31 Jul

Double Glazing Explained and the Benefits

Double glazing is more regularly than not the very first option to consider for enhancing the power performance of windows within an older building. As windows tend to be a foremost supply of oxygen infiltration draught-prevention applying seals is among the best methods for improving convenience and limiting energy-use, with little if any change to some buildings take a look at minimal price.

However, secondary glazing can provide you a significantly greater thermal efficiency than draught-prevention alone. It might even be selected where adding draught-prevention seals towards the windows is particularly challenging.

Likewise, several steel-framed windows have spaces which are too large to seal.

Windows with leaded lights might permit air infiltration round the guide which may be resolved using the aid of secondary glazing.

Based upon the buildings use, area and also the residents’ convenience needs additional benefits and advantages of secondary glazing, for example noise reduction, might have a bearing about the style and design answer.

If extra glazing may be the chosen answer, then your external windows are better left without draught-prevention to ensure that there surely is some ventilation towards the air-space separating the external windows and also the extra glazing to prevent the develop of condensation.

Lead Paint

Guide offers could be bad for health, particularly children.

Lead-based paints tend to be available on older buildings. Often these offers have now been over-coloured. When there is any doubt concerning the lifetime of lead paint on windows which are likely to be removed, it should be thought that lead paint exists and precautions taken accordingly.

Using lead offers currently has been usually barred as a result of the risk to health. That said, there’s an exemption towards the bar that allows them to become utilized on Quality I and Quality II* listed properties. On these buildings the standard look of the lead paint, as well as its endurance and its own fungicidal and insecticidal qualities, imply that it’s frequently still employed. It will just be reproduced by competent designers using correct protective gear, which is not recommended to be used where it might be within the reach of children.

The advantages of secondary glazing

Even though primary reason for secondary glazing products in older structures would be to enhance the thermal capacity for windows by draught-prevention in addition to lowering the passing of warmth through glass, secondary glazing can offer numerous additional benefits.

Thermal Benefits

Temperature damage from the space using a screen within the heat weeks are complicated as three main components have been in play:

*by convection and passing, in the warmer area air-to the cooler of the glass and the body

*by the cold floor of the screen taking in infra-red light in the space

*by uncontrolled air leakage, which could also generate cold-air in the exterior areas or consider heated air out of the inside; known as oxygen infiltration, this could happen even if the screen is closed.

Heat loss through the glass and structures

It generally does not matter if it leaves the area by convection, conduction or light, the missing warmth all experiences the glass as well as the body as passing. The glass is basically one of the most conductive part of the screen but warmth is usually dropped over the body though in a reduced price.

Simple glazing is just a bad power insulator and easily conducts heat. An average 4mm thick glass includes an archetypal u value of 5.4W/m2K. The thermal reduction via a single-glazed screen is determined by the entire section of glass, the conductance of the body content and also the quality of installing the body and double glazing products. An average price of the wood framed single-glazed screen is 4.8W/m2K.

For thermal efficiency, the ideal airspace between panes is-16 – 20mm. A much better air-space allows convection currents to build up inside the emptiness and much more warmth to become shed. The placement of the extra device is usually based on the screen expose and certainly will usually just be installed far away around 100mm in the primary glazing. With that said, a substantial percentage of the thermal advantage of secondary glazing originates from decoupling the body in the primary wooden window-frame which may decrease the u value to roughly 2.5W/m2K.

The usage of low-emissivity glass for that extra glazing may further enhance the thermal performance to significantly less than 2.0/m2K. To keep this amount, it’s very important to maintain the conclusion clean – the conventional is ‘successfully’ clear.

Heat loss through air leakage

Temperature losses from the common traditional window are mainly through breaks round the screen. With larger windows the percentage of warmth drop by passing through the glass is commonly bigger. Because draughts, due to convection and air infiltration make people experience less comfortable, the folks within the space might arrive the heat, as well as run it for longer.

Bespoke secondary windows, with effective border sealing and wash or pressure seals about the beginning sections, produce a fruitful seal within the total of the mainframe of the primary screen and certainly will considerably moderate excessive draughts.

