When going to a job site cust complaint was no heat.Which is a basic oil fired 2 zone hydronic boiler slant fin. After finding endless amount of pex tubing not wrapped in the addict the cust said this 2nd story addittion was just done. Plumber no where to be found. I went to re-insulated the tubing for the heating system. The pex size is 1/2``.Before I do all of this for nothing is there a code in NY that you have to have 3/4`` pex and not 1/2``?