On 2/26/2022 23:09, DerbyDad03 wrote:
> My daughter and I did some simple "woodworking" today.
>
> She needed to move her exercise area from the 2nd floor to the basement.
> Her boyfriend told her that the dining room chandelier bounced violently
> when she did her jumping around stuff. She doesn't want the 90 year old
> lath and plaster ceiling to end up on the table.
>
> So, we tackled that project today.
>
> Blank canvas:
>
> https://i.imgur.com/C7HK45R.jpg
>
> Framing built with 2 x 4's and pocket screws throughout:
>
> https://i.imgur.com/tnnpo5v.jpg
>
> Semi-finished product, other than painting the exposed framing to match
> the walls and some type of shelf unit to hold her equipment and laptop:
>
> https://i.imgur.com/0qx6qpR.jpg
>
> I put a receptacle behind the TV and one on the left for her laptop.
>
> In the reflection you can see the workbench we built last year and the
> shelves we built a few months ago. 12' long, 2' deep, 7' high.

Nice! I noticed the same thing, before I moved out of Mom's house
several years ago. When she would do exercise videos in her bedroom,
above the dining room of our circa 1917 house, the chandelier would
"bounce", and I even saw the ceiling vibrate. Not good at all, for 100
year old plaster keys, especially on a ceiling, with gravity working
against it. I convinced her to switch to the living room for work-outs.

On 3/4/2022 12:28 AM, Michael Trew wrote:
> On 2/26/2022 23:09, DerbyDad03 wrote:
>> My daughter and I did some simple "woodworking" today.
>>
>> She needed to move her exercise area from the 2nd floor to the basement.
>> Her boyfriend told her that the dining room chandelier bounced violently
>> when she did her jumping around stuff. She doesn't want the 90 year old
>> lath and plaster ceiling to end up on the table.
>>
>> So, we tackled that project today.
>>
>> Blank canvas:
>>
>> https://i.imgur.com/C7HK45R.jpg
>>
>> Framing built with 2 x 4's and pocket screws throughout:
>>
>> https://i.imgur.com/tnnpo5v.jpg
>>
>> Semi-finished product, other than painting the exposed framing to match
>> the walls and some type of shelf unit to hold her equipment and laptop:
>>
>> https://i.imgur.com/0qx6qpR.jpg
>>
>> I put a receptacle behind the TV and one on the left for her laptop.
>>
>> In the reflection you can see the workbench we built last year and the
>> shelves we built a few months ago. 12' long, 2' deep, 7' high.
>
>
> Nice!  I noticed the same thing, before I moved out of Mom's house
> several years ago.  When she would do exercise videos in her bedroom,
> above the dining room of our circa 1917 house, the chandelier would
> "bounce", and I even saw the ceiling vibrate.  Not good at all, for 100
> year old plaster keys, especially on a ceiling, with gravity working
> against it.  I convinced her to switch to the living room for work-outs.
I believe even new house will bounce it you do your exercise in a
frequency the resonates with the house.
When I was in high school a modern (1968) brick and steel building, we
learned that if the class bounced on our chairs, together we could make
the building vibrate. The teacher on the floor below us loved it.
Remember the Tacoma Narrows Bridge that self destructed

On Friday, March 4, 2022 at 7:55:32 AM UTC-5, keith_nuttle@sbcglobal.net wrote:
> On 3/4/2022 12:28 AM, Michael Trew wrote:
> > On 2/26/2022 23:09, DerbyDad03 wrote:
> >> My daughter and I did some simple "woodworking" today.
> >>
> >> She needed to move her exercise area from the 2nd floor to the basement.
> >> Her boyfriend told her that the dining room chandelier bounced violently
> >> when she did her jumping around stuff. She doesn't want the 90 year old
> >> lath and plaster ceiling to end up on the table.
> >>
> >> So, we tackled that project today.
> >>
> >> Blank canvas:
> >>
> >> https://i.imgur.com/C7HK45R.jpg
> >>
> >> Framing built with 2 x 4's and pocket screws throughout:
> >>
> >> https://i.imgur.com/tnnpo5v.jpg
> >>
> >> Semi-finished product, other than painting the exposed framing to match
> >> the walls and some type of shelf unit to hold her equipment and laptop:
> >>
> >> https://i.imgur.com/0qx6qpR.jpg
> >>
> >> I put a receptacle behind the TV and one on the left for her laptop.
> >>
> >> In the reflection you can see the workbench we built last year and the
> >> shelves we built a few months ago. 12' long, 2' deep, 7' high.
> >
> >
> > Nice! I noticed the same thing, before I moved out of Mom's house
> > several years ago. When she would do exercise videos in her bedroom,
> > above the dining room of our circa 1917 house, the chandelier would
> > "bounce", and I even saw the ceiling vibrate. Not good at all, for 100
> > year old plaster keys, especially on a ceiling, with gravity working
> > against it. I convinced her to switch to the living room for work-outs.
> I believe even new house will bounce it you do your exercise in a
> frequency the resonates with the house.
>
> When I was in high school a modern (1968) brick and steel building, we
> learned that if the class bounced on our chairs, together we could make
> the building vibrate. The teacher on the floor below us loved it.
>
> Remember the Tacoma Narrows Bridge that self destructed

True, but "bouncing" isn't the main issue. The main issue is the damage that
the bouncing and jarring does to 90 - 100+ YO plaster and lath ceilings.