that is determined by a few factors. the size and spacing of the roofing members, and also the pitch of the roof. there are standard and accepted calculations in the industry and can most likely be found at a local building supply or library.
The amount of weight a curtain rod can support depends on how many support brackets are helping support it. The more supports, the more weight. If there are no supports a typical rod can hold 20-30 lbs.
A shooting table can support up to 250 pounds
buttress
buttress
To properly support any size of plant, some hole is going to be required. To merely glue a hook to the ceiling just won't hold up to the weight
One of the better residential weight loss facilities in North Carolina is The Institute of Life Style and Weight Management.
The support structure you are referring to is called a buttress. Buttresses are typically made of stone or concrete and are built adjacent to the wall, providing additional support and stability to the structure. They help to distribute the weight of the arch, vault, or ceiling and prevent the wall from buckling or collapsing due to the pressure.
I was told by a lighting specialist that code for the UK is 2.2kg for the light fitting before additional support is needed
A ceiling rose is the name given to an enclosed terminal block which enables a suspended lamp to be connected to a residence's permanent wiring. It also provides a means of gripping the flexible cable to support the weight of the light fitting.
I found several. Go to yellowpages.com and type in "residential weight loss" and then select Texas. Then click on "weight control services." You'll get a list of names, addresses and phone numbers. ~ T
the typical weight is about 200 - 400 pds. the size is usually 100 in.
The manufacturer rates the maximum supported weight of the mount as 40 pounds.