GLASS SELECTION GUIDE

Transcription

1 GLASS SELECTION GUIDE

2 GLASS SELECTION The Glass Selection Flow Chart should be used in conjunction with the Selection Sheets and Section of the Catalogue and Reference Guide to assist with solving each design challenge you are faced with. FLOW CHART Circle priority number in each step. Each step is detailed in Glass Selection Guide. Priority 1 = Highest, Priority 5 = Lowest Start here Go to Step 1 Do you want to Reduce Heat Loss? Priority Yes Circle priority 1-5 and go to Step 2 No Step 2 Do you want to Control Condensation? Priority Yes Circle priority 1-5 and go to Step 3 No Step 3 Do you want to Reduce Heat Gain? Priority Yes Circle priority 1-5 and go to Step 4 No Step 4 Do you want to Reduce Glare? Priority Yes Circle priority 1-5 and go to Step 5 No Step 5 Do you want to Reduce Fading? Priority Yes Circle priority 1-5 and go to Step 6 No Step 6 Do you want to Reduce Noise? Priority Yes Circle priority 1-5 and go to Step 7 No Step 7 Do you want to Increase Safety? Priority CIP Yes Circle priority 1-5 and go to Step 8 Step 8 Do you want to No Improve Aesthetics? Priority Yes Circle priority 1-5, select colour preference and go to Step 9 No What colour is preferred? Clear Blue Dark Medium Light Green Dark Medium Light Bronze Dark Medium Light Grey Dark Medium Light Reflective High Medium Low Step 9 Do you want to Glaze Large Windows? Priority Yes Circle priority 1-5, fill in detail and go to FINISH No FINISH Largest window size=height Windzone or windload x width

3 PERFORMANCE The Performance Data Graph below is designed to enable key performance properties of different types to be plotted and compared with each other. The performance data can be taken from Section 12 of the Catalogue and Reference Guide or from other reliable sources. The plotted performance can be compared with the Rating Zone which gives a guide to good all-round performance of the glazing. Note: In some cases specific design requirements may mean the ideal is outside the Rating Zone. Performance Glass type heat loss & fading glare heat gain condensation acoustics % Rating Zone FRC VLT SC U PSR fading reduction coefficient visable light transmission shading coefficient u value percieved sound reduction

4 HEAT LOSS (INSULATION) Heat Loss from the thermal envelope is a key factor in modern housing design. In winter the Insulating Glass Unit can trap heat inside the house and thus reduce the amount of heating required (kwh) to maintain a comfortable environment. In summer the Insulating Glass Unit can trap the cool air inside the house and reduce the amount of cooling required to maintain a comfortable environment. In all seasons the Insulating Glass Unit can reduce the energy loads on Heating, Ventilating and Air Conditioning (HVAC) systems. 4mm clear 12mm airspace 4mm clear GlassTech IGU Is because it meets the minimum requirements for thermal insulation for housing and small buildings (NZS 4218). 4mm Low E 12mm airspace 4mm clear GlassTech Low E + IGU Low E provides thermal insulation as it traps the heat inside by reflecting long wave radiation. 4mm Low E 12mm Argon 4mm clear Thermal spacer GlassTech Low E + IGU and Argon + By combining Low E and argon gas the thermal insulation is achieved. Thermal spaces can be used in thermally efficient frames to improve the total window performance.

5 PERFORMANCE DATA The following tables compare the insulation performance of clear IGUs, for a range of air or argon spaces. The heat loss reduction % compares the heat loss (U Value) to that of single 4mm clear. Changing the thickness will have minimal effect on the insulation. 12mm airspace 4mm clear 4mm clear Insulation comparison U Value* Heat Loss Reduction** 4 Clear 6 4 Clear % 4 Clear 8 4 Clear % surface # GlassTech IGU 4 Clear 10 4 Clear % 4 Clear 12 4 Clear % 4 Clear 14 4 Clear % 4 Clear 16 4 Clear % 12mm airspace 4mm clear 4mm Low E Insulation comparison U Value* Heat Loss Reduction** 4 Clear 6 4 N70 Low E % 4 Clear 8 4 N70 Low E % surface # GlassTech Low E + IGU (Climaguard N70 Low E # 3) 4 Clear 10 4 N70 Low E % 4 Clear 12 4 N70 Low E % 4 Clear 14 4 N70 Low E % 4 Clear 16 4 N70 Low E % 12mm Argon 4mm clear 4mm Low E Insulation comparison Argon Space U Value* Heat Loss Reduction** 4 Clear 8 4 N70 Low E % surface # GlassTech Low E + Argon + IGU (Climaguard N70 Low E # 3) 4 Clear 10 4 N70 Low E % 4 Clear 12 4 N70 Low E % 4 Clear 14 4 N70 Low E % 4 Clear 16 4 N70 Low E % * U Values are centre of values in W/m2K calculated on Thermal software using NFRC conditions - Argon spaces are 90% argon and 10% air. ** Heat Loss Reduction is calculated compared to 4mm clear float (U value = 5.89). # Surface number. The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

