Weather Proofing Aluminum Windows and Doors

Due to an extreme decline in the house market with mortgage rates hitting an all-time low, more people are opting to maintain their old homes rather than move in to newer and more modern homes. As a result, such individuals are expected to pay more attention their house maintenance and upkeep. To this regard, one of the most vital aspects is weather proofing as it helps one lower their energy bills.

Weather Proofing Aluminum Windows and Doors

The best place to begin your weather proofing exercise is by working on the windows and doors. In order to adequately ensure weather conditions remain constant in your house regardless of the season, the first thing you should do is check around the aluminum doors and aluminum windows for crumbly caulk. In case one finds some peeling or chipping around the aluminum doors and aluminum windows, it is important they are replaced. Fortunately, the process of replacing caulk is rather easy. Even the most basic handymen can manage this task. The caulk should be evenly distributed across the aluminum windows so as to ensure to space is left uncatered to.

Another vital step is checking the weatherstripping. This basically refers to the flexible material that is placed around aluminum windows and aluminum doors. It is typically made up of vinyl, although some manufacturers prefer to use plastic, foam, various metal cases, and cork. For aluminum doors and especially folding or aluminum sliding doors, the doors need to be opened first for the vinyl to be replaced. This is because the weatherstripping material is concealed underneath the aluminum sliding door whenever it is closed. It is the same case for casement style windows.

In some cases, it would be advisable to add plastic sheeting to all windows so as to reduce heat loss during cold seasons. This should be done in lieu of installing storm doors and windows. Aluminum sliding doors should also have this plastic sheeting due to the fact that they have a larger surface area exposed. Regardless of your aluminum sliding door size, adding this plastic sheet is highly advisable since they are inexpensive and very easy to install. Lastly, check all your outlets for drafts since they are very common especially in old houses.

5 Tips for Energy Efficient Windows and Doors

For typical home owners, making an energy efficient plan for your home would prove to be a rather challenging task. However, it is a definitely worth the effort. By doing this, not only will it help keep energy reduction costs at a minimum, but also aid in lowering one’s carbon footprint which is very good for the surrounding. One of the best ways through which one can achieve this is by using their aluminium doors and aluminium windows as instruments of energy efficiency. Below are some tips on how this can be achieved.

Energy Efficient Windows and Doors

  • How one positions their aluminium doors and aluminium windows matters a lot when it comes to energy efficiency. Whether you are using aluminium sliding doors or folding doors, both doors and windows should be placed in a position where they tend to make the most of natural light. Basically, this would require you to put most of the aluminium doors and aluminium windows to the south of the house. The same applies to the entry points whether your use aluminium sliding doors or not.
  • However, if you are forced to position most of them towards the north, then it would be advisable to install solar screens. Alternatively, one could decide to use windows with ultraviolet ray’s filters for their aluminium windows and aluminium doors. The same should be done for all aluminium sliding doors given the fact that they have a larger surface area through which harmful rays could access your living space. These filters help disseminate any form of direct sunlight.
  • Insulation is also a major factor to consider when it comes to your home’s energy efficiency levels. Ensure that all walls are heavily insulated as well as the attic. This will go a long way in reducing your cooling and heating expenses.
  • Makes sure to install energy saving windows in your house. There is quite a variety available in the market today. You can in fact decide to use such even on your aluminium sliding doors. They are affordable and highly efficient.
  • Lastly, make sure to use aluminium as much as possible in the windows and doors. It is a very good cooling material and this will help in ensuring your house is energy efficient.

Shopping for Doors

aluminium doors, glass door, aluminium patio doors

Whenever one goes shopping for new doors, be it plain aluminium doors, aluminium sliding doors, or aluminium folding doors, they should ensure that they go for the most  durable, functional, secure, and good looking option. Moreover, they should also pick one that offers a favorable insulation setting with specific regards to the living space in which the doors are to be installed. So as to ensure that all these factors are appropriately considered, below are some aspects that one should have in mind before making a buy.

