Methods and arrangements for metal building roof insulation

A metal roofing system comprising:

• at least one purlin having a laterally extending upper portion;
• first and second roof clips each including a base portion secured to the upper portion of the at least one purlin, and flanged legs extending from opposite sides of the base portion;
• a thermal spacer washer assembled between the first roof clip and the at least one purlin;
• and
• a laterally extending thermal insulating spacer block including a tongue extension at a first end and spaced apart side wall extensions at a second end opposite the first end;
• wherein the tongue extension is inserted laterally between the flanged legs of the first roof clip, and the side wall extensions extend laterally around the flanged legs of the second roof clip.