There is no doubt that the roof in your home is one of the most important parts of the house. There are several materials that can be used as roofing materials depending on one's taste among factors. Some of the most popular roofing materials include; shingles, roofing tile, metal, slate and wood shakes. It is important to ensure that your roof is well installed by the roof contractor to avoid problems that might cost you a lot of money to solve. Notably, roofs wear out after some time regardless of the material they are made from. Although, it is vital to note that some roofing materials wear out faster than others.
When this happens one can consider doing a roof replacement. This should be done by a qualified roof contractor because it needs the same expertise as the initial instillation done during the house construction process. It is important to note that in most cases one does not have to do roof replacement Portland for the whole roof. It might just be a small part that needs to be taken care of. Doing roof replacement for the whole house might cost more than one expects that is why it is crucial to hire a professional to tell you exactly what needs to be replaced. There are several reasons why people would need roof replacement. Some of those reasons include;
* When an accident like fire, wind or a hurricane occurs one of the areas of the house that is mostly affected is the roof. After things have settled down one should consider roof replacement Portland depending on the extent of the damage and other significant considerations. In some cases, the whole roof might have to be removed and a new one put.
* On average roof replacement should be done at least once every ten years. This is mainly because after ten years one might start feeling the effects of a worn out roof like leaking. This should be taken care of immediately because further negligence will leads to more damage that will cost more to repair. If you are doing home renovation, replacing the roof should be a priority.
* The other reason that drives most homeowners to replace their roof is when they intend to sell the house. A good roof has the ability to improve the price of a house. When potential buyers go for home inspection one of the areas that people give attention to is the roof. This should be done just before you put up the house for sale.
When looking for a contractor to replace your roof you should choose somebody who is qualified. This is because if the job is done haphazardly it might cost you more to get it to look perfect. It is also important to think about how much it will cost you. It should be something within your budget.
Roof Replacement Portland It is important to have information on the replacement of different roofing materials. This comes in handy when your roof needs the services. You can find more information on this from Thesuperiorroofers.com.
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Buying a house has lot of steps and it is very imperative to have whole process of buying property effortlessly. In tricky stages, one is Los Angeles real estate inspection. When buying a house, one has to make sure that one will be getting nice return for made when there is need for sailing it. Best way to ensure it is to call home inspection service for evaluating that home which one wants to purchase and have an exhaustive analysis on health of that home. That analysis will help you to decide amount to offer for that property, infect one shall purchase that property. Los Angeles real estate inspection is most important stage of procedure and one must ensure that he is calling experienced Los Angeles Certified Home Inspector. A reliable home inspector would be able to give correct report of property. To help you in finding a right Los Angeles Home Inspector Service, below mentioned are the advice and queries one should enquire from that home inspector while calling them: Extent of home inspection: Confirm that home inspection would be touching all necessary requirements that house will need to be evaluated. Also thing to make sure is analysis should comply with standard ethics and codes. One may request Los Angeles Home Inspector Service to prepare list of Los Angeles property inspection checklists which will be inspected. In case you think that vital area is left, you may ask Los Angeles Certified Home Inspector to include it. Experience of home inspection service: All always seek reliable home inspector having a formidable track record. If that home inspector can provide list of her past home inspection, you may contact them clients to have their reactions on standard of their home inspection service. Though keep in mind new home inspector as well and lay stress that they should be accompanied with experienced home inspector. Upkeeps by home inspection service: One may ask if home inspection you are going to hire, offer repairs if required on that home which you will be buying. Lot of home inspector do provide repair services too or he would assist you in picking right person for undertaking repairs. Duration for home inspection: When single home inspector will be turning up for home inspection, chances are high that home inspection might take 3 hours for individual family house. Thus it is better to get a team from home inspection service so that Los Angeles property inspection can be done fast. If they need more duration than told above, one may expect a detailed analysis. With above queries you will ensure that you are getting professional home inspector who will do professional home inspection service.
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A man who was hitchhiking across the country for a memoir called "Kindness in America" was shot along a rural highway in northeastern Montana, police there say. Ray Dolin, 39, of West Virginia, approached a pickup truck on Saturday near Glasgow, Mont., thinking the driver was offering him a ride, Valley County Sheriff Glen??
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A new spin on antifreeze Public release date: 11-Jun-2012 [ | E-mail | Share ]
Contact: Michael Patrick Rutter mrutter@seas.harvard.edu 617-496-3815 Harvard University
Researchers create ultra slippery anti-ice and anti-frost surfaces
Cambridge, Mass. June 11, 2012 A team of researchers from Harvard University have invented a way to keep any metal surface free of ice and frost. The treated surfaces quickly shed even tiny, incipient condensation droplets or frost simply through gravity. The technology prevents ice sheets from developing on surfacesand any ice that does form, slides off effortlessly.