  1. Unlike in the past, external doors aimed at helping individuals gain access to balconies or gardens are no longer restricted to aluminium sliding doors, aluminium folding doors, or double doors. It is very possible for one to use plain aluminium doors for this purpose.
  2. Traditionally, French doors were strictly made out of wood. However, with the recent trends, such doors are today available in a variety of options. The most common options include aluminium and PVC-u. As such, it is possible to buy French aluminium sliding doors, French aluminium folding doors, or plain French aluminium doors. Additionally, it is also important to vote that the kind of doors can open outwards or inwards. Therefore, it is important to consider this depending on the pace one plans to install the door.
  3. It has been realized that he sliding method often leads to various operational difficulties. As a result, it would be advisable to avoid aluminium sliding doors or any other kind of sliding doors if possible. There are several options in the form of aluminium folding doors, rolling doors, or even the usual aluminium door. Rolling patio doors are by far the most convenient option given the fact that they use a series of co-joined rollers to smoothly glide open.
  4. Lastly, one should seriously consider going for wide doors since they do not restrict access in or out. With most patio doors comprising of two or more huge PVC-u glass panes or in some cases aluminium frames, at least half of the passage experiences restricted access. This makes wide doors a very viable option.

Choosing a Patio Door

Home owners have to basic choices when it comes to purchasing patio doors. One can either go for aluminium doors or wooden. Just as is the case with wooden, aluminium doors offer sleekness, long-lasting beauty, and sleek designs. In addition to this, they are easy to maintain and offer good insulation.

Popular Patio Door Material

Wooden doors are made from various types of hard timber material. The reason behind the use of hardwood is so as to ensure that the outer frame remain strong enough to hold up well against any sort of mishap, dent, or scratches. This helps ensure that the door is durable. It is an important factor to consider since patio doors help link the outside to the inside. Given the fact that this is by far one of the busiest doors in any homestead, it is of importance that one ensures the door is strong enough to survive through the high level of activity. Moreover, wooden doors are more energy efficient than aluminium doors. This makes them more suitable for homes located in colder regions where it’s extremely cold. Aluminium doors would not be a very prudent idea for such homes since they tend to let a lot of heat out. Therefore, aluminium patio doors are better off used in areas with moderatet to extreme heat conditions due to their cooling effect. All in all, aluminium doors also have numerous benefits in that they are easy to maintain and do not rust. They offer homeowners years of aesthetic value without heavy maintenance requirements.

Style & Durability of Patio Doors

Another factor worth considering when it comes to patio doors is the style of door. There a number of varying styles including French, out swing, aluminium sliding doors, and aluminium folding doors. This decision tends to vary depending on the home design. One advantage of using more contemporary doors such as aluminium sliding doors or aluminium folding doors is the style they offer.  Both give the house a more elegant look than the traditional kind of door. However, it is important to note that the aluminium folding doors and aluminium sliding doors tend to use a rather hectic mechanism for their operations. The aluminium sliding doors for example rely on a set of rollers placed at the bottom in order to slide effectively. Chances are there will be mechanical issues somewhere along the way. Same is the case for aluminium folding doors. Therefore, it is advisable to pick an option that is easily maintained and one that is not prone to mechanical breakdown.

Top 10 best uses for aluminium


Aluminium has many applications in a variety of different domains, including:

Aluminium is an element that is very widely used in the world today. Its appearance is silvery white, and it has many unusual properties. There is no other metal that has ever been used in so many different ways such as aluminium. Its unique properties enable it to be applied in different ways, including in the construction of aluminium doors.

Uses of aluminium

  1. Building and construction is the area where aluminium is used most. It can be applied in the creation of domes, roofs, bridges and different structures. Stairways, landings, cladding and so on are made from aluminium. Its malleable nature makes it the best option for aluminium, windows, aluminium doors, window frames, grills, doorknobs, and more. Aluminium sliding doors and aluminium folding doors are also very popular. Commercial buildings also use aluminium in different areas.
  2. Packaging, including beverages, foods, pharmaceuticals and so on. Toasters, fridges, kettles, utensils, thermoses, bottles, and cans are made using the element. It keeps the food safe and does not affect food smell or taste.
  3. Modes of transportation like buses, boats, ships, trains, and aircraft use the element to make them strong and weightless. The electrical systems, wiring, exteriors, and frames of airplanes also use aluminium.
  4. In the automobile industry, the metal is used in the manufacturing of cars.
  5. Electrical materials and power lines use a percentage of aluminium to transmit high voltages.
  6. It is used to make heat reflectors and mirrors.
  7. Consumer products such as bicycles, containers, gas cylinders, and household fittings are made of aluminium.
  8. It is used in making marine equipment.
  9. The sports world uses it for watches, golf clubs, tennis racquets, and baseball bats.
  10. The entertainment industry uses it to make CDs and electronic equipment.

