The ufer grounding system is for electrical safety to prevent electrical shock - and is not designed to handle an indirect and certainly not a direct lightning strike. If lightning is your concern then you should have a lightning protection system installed by a UL listed installer. Door-to-door sales installers are not UL listed so you will have no idea if the system was installed to NFPA780, the national standard on lightning. Listed installers will drive a sufficient number of ground rods to the proper depth - usually 8 ft. copper clad rods (not rebar) 2 ft below grade beyond the drip line from the roof. In some cases they may need to go as deep as 30 ft. - but thats the installers problem - not yours.
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