Layers of Tar Paper required under a metal roof

Guest User
11/9/2004
How many layers of tar paper are recommended for a metal roof? What is the required thickness for the tar paper? Are the tar paper seams tared? Is insulation required to help hold down heat & noise from a metal roof? I live in a coastal area of FL, what guage of metal roofing is required? What is meant by a 5 "V" metal roof?
Guest User
11/9/2004
5V Crimp is a "generic" name given to a particular profile of corrugated "sheet" roofing. This product has been used a lot on agricultural buildings across the country but on all types of buildings in Florida. Spend some time using this website to explore the types of available metal roofing products. Make sure you find a product which is right for you and for your home. As far as underlayment, requirements will vary from product to product and manufacturer to manufacturer. Always use an underlayment that is suggested by the manufacturer of your roofing. However, one layer of 30-pound felt is common beneath metal roofs. In hot climates, a slip sheet is suggested on top of the felt paper by many manufacturers. A slip sheet is something such as red rosin paper and it prevents the felt and the metal roofing from sticking together. Generally, the underlayment seams are not sealed except perhaps on a lower pitch roof. Again, though, adhere to the roofing manufacturer's instructions. Most metal roofs do not have insulation beneath them. If you were to want to do this, you must make sure that your roofing manufacturer approves of it. I have received virtually no complaints about noise from metal roofs in my 20+ years in this business. As far as heat, metal roofing has many attributes which make it quite energy efficient, especially in lighter colors. However, there are also many manufacturers now using heat reflective paints which are reflective of radiant heat even in darker colors.
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