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And so, with a sigh, I marched back up the narrow stairs to my tiny studio, where all the shaking lives. And just for kicks, I placed the tripod on the bare floor, ignoring the floating panel suspended from the walls. And, to my ASTONISHMENT there was very little shaking that died out quickly, mostly my moving around. What’s going on here?
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I think we've discussed this topic before.
The problem with your house(in fact not just your house) is the timber trusses used.
Timber flexes a lot. While it's strong it's not rigid.
This is why you get vibration when you move around. It's not really vibration, just the opposing flex in the trusses on one section as you walk on the other part of the floor.
Quick and easy solution would be to tile(floor tiles.. thicker, maybe 10mm or so) the floor of the studio. Tiled properly. They add a lot of rigidity.
My house is a cruddy old run down ramshackle dwelling. Timbers are old(but strong hardwood), not the newer engineered softwood laminates they use nowadays.
But it flexes like crazy. I can walk 3(odd) meters away in my kitchen and have the camera setup on a tripod in the rear most room, and I still get shakes from the camera.
I had the washing machine going one day to do the laundry, about 5-6m two rooms away from my rearmost room. The washing machine was on it's spin cycle, I couldn't feel the vibrations travelling throughout the entire rear floor of the house, but the camera clearly displayed it.
In my bathroom, I've had some very nice, expensive marble tiles laid over the same wooden floor(over a sheet of cement sheet first, as is usual practise). Living room is the same distance apart from laundry.
With the washing machine going and deliberately set unbalanced, I get vibrations in the living room(about 10-15m away), but basically zero in the bathroom(same distance).
That was worst case scenario tho ... the washing machine was deliberately set to wash only one garment to be as unbalanced as it could be set to work.
With a normal load in the wash, I don't get the vibrations in the living room tho.
So your two options for the studio would be.
Tile the floor with some good quality floor tiles. Note that wall times are cheaper, but thinner(usually about 3-6mm) floor tiles are 6-10mm thick.
The other building works that you could have someone do for you is to add metal supporting beams to the timber trusses in the floor/ceiling interface.
A lot of work tho that means either the floor of the studio needs to be removed, or the ceiling downstairs needs to be removed/replastered.
Best case situation for you would be both metal supporting the trusses and tiling the floor. Eliminate the flex in the trusses and floorboards.
There are other options for an overall improvement to the rigidity of the floor, but all based on the same principles.
Many years ago we used to have a very large shop(restaurant) premises, that was an old historic building(protected). We had to add metal supporting to the upstairs floor structure to accommodate the people we were expecting to fill the upstairs section.
The steel truss supports were very heavy, 6mm thick plates(about 15-20m long each) two pieces sandwiched each old timber trusses, and then bolted to the brick walls at either end. Each timber truss was substantial itself, and a series of columns along the middle of each truss.
Whilst it did cost about $10K for us back then, the metal costs were minimal compared to the labour and machinery cost component.
But once done, the difference in how much more rigid the upstairs floor was was amazing.
Apart from some small amounts of looseness in the very thick floor boards (approximately 125years old!), it went from a creaking nightmare to the rock solid feeling of the downstairs concrete floor.