l'm a GC in Texas. I have a sub that was fired from a job for inability to perform the job. Given multiple chances to correct his mistakes but could not remedy his own mistakes. Now he has filed a pre-lien with us and the homeowner for $140,000 more than he was hired to complete. He never sent us an invoice, for the work he completed in which he was overpaid on per our contract already. He also hasn't sent us any details regarding his $140K Claim. His pre-lien notice is very vague. Question : Is a sub required to submit an invoice to the GC prior to making or filing a lien? Question 2: Would purchasing a surety bond for the homeowner prevent or "shield" the homeowner in event he files a frivolous lien? This would be during construction.