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attaching a small high torque shelf to a plaster wall

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attaching a small high torque shelf to a plaster wall bent 04-29-2007
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Posted by bent on April 29, 2007, 12:50 am
I need to attach what would look like a small shelf (2"a x 3"b x 4"hyp): to
a plaster wall. It is to support a magnifying lamp with a clamp-on pivot
arm. The lamps weight is a bit of a beast. The shelf itself is not a
problem, I can make it out of 3/4" plywood, but I do not have experience
with this type of wall. It is not drywall, its the kind of very hard to
knock on stuff, from 70 yrs ago. The small shelf is a <||>, turned 90
degrees, for a beast of a clamp-on pivot arm to the || shelf. A small
horizontal shelf dadoed into vertical pieces bolted into an inside corner
wall will withstand the torque stresses. I have a 1/2" hammer drill and I
will need to drill into the normal wall (inside corner) both above and below
the shelf at right angles so the clamp-on pivot arm torque forces on the
shelf will be pushing on the shear of the four fasteners. The distance from
the adjacent wall will have to be the width of the 1/2 profile of the hammer
drill (maybe 2" from the inside corners, about 27" up a 8' high wall). I
have a feeling I will need to build a jig for the holes, probably with
plywood with washers hammered in spaced spade drill holes, so the masonry
bit doesn't jump all over the place. So I will be using masonry bits, but
since I have never attempted such a hold, not drilling in this type of wall,
I don't know what type of fasteners to use, or if I need to worry about
drilling out with HSS-type regular-drill for lath or whatever might be in
there from before I was born.

So the question is:
What's in there & how do I drill it out (several drills, drill holes in wood
shelf after?)?
What kind of fasteners do I use through 3/4" plywood & into wall (lag bolts,
expanding bolts)?



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Posted by Mike Hammer on April 29, 2007, 1:38 am
>
>I need to attach what would look like a small shelf (2"a x 3"b x 4"hyp): to
>a plaster wall. It is to support a magnifying lamp with a clamp-on pivot
>arm. The lamps weight is a bit of a beast. The shelf itself is not a
>problem, I can make it out of 3/4" plywood, but I do not have experience
>with this type of wall. It is not drywall, its the kind of very hard to
>knock on stuff, from 70 yrs ago. The small shelf is a <||>, turned 90
>degrees, for a beast of a clamp-on pivot arm to the || shelf. A small
>horizontal shelf dadoed into vertical pieces bolted into an inside corner
>wall will withstand the torque stresses. I have a 1/2" hammer drill and I
>will need to drill into the normal wall (inside corner) both above and below
>the shelf at right angles so the clamp-on pivot arm torque forces on the
>shelf will be pushing on the shear of the four fasteners. The distance from
>the adjacent wall will have to be the width of the 1/2 profile of the hammer
>drill (maybe 2" from the inside corners, about 27" up a 8' high wall). I
>have a feeling I will need to build a jig for the holes, probably with
>plywood with washers hammered in spaced spade drill holes, so the masonry
>bit doesn't jump all over the place. So I will be using masonry bits, but
>since I have never attempted such a hold, not drilling in this type of wall,
>I don't know what type of fasteners to use, or if I need to worry about
>drilling out with HSS-type regular-drill for lath or whatever might be in
>there from before I was born.
>
>So the question is:
>What's in there & how do I drill it out (several drills, drill holes in wood
>shelf after?)?
>What kind of fasteners do I use through 3/4" plywood & into wall (lag bolts,
>expanding bolts)?


I don't understand much of what you wrote but plaster walls will have wood
lathing behind it. (strips of wood that the plaster was applied to) You won't
need a hammer drill. If you're going to use a mansonry bit it will also go
through the lathing. You won't need a jig. Lag bolts will not work. I like to
use the type that spring open (can't think of what they're called right now)
after you push them through the wall. If the plaster wall is in good condition
it will withstand a lot of stress/torque. Also, you might want to hunt up a
stud to screw directly into.


Posted by Lew Hodgett on April 29, 2007, 2:06 am
bent says...
> I need to attach what would look like a small shelf (2"a x 3"b x 4"hyp): to
> a plaster wall.