One other notable area that is worth mentioning is that many compounds and salts of aluminium are used in the manufacturing of gemstones, paints, paper, ceramics, and glass. There are also places where coins are made of aluminium.


Double Glazed Panes

In order to understand this area, the section has been broken down into a sequence of subtopics. Each and every of these have been aimed at explaining what double glazing actually is and what are the considerations when you may want to invest in double glazing.


With time, you will notice that all properties tend to loose heat via their windows – be it the library, home or even commercial buildings. As such, the use of double glazing is but a way of making sure that you are able to reduce or cut down on your overall heat costs. This way, you will be able to avert some additional costs such as having to install a new heating appliance for your home should you find yourself in the unfortunate situation where you are frequently loosing heat from within your abode.


From the term double glazing, you clearly envision some sort of an overlay between two sheets of glass so as to be able to achieve the double glazing property. It is this property which in effect generates the insulating property. Many a times you may also encounter the likes of triple – glazed windows which are way more efficient than the double glazed windows – though both of these deliver almost the same kind of energy efficiency on the long haul.


Usually, in between the double glazed material, you will realize that this space may be filled with some inert gas or a vacuum. So, which is which and which one should you prefer more to the other?

  • Though they were once the best option, these have deprecated with time owing to the fact that with the vacuum seals, the vacuum may diminish with time and so does the efficiency, since there may be no efficient sealing.
    This is the other and most reliable method since the inert gases are but a docile and unresponsive to adverse heat conditions. This way, they don’t suffer from the “unsealing” effect of the vacuum seen above.

Either way, both of these methods have proven important as they both try to add onto the overall scientific R-value which is simply a measure of the internal thermal resistance.


Usually, these are available in a variety of frame materials, ranging from the traditional wood frames to the more decent frames such as the uPVC styles. Usually, these windows do vary in their energy efficiency based on how well they actually stop heat from passing out from the room. Moreover, the specific type of frame material is what will determine the amount of sunlight which actually passes through the glass and how little air can leak in or out around the window.


Usually, some window manufacturers and door makers use the window rating energy efficiency rating scheme to depict the efficiency of their windows. If this is not clear, you may relate this to the energy efficiency which you see on your refrigerators as well as the washing machines. Usually, A-rated windows are considered most efficient, with all the captivating qualities – which you may simply find on the energy label before you actually buy the window.


So, following the brief introduction about double glazing, you have to consider a number of factors before you actually decide to settle with double glazing.


This is usually very easy as all you need to do is simply look on the windows energy saving efficiency. This you may do by taking a look on the Energy Saving Recommended Trust and the British Fenestration Rating Council energy label. Usually, the Energy Saving Trust is known to endorse any window which has been rated B or above. Usually, the energy efficiency is directly proportional to the efficiency – the higher the energy efficiency rating, then the better the window will be. Irrespective of the fact that there are no current mandatory regulations for a window to have some quality branding, it is best to go for windows which have a quality branding. This you may easily find on the BFRC website very easily.


Usually, double glazing is but two layers of glass which are separated with a gap of around 16mm. at times, you may decide to go with three layers of glass as per your budget. Nevertheless, these usually deliver one and the same energy efficiency, but the triple glazed option is much better than the double glazed variation.


Usually, when it comes to energy efficiency, the most preferred option is the Low-E glass. This simply means a low emissivity glass. What does this glass have that makes it way better at energy efficiency? Well, this glass has an unnoticeable layer of metal oxide on its surface, usually on one of the internal surfaces – commonly next to the gap. What this does is that it lets in sunlight but actually cuts the amount of heat which can get out once it enters.


Usually, two types of materials may be used for this purpose: a vacuum or inert gasses. However, for utmost efficiency, then the best option to go with is the use of inert gasses. The gasses to be used here include argon, xenon and mostly krypton.


Usually, most of the double-glazed windows have what are referred to as the pane spacers which simply are located inside the glass to keep the two glasses apart from one another. Usually, it is best to opt for the warm edge types of pace spacers. What these are is simply little or no metal spacers at all. Usually, from the BFRC, you will be able to know the best type of spacer, since you may take a look at the rating of the material, say from A-G, with A being the best as usual.


