Through Fastened Metal Roofing Contractor
A through fastened metal roofing panel here in Northwestern Pennsylvania usually has five ribs and is made of 29 gauge metal . It always has the fasteners open to the elements. Some folks call this an exposed fastener metal roofing panel.
Now with that in mind the fastener itself is painted to match the metal roofing panel and preset with a neoprene washer. This is to seal the head of the metal roofing screw to the deck and keep out the elements like rain and snow. I use a metal roofing screw that has a stainless steel cap. The cap encases the washer and will never rust out. Warning: Over tightening a metal roofing screw has a tendency for the neoprene washer to fail as time progresses. Once the washer fails you have just sent out an invitation for water intrusion.
Regardless of what metal roofing system we are installing. I always cut in the ridge for ventilation and use FloVent. This product installed at the ridge line lets your attic breath. Assuming you have an up to snuff working soffit system. An attic ventilation system that will create some positive pressure in the attic moving unwanted hot air out of the attic in the summer and out of the eaves in the winter. Attic insulation also plays a big role in your roof system.
Titanium UDL 30 & 50 are great synthetic underlayments for metal roofing systems. This product creates a scratch resistant barrier between the metal roofing panel and the old roof system. What I mean by that is when installing a metal roof system in Northwestern Pennsylvania your old roof system doesn't get torn off 99% of the time. The old roof system gets buried simply because most folks can't afford the additional costs of tearing it off and the new metal roofing system. Now burying your old roof system doesn't affect the manufacturer warranty or code officer looking after your quality work. What it will affect is the next owners pocket book when they do a new roof. Titanium UDL will also create a water repelling roof system. It performs great in high temperature conditions and is certified 20% reclaimed material.