If your roof is about 20 years old, and the shingles are showing signs of damage, its time to call in a professional for a new roof Charm City Roofing. Combining foam and metal roofing. So much so, that it can even lead to it collapsing entirely. However, can you put a metal roof over shingles furring strips?. (A similar but not identical situation was discussed in your March ’99 On the House column.) I use some of the attic space for storage so when standing up in there I get poked in the head, but also in freezing weather, these nails drip from condensation and get all my stuff wet. Condensation on metal roofs can be a problem once the weather starts to get cold. At Legacy Service, we can help you determine the right one. Condensation on the Metal Roof. Condensation can cause your ceiling to substantially deteriorate over time. Jim has a Masters of Architectural Structures and is a licensed architect. … Two of them are more established companies and have been around for a while. Moisture-Resistant Underlayment. The challenge comes when you combine systems, spraying foam onto the metal roofing itself. He has over 25 years of experience in the roofing industry covering low-slope roof systems, steep-slope roof systems, metal panel roof systems, spray polyurethane foam roof systems, vegetative roof … There is either a layer of an insulating material between the underside of the roofing and the moist air, or the metal roofing will be utilized in an unconditioned building like a barn where the inside and outside air is the generally the same temperature and opportunity for condensation is very minimal. I’ve received 3 different metal roofing quotes and all three of them want to go over the shingles. 1. We have a house built in the 70s with an asphalt roof and would like to install a metal roof. I had a local contractor (he was recommended by a few people I know) come give me a quote. When then environment outside becomes cooler i.e. The underlayment is a weather-resistant material that is installed to prevent water from accumulating in the roofing system. That's no longer true. Essentially, condensation occurs at night, when the temperature inside a building is warmer than outside. Some contractors feel that there is a problem with too much weight causing stress on the roof trusses and that condensation could be an issue. It can lead to roof leaks, even if rain has not occurred for several days. As it cools, it can’t hold as much moisture. What basic questions do I need to ask him about the installation? Roof condensation and water damage can result in expensive, yet preventable repairs and even complete roof replacement. If you are experiencing mold and mildew growth, damp spots on your ceilings and walls, or musty odors, there is a good chance that your metal roof … Metal Roofing: Good Installation and Ventilation Means No Condensation When installed on standard residential construction consisting of typical attic insulation, proper and well-functioning ventilation, and roof decking, metal roofs do not pose a condensation risk. Although damage from condensation isn’t as immediately noticeable as a leaky roof, it can still be severe. Installing metal roofing over shingles is the best solution. Metal roof condensation, especially with a tin roof, can cause serious problems when the metal sweats or rainwater collects under the tin panels.When this happens the tin roof can rust and even warp. The best insulation for a metal roof, whether it’s a standing seam, a corrugated metal roof, or a metal roof over shingles, depends on your preferences. He said he would lay the metal right over my current shingles. First, because many metal buildings are uninsulated, condensation forms more easily in them than in other building types. My insurance has agreed and quoted me a price to replace my shingles. Condensation on the Metal Roof Absolute Steel periodically receives panic calls from homeowners who have experienced roof condensation. A purlin is a wooden or metal horizontal structure that helps to support the roof and the hanger is the metal piece that connects the end of the purlin to the wall or the rafter. Permavent METAL is vapour permeable drainage membrane for all types of standing seam and metal roofs. Surprisingly, it’s a conversation that doesn’t take place enough. This, in turn, prevents moisture condensation on the metal roof. The result is the roof sweating and dripping water all over … A metal roof under the same conditions may stay more than 50°F cooler than an asphalt roof, which saves both energy and money. It will provide a breathable space and prevent the accumulation of condensation underneath the metal roof. A metal roof can be installed over a shingle roof, but you’ll need to make sure the plywood under your shingle roof is in good enough shape to handle a new metal roof over top. Condensation happens when moisture-filled air contacts anything that is below the dew point temperature. I have some doubts about our contractors inthis area. Certain weather conditions may generate condensation on the back of the metal roofing