Think moly bolts, they are designed for plastered walls.

Lew

Posted by Michael Bulatovich on April 29, 2007, 9:06 am

>I need to attach what would look like a small shelf (2"a x 3"b x 4"hyp): to
>a plaster wall. It is to support a magnifying lamp with a clamp-on pivot
>arm. The lamps weight is a bit of a beast. The shelf itself is not a
>problem, I can make it out of 3/4" plywood, but I do not have experience
>with this type of wall. It is not drywall, its the kind of very hard to
>knock on stuff, from 70 yrs ago. The small shelf is a <||>, turned 90
>degrees, for a beast of a clamp-on pivot arm to the || shelf. A small
>horizontal shelf dadoed into vertical pieces bolted into an inside corner
>wall will withstand the torque stresses. I have a 1/2" hammer drill and I
>will need to drill into the normal wall (inside corner) both above and
>below the shelf at right angles so the clamp-on pivot arm torque forces on
>the shelf will be pushing on the shear of the four fasteners. The distance
>from the adjacent wall will have to be the width of the 1/2 profile of the
>hammer drill (maybe 2" from the inside corners, about 27" up a 8' high
>wall). I have a feeling I will need to build a jig for the holes, probably
>with plywood with washers hammered in spaced spade drill holes, so the
>masonry bit doesn't jump all over the place. So I will be using masonry
>bits, but since I have never attempted such a hold, not drilling in this
>type of wall, I don't know what type of fasteners to use, or if I need to
>worry about drilling out with HSS-type regular-drill for lath or whatever
>might be in there from before I was born.
>
> So the question is:
> What's in there & how do I drill it out (several drills, drill holes in
> wood shelf after?)?
> What kind of fasteners do I use through 3/4" plywood & into wall (lag
> bolts, expanding bolts)?

You never said on what the "plaster wall" was supported, though you seem to
assume masonry.
--


MichaelB
www.michaelbulatovich.ca



Posted by Mike Hammer on April 29, 2007, 10:43 am
>
>
>>I need to attach what would look like a small shelf (2"a x 3"b x 4"hyp): to
>>a plaster wall. It is to support a magnifying lamp with a clamp-on pivot
>>arm. The lamps weight is a bit of a beast. The shelf itself is not a
>>problem, I can make it out of 3/4" plywood, but I do not have experience
>>with this type of wall. It is not drywall, its the kind of very hard to
>>knock on stuff, from 70 yrs ago. The small shelf is a <||>, turned 90
>>degrees, for a beast of a clamp-on pivot arm to the || shelf. A small
>>horizontal shelf dadoed into vertical pieces bolted into an inside corner
>>wall will withstand the torque stresses. I have a 1/2" hammer drill and I
>>will need to drill into the normal wall (inside corner) both above and
>>below the shelf at right angles so the clamp-on pivot arm torque forces on
>>the shelf will be pushing on the shear of the four fasteners. The distance
>>from the adjacent wall will have to be the width of the 1/2 profile of the
>>hammer drill (maybe 2" from the inside corners, about 27" up a 8' high
>>wall). I have a feeling I will need to build a jig for the holes, probably
>>with plywood with washers hammered in spaced spade drill holes, so the
>>masonry bit doesn't jump all over the place. So I will be using masonry
>>bits, but since I have never attempted such a hold, not drilling in this
>>type of wall, I don't know what type of fasteners to use, or if I need to
>>worry about drilling out with HSS-type regular-drill for lath or whatever
>>might be in there from before I was born.
>>
>> So the question is:
>> What's in there & how do I drill it out (several drills, drill holes in
>> wood shelf after?)?
>> What kind of fasteners do I use through 3/4" plywood & into wall (lag
>> bolts, expanding bolts)?
>
>You never said on what the "plaster wall" was supported, though you seem to
>assume masonry.

I am assuming that he thinks he needs a hammer drill with masonry bits to get
through the "very hard" plaster and then possibly switch to an HSS bit to get
through the lathing strips or "whatever might be in there."


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