Since for all the window frames out there, you will find that each is tailored to enhance energy efficiency in one way or another, the actual or final option will dwell on your taste or preference. For that matter, take this as an example:

  • These are some of the most common types of frames and they are long lasting as well as easy to recycle.
  • Wooden frames.
    These can to some extent have a lower environmental impact, though they actually require a lot of maintenance. Usually, these are used in conservation areas where the initial or original windows were timber frames.
  • Composite frames.
    You may envision these as clad frames as well, since they simply contain an alloy of aluminum and timber. Aluminum is used to cover timber which is on the inside in the final product. Usually, this does reduce the need for maintenance and keep the overall material waterproof.
  • Steel or aluminum frames.
    These are way slimmer and perchance long lasting than the other types of frames.


Since the replacement or initial installation of double glazed windows tends to be more airtight than single glazed frames, condensation can actually build up in your house due to the reduced ventilation. If there is no enough level of background ventilation, then some of the replacement windows will actually have a trickle effect on the vents incorporated into the frame which lets in a small amount of controlled ventilation. Usually, at times, condensation can actually occur on the outside of lower E glazing windows. This is the case since low-e glass actually reflects heat back into the home, and hence the outside pane remains cool, making the condensation to build up on the long run.


    When you decide to use the energy efficient double glazing materials, you will realize that you will be able to save on the overall bill you would encounter on your internal room heating by about $200.
    By adopting the use of energy efficient double glazing mechanisms, you will be able to be a part of environment friendliness, by lowering the amount of carbon level on the environment and hence lower global warming.
    Usually, energy efficient glazing does reduce heat loss through windows and results to fewer draughts or cold spots in your home.
    Usually, energy conservative windows and window frames play a part in acting as noise insulators. As such, you will be able to have a peaceful and serene internal environment.
    Usually, energy efficient glazing tends to reduce the overall condensation build-up on the inside of the windows.


Despite the fact that a typical man in the street may see no difference between the grocery glass and a house glass, there exist some difference between these two kinds of glasses. Case in point, you may think that a table glass is one and the same with a typical wine glass or a window glass – until you test their fragility. For one, you will learn that the break point is utterly different, be it using heat, pressure or force. So, what this means is that there are different types of glass, each of which happens to have different break points. So, with that, what are some of the various types of glass?


This is used primarily in windows. Moreover, you may find this also in mirrors, room dividers and at times in some household furniture. Usually, most of the flat is made in the form of flat sheets. Nonetheless, you may at times find that some of these may be made via a more sophisticated mechanism, the likes of automobile windshields which have to be reheated then curved over molds. This gives a totally different appearance as well as texture from a primary household window.


These are usually used in packaging food. They may be used in other functions like packaging medicine, cosmetics or even chemicals. Usually, these are actually made in a wide variety of shapes, sizes and colors, making them all the more distinct and variant from other glass types. Moreover, you may find these being used in other common uses like as drinking bottles. In some extreme cases, you will realize that some are made from expert chemical formulae to make sure that these are free of any contamination or deterioration of blood plasma and other chemicals which may be stored on them.


This is used in high level applications such as optical lenses, eyeglasses, telescopes and other types of laboratory equipment’s. In such a case, the raw material has to be at all times pure so that the glass which will result from the process will be utterly flawless on the long run. Thus, this usually makes making these glasses more expensive, since the overall care required is highly demanding.


Usually, this consists of fine but solid rods of glass, most of which are nothing more than a twentieth of the width of the human hair. Moreover, fiberglass may be packed to assume some sort of a wool like appearance which can serve a great role as a heat insulator. Moreover, these find themselves useful in other applications such as wool or cotton fiber in the construction of mats or glass yarn. Other real life applications are the construction of firefighter suits, owing to their insulating factor. Moreover, it may be used as a curtain material since it is very easy to clean as well as being fire-resistant.


These are simple made as some sort of a sandwich. What this means is that they are made from a combination of alternate layers of flat glass and plastic. So, how is this important? Usually the outer layer of the glass may easily break when struck but the elastic plastic layer can also be able to stretch on its own. So, the plastic will be serving the role of holding the broken pieces together – a good example being in automobile windshields where the flying glass particles may cause considerable damage in the event of an accident.