panels. Usually, metal roofs are placed over furring strips for air circulation and to prevent rot. Selecting metal roof and wall panels is a strategic investment for the life of a building. The house and its roof have performed well except for occasional annoying ceiling drips, which occur every winter. The cool metal surface makes water vapor collect on the roof and walls much more readily than in a concrete or wooden structure. It is ideal for roof pitches over 30° and will mask irregularities such as board joins that could deform the metal roof covering. Warm, wet air rises and meets the cold roof and cools. Although all roofing materials can be subject to condensation, a benefit of metal roofing over other materials is that metal doesn’t absorb moisture. After a re-roofing job there are hundreds of nail points sticking out in the attic. Absolute Steel periodically receives panic calls from homeowners who have experienced roof condensation. The metal used for the roof can be tin, copper, aluminum or steel. Although condensation in roofs may not seem like a serious problem, it actually is. Things like condensation, over existing shingles, extension over the roof extension. For many contractors, placing metal roofs on existing shingles furring strips is an ideal way to help the building owners maximize their roof’s durability and save on roof tearing costs. Choosing to install a metal roof this way can save you some dough and garner all of the benefits of a metal roof in the humid climate of Florida! at night, the thin metal in the roof quickly cools down. Ventilation allows that condensation to drain and/or evaporate without reaching your home’s structure. If the tin roof sits on top of another material, such as wood, then you can get a case of wood rot. Fastener application; Apply the same specifications as stated by your manufacturer on your screws when installing the roof. To prevent too much condensation from forming under your metal roof, it’s best to add a vapor barrier underneath. Condensation occurs in roof spaces when there is either too much warm air circulating upwards from living spaces, or when there is inadequate roofing ventilation. Often this is during the fall season when it first begins to get cold and warm air that contains moisture meets up with cooler air resulting in condensation. HI, I recently had storm damage to my shingle roof. Older homes tend to have a degree of natural ventilation due to less accurate building methods, therefore offering more opportunity for moisture to escape. Insulation is an important factor to consider when it comes to installing a metal or shingle roof. That excess moisture ends up as drops of condensation on the roof: Picture a cloud of moisture floating overhead between the rafters. Condensation is a bigger problem in steel buildings for a few reasons. Metal roofing manufacturers typically extend a 25-year warranty. Metal gets cold faster than other items so condensation begins on metal first. Metal Roofs Are Not Just a Novelty . The roof construction is 2x6 T&G planking, two layers of 3-inch rigid foam, … http://www.youtube.com/watch?v=I5WTwZ1U5nM Metal Roofing over shingles..Proper installation of metal roofing system over shingle roof. Despite the many benefits of using the old roofing styles which involve the incorporation of selectively porous and completely permeable membranes, they are the major causes of condensation in roofs. As you can imagine, there are a lot of differing opinions on whether it is permissible to put metal over the top of other roofing materials. Traditionally, condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point. Once, metal roofing was found only on high-end, architect-designed homes. I am almost 100% decided with going to a metal roof. To protect their investment, it is key that your customers ensure the proper ventilation system is installed. Optimal air movement not only promotes temperature regulation and energy efficiency but also reduces the risk of moisture-related issues like condensation build-up. Installing Metal Roof over Shingles Furring Strips. The surest sign of roof condensation is a stain, either on the purlin hangers or on the ceiling. Q: I designed an open-plan house with what I hoped would be an energy-efficient, maintenance-free roof. Metal and Shingle Roof Condensation Solutions. The concern of manufacturer MBCI is over who is going to verify that the foam will not cause corrosive damage over time to the roofing. In terms of performance many homeowners choose a steel roof, making it the most popular option when it comes to creating a metal roof over existing shingles. Metal roof insulation increases the temperature of the inside surface of the ceiling. This is often accomplished using vinyl-backed fiberglass insulation to prevent humid air from coming into contact with the cooler metal roof (which may be at or below the dew point). When the temperature of the roof is lower than the air inside, the extra moisture in the air condenses on the underneath of the roof. 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