Some jurisdictions may not have regulations that require a building to have an underlayment beneath its metal roof. However, it is advisable for you to insist upon the use of an underlayment for your home's metal roof. This article discusses some of the reasons why this would be a good idea.
Improved Thermal Efficiency
Some metal roofing products have a thermal coating that helps to reflect the heat from the sun. However, the use of such coatings does not keep all the heat out. It is for this reason that you should use an underlayment for your metal roof. That underlayment will help to improve the thermal performance of that roof by shielding the interior of the house from the residual heat that the metal roof absorbs during the day. The underlayment can also improve the retention of heat within your home during the cold months of the year.
Prevention of Water Infiltration
An underlayment also helps to keep water out of the interior of the home during the roof installation process. This is particularly necessary in case the roof is being installed at a time of the year when it rains. The underlayment protects the parts of the home where the roof has not yet been installed. The underlayment can also come in handy when sections of the roof are damaged by a variety of factors, such as hail. The underlayment will prevent water from leaking into the house through the tiny holes in the metal created by extreme weather phenomena, such as hailstorms.
It Provides a Working Surface
An underlayment also serves the added role of providing a reliable work surface upon which the roofers can walk safely as they install the metal roof. The stability of this surface can protect the rest of the building structure from the damage that it would have sustained if a roofer had slipped and fallen from an unstable work surface. The underlayment also provides additional integrity and stability for the entire roof system. This is because the metal roofing material will have a stable surface onto which it will be installed. The roof members, such as the load-bearing steel beams, will also be shielded from temperature variations caused by the changes in the weather.
A strong roofing system results from the proper integration of all the components of that roofing system. A roof underlayment is one of the roofing system components that you should not avoid. Ask a roofer to advise you on what underlayment would be the best for your metal roof.