Vapor Barrier Under Metal Roof – If this is so, then you will find there are lots of alternatives out there in the roofing industry. These options can range from several variants of asphalt shingle types to many variations of alloy panels. One of the many questions which are presented to a professional contractor would be ” can metal roof be installed over shingles?” . The dichotomous nature of installing metal over an existing shingle roof requires lots of steps. We will analyze these steps in greater detail to help determine if retrofitting a metallic roof over an existing asphalt shingle roof is a complex idea.
metal roof over shingles
There are numerous things you must consider before choosing to put in a metal panel roof over an existing asphalt shingle roof. The very first thing that has to be determined is if the roof plywood or plank board decking is secure and solid underneath the existing roof. Basically, the roof decking shouldn’t be damaged by water entering the old roof at any pinhole or any additional penetration inside the subject of the roof. This may require a small investigative work prior to installing the new metal roof. It’s highly recommended, to inspect all of roof decking and framing from the attic side of the roof.
metal roof on purlins
One has to look for dark stains, moldy stains, water paths on roof or plywood decking, and or any cracked or split rafters. This should be performed with good care, for one mistake can damage your ceilings or cause substantial harm to oneself. After these things are validated to be okay, then, the next step is to begin preparing the roof. New 1×4 wood strips have to be installed horizontally and vertically every 24 inches across the roof plane on the horizontal from bottom to top. It’s highly advised to use wood screws to attach the newest 1 x 4 wood strips. After this is complete along with a holistic approach to the whole roof, then, it is time to put in the roof panels.
Be mindful that all roof penetrations might need to be flashed with flashing boots which will work together with the metallic panel chosen for the roofing program. Within this step, choosing the metallic panel is vital to the wellbeing of roof lifetime. There are metal panels which float to that would on the surface of the metal that’s simply nothing more than just fancy barn tin. The problem with elaborate barn tin panels is that the rubber dishwashers will dry rust and neglect, thus, developing a roof leak that can undermine all the reason a metallic roof has been chosen to start with.
A straightforward approach to avert the face stained roof material would be to use a concealed fastener metal plank. These types of panels are called standing metal seam. It’s highly recommended when choosing a metal roof to think about longevity. Succinctly expressed, a concealed fastener panel will last the whole life of the alloy with minimal likelihood of leaks other than failing roof penetrations over time.This is ordinary to all roof types.