Just before starting on the procedure for draught-prevention, look at a fan pressurisation evaluation to discover the specific resources of oxygen transmission and decide which windows need interest because they may compare considerably within the quantity of draughts they let in.

Quantifying Draughtiness

The draughtiness of the building will be based upon the quantity of atmosphere that may go through its outside cover – surfaces, ground and roof covering. That is referred to whilst the oxygen permeability. The standard would be to state the permeability of the wall, top, or total framework cover taking a stress variation of fifty Pascals over the wall. The permeability is subsequently calculated whilst the quantity of atmosphere (in cubic yards) that’ll move within an hour via a square-metre of wall (or top, or ground) and indicated as m³/h/m² (m³/hm² or m/h) in a stress variation of fifty Pascals (50 Pa).

Although leaks within the structure is what produces draughtiness and ventilation, what’s more essential for the structure and its own residents may be the pace where atmosphere profits through the framework. That is most basically calculated whilst the quantity of occasions the atmosphere within the building changes each time (found as ac/h). This can rely on the stress difference between your exterior and also the within the building, and again the tradition would be to suppose a stress variation of fifty Pa.

The connection within both of these steps is distributed by the next formula:

Atmosphere modifications each hour = Permeability x exterior area of creating x Internal amount of construction

The transformation from oxygen changes each hour at 50 Pa to atmosphere changes per hours under standard circumstances (around 4 Pa) is also sophisticated to describe today. In one single creating a genuine 0.8 ac/r was equal to 14 ac/h (50Pa).

Noise Insulation

Windows are among the most vulnerable areas of a building to sound transmission because of their pretty lightweight design. With respect to the quantity of openings and also the quality of the seals between your opportunities, just one glazed screen without any seals might just accomplish a sound reduction of 18 – 25dBA. While shut, covered double-glazed products execute hardly much better than simple glazing since the 2 panes of glass are strictly associated with a minimal hole therefore the 2 panes resonate as you.

Another screen having an air-space of 10cm or even more de couples the motion of the two panes of glass and decreases the resonance between your two. Noise efficiency as high as 45dBA may usually be received.

Improved quantities of noise insulation are achieved whilst the space develops especially if the screen shows are actually covered having an audio content, though minimal improvements occur with cavities over 200mm. The usage of heavier or traditional laminate glass-within the extra screen also enhances the traditional abilities of the installation.

Protection from UV light

Ultraviolet (UV) lighting in the sunlight could potentially cause substantial harm to pictures, materials, decorating and other items. The usage of a movie, possibly in laminated glass within the extra glazing product or placed on like a film towards the main screen, may absorb ultraviolet lighting and decrease this threat of harm.

Solar gain

Windows may disclose considerable amounts of solar power resulting in overheating. Extra glazing could make this more severe when they reduce summer season ventilation. Although, middle-pane shades, glare films and summertime ventilation of the air-space may be used to make the area less warm.

Some extra glazing methods could be removed within the summertime.


All air contains some water vapour, but comfortable air holds more vapour than cold air. The moment comfortable, moistened air is cooled it’ll achieve a heat where it can’t hold-all the vapour, and also the water may reduce out. This heat is known as the dewpoint.

Hot moist air passing over a chilly area might be cooled locally below the dewpoint by which event humidity build up or condensation may occur. This result causes the accustomed condensation inside of cool windows. Condensation about the exterior screen may occur when the extra program is exposed for ventilation in coldweather particularly where areas are fairly damp.

These condensation risks are likely to be reduced where the extra glazing is both:

*able to be kept closed-in cold weather, since you will find alternate way of ventilation- older attributes generally have sufficient ventilation from other areas

*found where the standard path of ventilation is from external to inside, for instance about the windward side of the framework, about the lower surfaces or in which a chosen organic or physical removal solution helps you to assure inward airflow

*fitted with products which prevent slow ventilation in unwanted problems

*where the main and extra devices include some choice way of ventilating between your exterior and also the space inside but skipping the hole between your primary and secondary glazing

Historical buildings security

Another screen provides an additional buffer to accessibility and so may provide enhanced protection. This is often especially appropriate once the utilization of a historical building has been altered and an enhanced level of security and safety is needed. The secondary glazing can offer that extra protection while protecting the present windows.