The discovery, published online as a just-accepted-manuscript in ACS Nano on June 10, has direct implications for a wide variety of metal surfaces such as those used in refrigeration systems, wind turbines, aircraft, marine vessels, and the construction industry.
The group, led by Joanna Aizenberg, Amy Smith Berylson Professor of Materials Science at the Harvard School of Engineering and Applied Sciences (SEAS) and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard, previously introduced the idea that it was possible to create a surface that completely prevented ice with ice-repellent coatings, inspired by the water repellent lotus leaf. Yet this technique can fail under high humidity as the surface textures become coated with condensation and frost.
"The lack of any practical way to eliminate the intrinsic defects and inhomogeneities that contribute to liquid condensation, pinning, freezing, and strong adhesion, have raised the question of whether any solid surface (irrespective of its topography or treatment) can ever be truly ice-preventive, especially at high-humidity, frost-forming conditions," Aizenberg said.
To combat this problem, the researchers recently invented a radically different technology that is suited for both high humidity and extreme pressure, called SLIPS (Slippery Liquid Infused Porous Surfaces). SLIPS are designed to expose a defect-free, molecularly flat liquid interface, immobilized by a hidden nanostructured solid. On these ultra smooth slippery surfaces fluids and solids alikeincluding water drops, condensation, frost, and even solid icecan slide off easily.
The challenge was to apply this technology to metal surfaces, especially as these materials are ubiquitous in our modern world, from airplane wings to railings. Aizenberg and her team developed a way to coat the metal with a rough material that the lubricant can adhere to. The coating can be finely sculpted to lock in the lubricant and can be applied over a large scale, on arbitrarily shaped metal surfaces. In addition, the coating is non-toxic and anti-corrosive.
To demonstrate the robustness of the technology, the researchers successfully applied it to refrigerator cooling fins and tested it under a prolonged, deep freeze condition. Compared to existing "frost-free" cooling systems, their innovation completely prevented frost far more efficiently and for a longer time.
"Unlike lotus leaf-inspired icephobic surfaces, which fail under high humidity conditions, SLIPS-based icephobic materials, as our results suggest, can completely prevent ice formation at temperatures slightly below 0C while dramatically reducing ice accumulation and adhesion under deep freezing, frost-forming conditions," said Aizenberg.
In addition to allowing for the efficient removal of ice, the technology lowers the energy costs associated by several orders of magnitude. Thus, the readily scalable approach to slippery metallic surfaces holds great promise for broad application in the refrigeration and aviation industry and in other high-humidity environments where an icephobic surface is desirable.
For example, once their technology is applied to a surface, ice on roofs, wires, outdoor signs, and wind turbines could be easily removed merely by tilting, slight agitation, or even wind and vibrations.
"This new approach to icephobic materials is a truly disruptive idea that offers a way to make a transformative impact on energy and safety costs associated with ice, and we are actively working with the refrigeration and aviation industries to bring it to market," said Aizenberg.
Aizenberg is also Professor of Chemistry and Chemical Biology in the Department of Chemistry and Chemical Biology, and Susan S. and Kenneth L. Wallach Professor at the Radcliffe Institute for Advanced Study, and Director of the Kavli Institute for Bionano Science and Technology at Harvard. Her co-authors included Philseok Kim, a Technology Development Fellow at the Wyss Institute and SEAS; Tak-Sing Wong of the Wyss Institute and SEAS; Jack Alvarenga of the Wyss Institute; Michael J. Kreder of the Wyss Institute; and Wilmer E. Adorno-Martinez of University of Puerto Rico.
###
The authors received support from the Materials Research Science and Engineering Center (MRSEC) at Harvard under NSF award #DMR-1005022. Part of this work was performed at the Center for Nanoscale Systems (CNS) at Harvard supported under NSF award #ECS-0335765. In addition, the team acknowledges the Croucher Foundation Postdoctoral Fellowship; the REU BRIDGE, co-funded by the ASSURE program of the DoD in partnership with the NSF REU Site program under NSF Grant #DMR-1005022.
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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
A new spin on antifreeze Public release date: 11-Jun-2012 [ | E-mail | Share ]
Contact: Michael Patrick Rutter mrutter@seas.harvard.edu 617-496-3815 Harvard University
Researchers create ultra slippery anti-ice and anti-frost surfaces
Cambridge, Mass. June 11, 2012 A team of researchers from Harvard University have invented a way to keep any metal surface free of ice and frost. The treated surfaces quickly shed even tiny, incipient condensation droplets or frost simply through gravity. The technology prevents ice sheets from developing on surfacesand any ice that does form, slides off effortlessly.
The discovery, published online as a just-accepted-manuscript in ACS Nano on June 10, has direct implications for a wide variety of metal surfaces such as those used in refrigeration systems, wind turbines, aircraft, marine vessels, and the construction industry.
