When the contractor delivered the sad news that my roof needed replacing, that led to a discussion of material choices. I was surprised to hear that metal roofing was an option. Sure, it was fine for commercial buildings, but a home? My contractor told me that metal is used for homes more than people realize. The panels can be designed to look like just about any type of roofing you can imagine. After looking at some samples and finding out about the long life of metal roofs, I decided to give it a try. Fifteen years later, my roof is still in great shape. If you are facing a roof replacement in the near future, let me tell you more about metal roofing. I'm betting that you'll decide this solution is right for your home.
Felt-backed roofing paper was the underlayment of choice for decades, but in the last few years the roofing industry has embraced synthetic underlayment instead. These advanced synthetic materials are self-adhesive for fast installation, waterproof rather than just water resistant, and require no additional fasteners to create potential leak points. However, these products also feature distinct limitations on adhesive strength under high heat conditions. Determine if a self-adhesive roof underlayment will work in your hot climate by considering these four points:
Check the Melting Point
Each synthetic underlayment product is tested to determine its exact heat resistance. Checking the manufacturer's specifications for each product you're considering will determine if you can use it in your area and with your chosen roofing material. Many modern underlayments can resist heat damage up to 260 degrees Fahrenheit, which is still higher than the hottest temperatures you'll usually find on a residential roof. However, a product that is only rated to 180 to 200 degrees of heat resistance may not work under certain types of roofing.
Consider Roofing Materials
The color and material you choose to install over the underlayment plays a large role along with your peak summer temperatures. If it's in the upper 90s outside and your roof is in full sun, a metal roof in a darker color can easily reach 200 degrees or higher. Asphalt shingles tend to retain a little less heat in the summer, but very dark colors can still reach surprisingly high temperatures. Switching to a lighter colored or reflective cool roofing product may make it easier to use the synthetic underlayment you prefer.
Time the Installation
Both heat and cold interfere with a good connection between the adhesive and the roofing surface. The temperatures need to stay well above freezing for the first few days after the underlayment is installed, but excessive heat can cause the adhesive to stay liquid instead of curing. Spring and fall are the best times for installing synthetic underlayment in most areas, but especially in hot climates.
Prepare for Heat Welding
When pairing a self-adhesive underlayment and asphalt shingles in a hot climate, you may experience the roofing materials and underlayment bonding together through heat welding over time. As asphalt and adhesives liquefy due to daily heating cycles, they melt together and make it a little harder to remove the roofing materials for repairs and roof replacement work. However, underlayment is generally removed and replaced during repairs anyways, so it doesn't add too much extra labor cost. For more information, contact companies like SUNVEK.Share