14 Jun

What to keep in mind when glazing your house

Glass designs can be the most intricate and appealing features of a home, however, for this same reason they can often be the most difficult aspects to repair. Glazing intricate designs is no easy task and often requires a professional glazer to ensure that it is done correctly. The glazing process involves cutting, installing and removing glass according to the specifications provided. However for simple breaks you may find it easier to repair the glass yourself than to hire outside help. While it can be a fun home improvement project it can also have more components that may not have been anticipated. Here are a few items you should keep in mind when completing your next glazing project.

Functional or design – When getting an area glazed you should keep in mind whether design or function is of most important or maybe even both. In some cases for example, repairing a window, the design or aesthetics of the glass feature may not be of utmost importance. Instead, more concern may be placed in ensuring that the glass is sturdy and cannot be broken as easily (which could be achieved by double-glazing). However if you are glazing a kitchen cupboard or event and cabinet door, you may find that the design and look of the glass is important. Additionally in some homes, stained glass may have been a major feature of the house, so you may want to get  a professional with experience in that area to complete the repair rather than take on the project on your own. Therefore to retain the character and charm of the home you will want to spend effort to ensure that the design of the glass is done tastefully.

Glazing tools – Due to the complexity of the glazing process, the right tools need to be obtained in order to ensure that the work is completed safely and effectively. For larger projects it may be best to consider hiring a professional glazier as the project may need more heavy duty, industrial machinery. However for smaller, minor repairs such as cracks or chips homeowners can easily complete the tasks with the right tools. The standard tools needed for a glazing project include a heat gun, knifer, putty and sander. To tackle a chipped glass surface, the area will be softened in order to remove the glass. Once this has been removed any glazing compound on the surface will have to be removed. The surface will then have to be made smooth in order to meld the old and new surfaces together. Getting the right tools for the job in most cases is half the work, and in the long run end up giving you much more savings by doing the project yourself.

Type of glazing – when reglazing a surface you must first determine what type of glaze needs to be used. The most commonly used are latex or oil based glazes. Latex is easier to work with, however oil glazes have a more professional and refined look. When using oil it must first be heated and then applied to the glass surface in order to be molded. The latex glaze on the other hand is easy to spread over but it takes a long time to completely dry throughout.  If you are not sure what type to use stop by you nearest home improvement store and ask for suggestions. Make sure that you take a minute to think this through before starting your project.

Protective equipment – Before commencing any work on glass it is important that you purchase the proper protective gear. Although it goes without saying, working with glass can be very dangerous and a tiny slip or crack can cause major damage. For most home improvements projects involving glass you will need a pair of protective glasses and thick gloves. In some instances persons apply heat to the area in order to make the glass easier to work with, however it is critical that care be taken prevent heat from being applied to flammable material. Fire can spread very quickly and cause unintended damage to the home. Take the extra time to ensure that you have the right equipment in place to reduce damage and prevent injury.

Budget – make no mistake about is, glazing can be a costly endeavor. Especially if the area to be glazed has specific requirements or needs a special type of glass. Too often persons chose to select glazing services based on which one ends up being the cheapest, however this is a narrow-sighted view. When it comes to things like glazing, you are investing the value of the home. Glass designs and features often create a beautiful environment that attracts a range of persons. Therefore in the event that you have to sell your home, spending that extra money for quality will go a long way in getting better return. Moreover, when you are living in a house the worse feeling is waking up every day and looking at a feature that was not finished properly. It can create and eye sore or even make you feel uncomfortable whenever you catch sight of it. Now I am not encouraging overspending, however I am encouraging you to ensure you select quality services rather that blindly selecting the cheaper option.

Although glazing can appear to be a simple task, it can quickly become complicated depending on the type of material being used and the complexity of the design. Repairing broken glass in window or doors can be a fun challenge for regular do-it-yourselfers. However projects where the glass features are more involved it may be better to hire the services of a professional emergency glazier. While it may cost a little extra, the benefit in the long run will be worth the investment.Repairing items like glass increase the overall aesthetic of a home and also add a feeling of charm and character. Jot these tips down and be sure to keep them in mind the next time you complete your glazing home project.