The group, led by Joanna Aizenberg, Amy Smith Berylson Professor of Materials Science at the Harvard School of Engineering and Applied Sciences (SEAS) and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard, previously introduced the idea that it was possible to create a surface that completely prevented ice with ice-repellent coatings, inspired by the water repellent lotus leaf. Yet this technique can fail under high humidity as the surface textures become coated with condensation and frost.
"The lack of any practical way to eliminate the intrinsic defects and inhomogeneities that contribute to liquid condensation, pinning, freezing, and strong adhesion, have raised the question of whether any solid surface (irrespective of its topography or treatment) can ever be truly ice-preventive, especially at high-humidity, frost-forming conditions," Aizenberg said.
To combat this problem, the researchers recently invented a radically different technology that is suited for both high humidity and extreme pressure, called SLIPS (Slippery Liquid Infused Porous Surfaces). SLIPS are designed to expose a defect-free, molecularly flat liquid interface, immobilized by a hidden nanostructured solid. On these ultra smooth slippery surfaces fluids and solids alikeincluding water drops, condensation, frost, and even solid icecan slide off easily.
The challenge was to apply this technology to metal surfaces, especially as these materials are ubiquitous in our modern world, from airplane wings to railings. Aizenberg and her team developed a way to coat the metal with a rough material that the lubricant can adhere to. The coating can be finely sculpted to lock in the lubricant and can be applied over a large scale, on arbitrarily shaped metal surfaces. In addition, the coating is non-toxic and anti-corrosive.
To demonstrate the robustness of the technology, the researchers successfully applied it to refrigerator cooling fins and tested it under a prolonged, deep freeze condition. Compared to existing "frost-free" cooling systems, their innovation completely prevented frost far more efficiently and for a longer time.
"Unlike lotus leaf-inspired icephobic surfaces, which fail under high humidity conditions, SLIPS-based icephobic materials, as our results suggest, can completely prevent ice formation at temperatures slightly below 0C while dramatically reducing ice accumulation and adhesion under deep freezing, frost-forming conditions," said Aizenberg.
In addition to allowing for the efficient removal of ice, the technology lowers the energy costs associated by several orders of magnitude. Thus, the readily scalable approach to slippery metallic surfaces holds great promise for broad application in the refrigeration and aviation industry and in other high-humidity environments where an icephobic surface is desirable.
For example, once their technology is applied to a surface, ice on roofs, wires, outdoor signs, and wind turbines could be easily removed merely by tilting, slight agitation, or even wind and vibrations.
"This new approach to icephobic materials is a truly disruptive idea that offers a way to make a transformative impact on energy and safety costs associated with ice, and we are actively working with the refrigeration and aviation industries to bring it to market," said Aizenberg.
Aizenberg is also Professor of Chemistry and Chemical Biology in the Department of Chemistry and Chemical Biology, and Susan S. and Kenneth L. Wallach Professor at the Radcliffe Institute for Advanced Study, and Director of the Kavli Institute for Bionano Science and Technology at Harvard. Her co-authors included Philseok Kim, a Technology Development Fellow at the Wyss Institute and SEAS; Tak-Sing Wong of the Wyss Institute and SEAS; Jack Alvarenga of the Wyss Institute; Michael J. Kreder of the Wyss Institute; and Wilmer E. Adorno-Martinez of University of Puerto Rico.
###
The authors received support from the Materials Research Science and Engineering Center (MRSEC) at Harvard under NSF award #DMR-1005022. Part of this work was performed at the Center for Nanoscale Systems (CNS) at Harvard supported under NSF award #ECS-0335765. In addition, the team acknowledges the Croucher Foundation Postdoctoral Fellowship; the REU BRIDGE, co-funded by the ASSURE program of the DoD in partnership with the NSF REU Site program under NSF Grant #DMR-1005022.
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?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
In April, we captured a few snapshots as the space shuttle Enterprise flew around New York City strapped to the top of a 747. Since then, however, the prototype shuttle had been sitting underneath a tent at New York's John F. Kennedy International Airport (I actually saw the Enterprise out the cabin window on a recent flight out of JFK, thanks to a helpful reminder from the captain.)
Now, the shuttle has finally reached its new home. On Wednesday a barge towed the Enterprise up the Hudson River. On Thursday, crews used a crane to hoist the spacecraft off the ship and onto the deck of the Intrepid, a WWII carrier that has be repurposed as the Intrepid Sea, Air & Space Museum and docked on the Hudson River not from PopMech's home base. (In fact, you can see our home, the Hearst Tower?in the background. It's the dark skyscraper on the far right.)
Enterprise did not fly in space; it was the first of the shuttles and acted as a prototype, completing successful test landings in the 1970s in advance of the first shuttle flights to space in the 1980s. If you're in New York right now, you can get a good look at Enterprise for free.
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Public release date: 11-Jun-2012
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