In many instances, installing a new roof with a Roof Hugger will not only give the owner a new watertight roof, but a structural upgrade at the same time. There are a lot of buildings out there that will not meet the current design loads or are at the limit as they are. Basically, we made the existing 8” purlin into a 12 1/2” purlin. Hat over zee clip system over low floating 3 x 24 trapezoidal standing seam.Īs I said in the first article, we saw an increase over 7 pounds per square foot of added capacity by using a 4 1/2” Roof Hugger on top of an R panel. ![]() Roof Hugger has conducted a lot of modified base testing that includes a purlin lap as well as software modeling to determine exactly how much extra load the purlins will handle after installation of the Roof Hugger. A Roof Hugger installed over an exposed-fastener roof on a metal building will increase the load carrying capacity of the purlin. First, it provides the most attachment back to the structure of any frame system used to recover an open-frame metal building. There are a number of reasons I think it is the best system. A Roof Hugger is a 16- or 14-gauge purlin that is notched out to fit over the ribs of the existing roof on a metal building. In my opinion, the best way to recover an existing roof on a metal building is to use a Roof Hugger. ![]() Let’s start with options to recover an existing exposed fastener roof. Pretty much all of these methods will weigh less than 3 pounds per square foot, unless you add a lot of iso or get involved in a grid system. As stated before, the Section 707 of the International Existing Building Code allows for the recover over an existing roof as long as it does not add more than 3 pounds per square foot to the structure. If you or the owner are concerned about the additional weight added during reroofing, then you will need to measure purlin gauge, size, lap length over the rafter frames, bay spacing and how the purlins are attached to the rafter frames. You will need to have some kind of drawing showing roof plan and elevation. In order to calculate those pressures, you need the purlin spacing, the roof slope and the eave height. The roof system you plan to use to recover the existing roof will need to meet the current wind and snow loads attached to the existing frame spacing. This should be one of the first things you figure out because it will determine how you retrofit the roof. ![]() First you need to determine: What is the existing roof? Is it an exposed fastener R panel or Corrugated panel, or is it a standing seam? If it is a standing seam you need to know if it is installed with high floating or low floating clips. On a metal building, there are several things that need to be established to help decide what is the best way to recover the roof. These include Roof Hugger, Top Hat, Clip and Purlin, Zee Clip and Hat, Hat over hat spacer, hat over sliding hat, hat and scat, Grid, tall clip and infill with rigid insulation (where you attach the new roof to the purlins using long fasteners). There are at least nine ways to recover an existing metal roof on a metal building.
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