Setting Up Timber Stripping Under a Tin Roof

https://station-wiki.win/index.php/Does_a_Steel_Roof_Covering_Required_an_Underlayment%3F

Overlap the shingles the very same amount you would if you were nailing them to the roofing system without the air vent, that is, just enough to cover the nails. Get rid of all the roof shingles caps from the roofing