Basically, this is none other than a highly and thick multilayer laminated glass. Unequivocally, this is able to stop even high caliber bullet at close range. Usually, the glass itself is heavy enough to absorb the energy of the bullet, while the plastic serves the role of holding the pieces onto one another. Good applications of this type of glass is in banks teller windows as well as in military vehicles such as tanks and other special automobiles.


Opposed to the laminated glass, this specific type has been given a considerable amount of special heat treatment. Despite the fact that it may look, weigh and feel the same as ordinary glass, it actually happens to be several times heavier than normal glass. Most of the applications of this type of glass in in the all-glass doors and rear windows of automobiles. Usually, this is way hard to break, even when hit with something like a mattock or hammer – but collapses into thousands of small particles if it breaks.


This is usually a heavy plate glass which may be available in a number of colors. In buildings, it may be used as an interior facing but may also be used for interior walls or as tabletops.


This is the kind of glass which will actually appear milky. Usually, this is made possible by the presence of small particles which are contained within the glass, dispersing light and hence making it possible to disperse the light. Usually, there are a number of ingredients which will be needed to produce opal glass and these include fluorides. Usually, you may find this more often in tableware and at times in lighting fixtures.


In appearance, when this is cut, it appears as some sort of a honeycomb. Within it, there are numerous cells of gas. Then again, each and every cell is actually separated from the other cells using a thin wall of glass. Another appealing feature of this glass is that it is so light to the point that it actually floats on water. The most common application of this glass is in buildings and on chemical equipment. Moreover, foam saw may easily be cut into various shapes using a saw easily.


Usually, these are made of two hollow half-sections which are sealed together at high temperatures. Usually, you will find these to be most useful since the dead space within them. Usually, the blocks are laid like bricks so as to make walls as well as other types of structures.


Usually, this is rich in silica and does contain traces of boric oxide. Owing to the fact that this does expand little when heated, it can actually withstand higher temperatures when heated and hence not crack easily. This thus makes it necessary in cookware and other household equipment as well as many types of industrial gear equipment where the likes of furnaces are more prominent.


These actually include breakers, flasks as well as other types of special laboratory equipment. This si also made from heat resistant glass so as to be able to endure extreme and rapid temperature changes – heat shock. Moreover, this is resistant to corrosion and other forms of chemical attacks than normal glass.


Since glass has features such as useful heat resistance and resistance to flow of electricity, it is ideal for use in electrical applications. Moreover, glass can easily be used to seal tightly onto metals without breaking – electric light bulbs are good examples. As such, from these qualities, glass is the ideal for other electrical applications such as even in picture tubes in television sets.


These are the current networking option for the transmission of information in the form of electric pulses. For instance, thin and pure optic fibers will be used to carry TV signals over long distances. Moreover, these are also used in control board displays and other medical instruments.


This is what you see in the neon lights and other types of lights around you every day. The best examples where glass tubing may be made include fluorescent lights and neon lights among other application.


These are nothing but strong materials which are made by heating glass to simply rearrange the atoms into regular patterns. Usually, the resultant partially crystalline materials are able to withstand high temperatures, abrupt temperature changes and adverse chemical attacks much better than ordinary glass. Thus, this makes them most suitable in the likes of turbine engines and nose cones of guided missiles.


Normally, these glasses can be able to transmit, modify or block radiant heat energies such as x-rays. Case in point, ultraviolet glass does absorb ultraviolet rays of the sun, but transmits visible light. Another good example is the use of polarized glass to help in cutting the glare of brilliant light. Nonetheless, there is a special manner in which glass can be coated so that an observer from the interior of a house can actually see those outside without being seen.


This is but a special type of glass which makes it possible to generate laser beams efficiently. Usually, such glass is used more as an important active additive in solid-state lasers – lasers which actually send light out through crystal or glass. Moreover, you have to know that there has been an increase in the use of this set of windows specifically. A good example of the application is when powerful glass lasers heat hydrogen atoms till hydrogen nuclei actually fuse, releasing quantifiable amounts of energy.


Usually, this is used for coated camera and eyeglasses, the coating is simply a small coating which decreases the normal light loss via reflection. As such, more and more light passes through, leading to the formation of way better images.



Many a time when you plan on considering a window replacement or even a first time window installation, there are a number of things which you have to bear in mind about windows. These have been summarized here in terms of some of the most commonly frequently asked questions.


