Metal Roof Rafter Span Tables – If this is so, then you are going to find there are many alternatives out there in the roofing market. These options can range from multiple variations of asphalt shingle kinds to a lot of variations of alloy panels. One of the numerous questions which are presented to an expert contractor is ” can metal roofing be set up over shingles?” . The dichotomous nature of installing metal within an present shingle roof requires many steps. We will analyze these steps in greater detail to help determine if retrofitting a metal roof over an present asphalt shingle roof is an innovative idea.
flat roof truss spacing
There are several things you must consider before choosing to install a metal panel roof over an present asphalt shingle roof. The first thing that must be determined is if the roof plywood or plank board decking is secure and solid beneath the existing roof. Basically, the roof tiling should not be damaged by water entering the old roof in any pinhole or some additional penetration inside the subject of the roof. This may require a little investigative work before installing the new metal roof. It’s highly recommended, to inspect all roof decking and framing out of the attic side of the roof.
flat roof truss spacing
One must search for dark spots, moldy spots, water trails on plywood or roof tiling, and or some cracked or split rafters. This should be done with good care, for one error can harm your ceilings or cause substantial injury to oneself. Following these things are validated to be okay, then, the next step is to start preparing the roof. New 1×4 timber strips have to be installed vertically and horizontally every 24 inches across the roof plane on the flat from bottom to top. It’s highly advised to use wood screws to attach the newest 1 x 4 timber strips. Following this is complete and a holistic approach to the whole roof, then, it is time to install the roofing panels.
Be mindful that all roof penetrations will need to be flashed with flashing boots which will work together with the metal panel selected for the roofing program. In this step, choosing the metal panel is vital to the longevity of roof lifetime. You will find metal panels which float to that would on the face of the metal that is 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, creating a roof leak that may undermine all the reason a metal roof has been selected to start with.
An easy approach to avoid the face stained roof stuff is to use a concealed fastener metal panel. These kinds of panels are known as standing metal seam. It’s highly recommended when choosing a metal roof to consider longevity. Succinctly expressed, a concealed fastener panel will last the whole life of the alloy with minimal chance of leaks aside from failing roof penetrations over time.This is normal to all roof types.