Hot answers tagged shelving
Use the silicone, contrary to some ideas expressed it does stick well to clean smooth surfaces. So well, in fact, that mechanical scraping is often the only way to remove it once cured (actually there are some chemicals, like dimethyl adipate, that soften cured silicone). If the brackets are securely mounted to the wall, silicone will grip like hell and ...
I would have no concern building this with the right fasteners. There are plenty of really nice, self-tapping, nearly indestructible construction screws to be had (random example). The key joints are at the back of the shelf, where the vast majority of the torsional stress occurs. Use whatever decorative fasteners you like at the front. Put two 4" ...
My take is that the sheer thickness of the shelves that you propose will look heavy and chunky to the point of being unattractive. I would also have concerns about the overall sturdiness of a shelf that is cantilevered off a single 2x4 screwed to the wall. If it were me I would go for a thinner style of assembly and use vertical end sides on the shelves.
Soapstone is easily worked. I'd drill holes (not all the way through) and tap them with an ordinary tap, (or even a modified screw - soapstone is really easily worked) and use machine screws or stove bolts to fasten the shelf to the brackets. To make a crude tap from a screw, grind the threads off the end and grind slots. Look at a regular tap for guidance. ...
I don't have enough reputation here to insert a comment, but I just want to say that the radiator will not work properly then. With radiators the heat spread mainly using convective transfer: the heat go up and you are blocking it with the stone.
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