three preferred. Make the height of this panel at least three times greater than the arm's mounting bracket. Use multiple large screws to mount the plywood into place into each stud. Now you can mount the articulating arm to the plywood surface and be assured of a secure attachment that will stay tight and firm against the wall.

You can sand and paint the plywood to match the wall color and it will hardly be noticable behind the TV. If you use flat head screws to mount the plywood they can be countersunk and then spackled over to make a nice flat surface.

share|improve this answer

edited 2 hours ago

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Agreed. The problem with lag bolts is that, with all that soft material between the studs and the base of the arm, you're depending on the bending strength of the lag bolts, which isn't how they're meant to be used.
  
  – Daniel Griscom
  3 hours ago
  

  
  
  
  

add a comment | 

Trying to mount an articulating arm that is designed to mount to a single stud will not stand up mounted to that type of wall construction. Even with long lag bolts there is just too much chance that mount will move around and cut into the drywall, become loose and make a mess of things.

What you should be doing is to mount a panel of good quality 3/4" plywood that is large enough to span across at least two studs with three preferred. Make the height of this panel at least three times greater than the arm's mounting bracket. Use multiple large screws to mount the plywood into place into each stud. Now you can mount the articulating arm to the plywood surface and be assured of a secure attachment that will stay tight and firm against the wall.

You can sand and paint the plywood to match the wall color and it will hardly be noticable behind the TV. If you use flat head screws to mount the plywood they can be countersunk and then spackled over to make a nice flat surface.

share|improve this answer

edited 2 hours ago

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

share|improve this answer

edited 2 hours ago

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488

answered 3 hours ago

Michael Karas♦Michael Karas

45.5k53488