The term basically stands for low emissivity. This is the quality of window which makes it possible for light to freely pass through the window – any glass material. So, what is low-E? This is simply a coating of non-visible and microscopic layer of silver which have been sandwiched in between layers of antireflective metal oxide. Usually, when these are added onto the surface of windows, they end up providing increased comfort and protection from harmful UV rays. Usually, this feature helps achieve this goal by actually filtering out the harmful part of light spectrum which contains the harmful UV rays.


Usually, the time span for window replacement is at most 25 years. This is to be able to earn the ultimate energy efficiency and at the same time be able to protect your home, should you have very old, unreliable and weak window frames. Case in point, if your windows are all painted shut, experience a lot of ice buildup or sealed, then it is about time that you consider replacing your windows.


These two are some of the most important things to consider when you wish to have an energy efficient window. Case in point, the U-value is what will represent the amount of heat which actually escapes out through the window while the R-value simply represents the ability of a window to conserve more, how do these actually achieve efficiency? Well, to begin, the lower the U-value then the more energy efficient a window actually is while the higher the R-value of a window then the more energy efficient the window is. These two are somewhat compliments of one another and thus, you should consider weighing on these two for you to get the desired quality.


The main reason as to why it is paramount to envision the building process as being a vital step in the energy efficiency process is the fact that the design of buildings is one of the main reasons which determine the energy efficiency in buildings. Moreover, it is paramount to appreciate the unavoidable fact that even the best thermal efficiency materials may be ruined if not correctly installed. This is why it is important that the builder as well as the owner have to understand the intentions of the designer who will be doing the overall work so as to achieve energy efficiency on the long run. As such, the designer has an overall co-responsibility, owing to the fact that the designer is the actual “painter” of the resultant establishment.


Basically, in order to be able to deliver the best insulation qualities, then it is best that one gets to comprehend what the overall process is all about. With this, it will be possible to realize the best and cost-effective approaches to ensuring optimality when it comes to energy efficiency. Usually, it is best to take the baby steps into what insulation is all about. Insulation is basically trying to reduce heat loss by the constructed establishments. This will be noted mostly when two different zone areas are close to one another. Case in point, during the winter, the outside is way cooler than the inside of the house and hence this will lead to continuous heat transfer. The contrary happens during the summer. As such, insulation is aimed at trying to moderate this, if not eliminate it completely.


Draught proofing somewhat aims at preventing the inside air from leaving the building while at the same time preventing the inside air from leaving the building. Usually, the former happens during the summer season where the outside temperature is way warmer than the inside temperature. The opposite happens during winter season, where air leaves the building into the outside. So, with draught proofing¸ there is aim at making sure that this transfer or air from the inside to the outside and the vice versa is controlled somehow. So, when this is taken into account it will be helpful in supporting the insulation, heating and thermal mass factors.


Usually, different parts of a building would require different attention when installation is to be taken into account. Case in point, flat ceilings with pitched roofs are the easiest ones to insulate. In such a case, it would be best to use reflective foil materials on top of the rafters however below the battens of the tiles on the roof, with a minimum overlap of about 150mm. However, with bulk insulation, this is a bit different because this should be done to allow batts and blankets to be able to expand their natural thickness, cut clearly to fit in between the ceiling joints – keeping in mind that they have to be kept clear of recessed light fittings of any sort. On the other hand, blow in insulations have to be applied such that they don’t interfere with the breezes present within the ceiling spaces.


There are a number of things which you should consider when buying your insulation, these are:

  • Reading the product label. It is here that you will find important information such as the manufacture’s name, the R – Value of the material, batch ID number among other important checks which you have to consider, if you are to get the best insulation material on the long run.
  • Consider fire safety. Basically, all the insulation materials have to be in line with the National Building Regulations, meaning that these have to be tested and verified independently. During this test, there should also be fire testing which will be covered in the SANS 428 specification. Thus, it should have recommended fire performance prior to being put out into the market.
  • Consider multiple quotes at all times. This will basically help when there is need for cross referencing. Check multiple reports for the correct analysis and observation of the sets, which means that as long as these are above the accepted code, then the overall set will be the one you are looking for.
  • Give the R – Value some weight. Basically, the R – Value is what will determine the ability of an establishment to be able to retain the heat within. The greater the value then the more efficient the material will be and the vice versa.