Metal Roofs : Questions and Answers for Homeowners
How can steel roofing prevent damages during earth quake? Is it stronger than concrete? What are the advantages of steel over concrete?
Metal roofing helps prevent damage during an earthquake because it is lighter than other roofing materials, especially concrete. This means as the earth moves while the house tries to remain in place, there is less weight on the roof to react in the opposite direction. The principle is somewhat like centrifugal force whereby the heavier the weight being swung on the end of a rope, the more force that would be exerted on the rope itself. (The actual principle is that of a moment arm with a reduced weight at the end of the moment arm.) Less weight on the roof thus puts less strain on the supporting structural wall system during an earthquake. In addition, steel roofing creates a strong structural membrane across the entire roof that resists both tensile and compressive forces, providing much greater strength for the structural envelope of the house. Concrete is strong in compression but not tension. Steel is stronger, pound for pound, and thus less weight is used for metal roofing. Metal roofing has aesthetic advantages, being able to mimic many other forms of roofing, and enjoys the longest practical service life.
If you have a fire in a building with a metal roof on it. but only part of the roofing is damage. what does the smoke and heat do to the rest of the metal roofing?
It is difficult to answer your question with precision because there would be many variables, including whether the fire actually penetrated the roof membrane to create a superheated "chimney" effect - which would be particularly damaging to the house. Generally, the immediate area of roof damage would obviously require replacement, probably including some conservative, intermediate border area around any actual distorted, discolored, or otherwise damaged roof. Once away from the immediate area of the fire, given no obvious damage, the steel roof should be structurally strong and serviceable. However, one would want to be satisfied that there is no hidden damage to the structural support, wooden sheathing or waterproof membrane (according to the design of the total roofing system) underneath the metal roof.
Steel roof was installed we have a build up of condinsation in side there is an inch and a half of air space with r30 insulation. and fiber glass insulation board also. water runs on the roof trusses y is this happening? id appericate if u could help me with my question. thanks
Unfortunately, there is not enough detail to answer your question satisfactorily, for example, your roof may be a new installation or it may be over an earlier roof. In any event, one would have to conduct a site inspection to determine the true nature of the problem. Your contractor should respond to your question since condensation is not normally a problem in a properly designed and installed system. Your contractor may contact the roofing manufacturer for possible solutions. Many manufacturers require training or certification of the contractors in the application of their product to eliminate such service problems. Perhaps there are some unusual circumstances that were not anticipated in the original work done by your contractor.
I have a reasonable knowledge of building. Can I install a metal roof myself.What specialty tools are required,if any?
Given you meet local building code requirements, including any necessary permits and inspections, it is possible that a skilled individual could install their own metal roof. However, many manufacturers require training or certification of contractors in the application of their product to eliminate service problems. You may not be able to obtain a warranty for the roof without your obtaining the requisite training.
When talking to a roofer he said that you're not supposed to walk on metal roofs, like to clean the gutters, repair the chimney, or put up an antenna. Do you know why he was saying that? For instance, does it damage the texture of shake imitations or the corrosion coating? Are there any mentions of limitations on going up on the roof in the warranties for metal roofs? How do metal roofs compare for soundproofing to shake roofs? How do metal roofs compare for energy efficiency to shake roofs?
Certainly one must be careful about walking on any type of roof because damage can occur, including shake roofs, especially after several years of service. The specific design of the steel roof and its attachment to the support system underneath would be factors. The manufacturer can advise directly concerning warranty requirements. The steel roof would clearly offer a far superior service life to a shake roof. The texture of a metal roof shake imitation and the corrosion coating should not be damaged by suitable footwear and responsible movement. Is this roofer one who normally installs steel roofs who is merely voicing a caution or is he discouraging your consideration of a steel roof? The best answer to your question would come from the manufacturer or his certified, trained contractor. Among other valid considerations for selecting a new roof or replacement roof, would be the cost balanced against the true warranty period. There is no sound detriment to metal roofs versus a shake roof, contrary to the old image of a bare, corrugated roof. Depending upon your local circumstances, you may wish to use an insulating barrier under the roofing for superior performance, according to the manufacturer's recommendations.
How long does a roof last before requiring replacement?
In many cases, a metal roof lasts more than 50 years. An asphalt roof lasts approximately 17 years, depending on your local weather conditions.
Can I put a metal roof over my old asphalt roof?
Yes, in many cases a metal roof can be installed right over your asphalt roof. And since you won't have to tear off your old roof, you save on labor and land fill costs.
What are the maintenance requirements for a steel roof?
It requires minimal maintenance. When the roof is replaced, the steel can be recycled.
Are there many styles of steel roofs to choose from?
Yes. You can select from a variety of styles. If you prefer, you can have a textured appearance as is found in traditional roof coverings, such as shakes, shingles and tile, or you can have traditional straight-line panels. Standing-seam roofs are also popular and are characterized by their linear shadow patterns. All roofs are available in a variety of colors.
I'm concerned about the environment. Is the roofing material recyclable?
You bet it is. Sixty to sixty-five percent of most metal roofing material is recyclable. Asphalt roofing is made of nonrecyclable material.
Is the material fire-retardant?
Steel roofs receive a Class A fire rating, as established by Underwriters Laboratories, Inc. That means it is the most resistant to fire.
What about energy efficiency?
Metal roofs have a high heat reflectivity, which contributes to the overall energy efficiency of your home.
How does the material endure the elements?
Quite well, in fact. Metal roofs withstand all weather conditions, including snow, freeze/thaw cycles, hail damage and high winds. They're also capable of handling heavy snow loads and shed snow easily.
Do steel roofs crack, shrink or erode?
No.
What about noise? Can you hear rainfall on a steel roof?
Metal roofs are quiet, provided that your home has proper insulation.
Is the material lightweight?
Yes, steel roofs are twice as light as traditional roofs.
What is the cost for a roof over a 50-year period?
Though specific costs for materials and installation vary, the long-term cost for a steel roof is less. That's because over a 50-year period, an asphalt roof might require replacement as many as three times.
What about lightning?
Metal roofs are perfectly safe during lightning storms. In fact, since they are non-combustible, steel roofs provide homes with ultimate protection against wind-blown sparks, a common result of lightning or fireplace flues.