Yes. Although this does depend upon the year of construction of the house, as very old houses were built to a lower standard than more recent construction. A civil engineer can come to your house and quickly tell you the approximate rating and whether it will be safe, and only will cost a couple hundred dollars. Using a professional opinion will give you peace of mind when your hear the floor creaking, and you know that it is safe.
Yes, slate is not necessary, but the level of play may not equal to even a cheap slate table.
The first difference is cost, as slate tables cost more. The second difference is weight, as a slate table weighs more than non-slate. The third difference is "playability". A non-slate table and a slate table that has less than one inch slate will not provide the same tolerances and ball reactions as compared to a quality one inch slate table. This third item is the reason all regulation pool tables are required to have one inch slate.
The end consumer is the only real buyer of a second hand pool table. Roughly 50% of the original cost of a good pool table is dealer mark-up (including set-up). A pool table supplier may purchase a used pool table for a very low cost, but their only reason for doing so is to get the slate because they have a table with damaged slate. The best way to sell a used table is internet or local classified ads.
Slate - Ardoise (if you are referring to the rock or its applications like roofing tiles) OR table rase (if you are referring to a "clean slate")
Most pool table slate comes from Italy and is cut and milled there for pool table use. From there, it is finished at the pool table manufacturer. To purchase new slate, you need to contact a pool manufacturer and convince them to sell you the slate. Because it is not an item they intned to sell, expect it to be very costly. In addition, you will most likely be responsible for drilling the slate yourself. A better option may be to look around for a used pool table that has the slate in excellent condition. This can be found in yard and garage sales, newspaper ads, Craig's List, and eBay. This most likely will be much cheaper than buying new slate.
A 7-foot slate pool table typically weighs between 700-1000 pounds, depending on the specific model and manufacturer.
It would be very expensive to purchase just the sate, but yes, you can buy just the slate. A cheaper way to get the slate is to buy a used table and simply throw away the table except for the slate.
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The floor is first leveled, if necessary. As the table is assembled, a long and a short level are used for the important surfaces. When the slate is laid on the table, the levels are again used as the slate is fastened, with very small shims used to level the slate. After the slate is fully tightened and finished, the level is checked. The level of effort required to level the table surface depends upon the quality of the table and proper assembly.
The playing surface is slate.
Slate.
This is a fancy name used to sell a 3/4 inch synthetic pool table surface that has enough slate inside of it so that they can say the word slate legally. This type of surface is not similar to a true slate pool table and will not provide a level playing surface over time.