6 CONDENSATION Internal condensation that forms on glazing is a key factor in modern housing design. Condensation can damage fabrics, furnishings and framing and create an unhealthy environment. Condensation is a function of relative humidity (%RH) of the air, the indoor and outdoor temperature and the insulation properties (U value) of the glazing. Insulating Glass Units can reduce the onset of internal condensation by keeping the interior surface warmer. GlassTech IGU Is because it meets the minimum requirements for thermal insulation for housing and small buildings (NZS 4218) and keeps the inside surface warmer than single glazing. GlassTech Low E+ IGU Low E provides thermal Low E insulation as it traps heat inside by reflecting long wave radiation and keeping the inner warmer. Argon gas GlassTech Low E+ and Argon+ IGU By combining Low E and argon gas the Low E thermal insulation is achieved and the inner at it warmest. Thermal spacers can be used in thermally efficient frames to improve the total window performance, and the edge area condensation that can occur with normal windows. PERFORMANCE DATA Refer to Metro GlassTech Catalogue and Reference Guide Section External dew (which is sometimes known as external condensation) can occasionally occur on the outside of high performance Insulating Glass Units in temperate climates. The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

7 CONDENSATION Air is a mixture of gases including water vapour. At any given temperature there is a limiting maximum vapour pressure, called the saturated vapour pressure, where the air cannot hold any more water vapour. If air, containing water vapour, comes into contact with a cooler surface the excess moisture is deposited on the surface as condensation. The surface temperature at which condensation begins to form is called the Dew Point. The ratio of the water vapour pressure at room temperature to the saturated water vapour pressure at that temperature is known as the Relative Humidity (RH), and is expressed as a percentage. Relative Humidity is a measure of the water content of the air at a given temperature. Many domestic activities, such as cooking and washing, will liberate water vapour and increase the relative humidity and thus the occurrence of condensation. In all cold temperature climates, condensation can occur on the inside of windows when the external temperature falls significantly below the internal temperature and cools the. The onset of condensation on the interior surface can be controlled either by reducing the humidity, thereby lowering the dew point, or by raising the inside surface temperature. The latter can be achieved by increasing the insulation of the window by the use of an Insulating Glass Unit as the lower the U Value the less the risk of condensation forming. GlassTech IGU s reduce the likelihood of condensation forming by providing a thermal barrier between the inside and outside. The use of Argon Gas and/or Low E further enhances the U Value performance, making the inner warmer, and thus helping to inhibit condensation. CONDENSATION PREDICTION CHART U Value Inside Temperature ( C) Relative Temperature (%) When the internal air temperature is 20ºC and the relative humidity is 60%, condensation will not form on double glazed units with the U Value 3.0 W/m2K until the external temperature falls below -2ºC. Under the same internal conditions, condensation will form on single with U Value 5.8 W/m2K when the external temperature falls below 10ºC. The four parameters for predicting the conditions under which condensation will occur are: 1. Inside air temperature 2. Outside air temperature 3. Indoor relative humidity 4. U Value of the glazing. If any 3 are known the other is derived from the chart above. How to reduce internal condensation Provide natural ventilation through an opening window or proprietary ventilating unit during the day to permit air changes. In cold weather heat the rooms and keep the inner surface warm. Keep the rooms heated if possible and an insulating unit will retain the heat. Use HVAC systems to control temperature and humidity. Ventilate gas heaters. Use heaters that provide warm dry air. Use dehumidifiers until the air is dryer, this helps the temperature as dry air is warmer. Fit extraction systems in cooking and bathrooms areas. Draft proof external doors and windows to prevent damp humid air getting inside. Draft proof internal doors and keep closed if near kitchens and laundry areas. If using heavy drapes and curtains allow the warm air to circulate between the drapes and by ventilating with a 20mm min gap and open gaps at the top and bottom. If using radiators, position them near to the so the inner is warm. Use thermally efficient frame materials or designs to reduce frame condensation.

8 HEAT GAIN (SOLAR CONTROL) Heat gain from the sun is a key factor in modern housing design. In winter the Insulating Glass Unit can allow the sun to warm the house and thus reduce the amount of heating required (kwh) to maintain a comfortable environment. In summer the Insulating Glass Unit can control the sun s heat, with the help of special solar control es and thus reduce the amount of cooling required to maintain a comfortable environment. In all seasons the Insulating Glass Unit can reduce the energy loads on Heating, Ventilating and Air Conditioning (HVAC) systems. Building shading, blinds and drapes can also be used to reduce heat gain, but care is required to ensure thermal stress breakage does not occur in the. Low E GlassTech Low E + IGU Low E such as Climaguard N70 used as the outer pane of the IGU with the coating on surface 2 is good as it will reduce the solar heat gain, by lowering the shading coefficient of the glazing. Tinted GlassTech Tinted IGU Tinted used as the outer pane of the IGU is better as it absorbs solar energy and will reduce the solar heat gain, by lowering the shading coefficient of the glazing. Tinted es vary in colour and performance, with the most common being grey, bronze and green for housing. Low E Tinted GlassTech Tinted Low E + IGU By combining tinted and Low E coatings the best heat gain performance can be achieved. In addition reflective es can be used as they are the VERY but they are not common for housing.

9 PERFORMANCE DATA The following tables compare the Shading Coefficient (SC) performance for a range of solar control IGUs. The Shading Coefficient compares the solar heat gain of the with that of 3mm clear float which has a SC of 1. Changing the air space will have minimal effect on the SC. shading coefficient comparison Low E Shading Coefficient Clear Clear 12 4 Clear surface GlassTech Low E + IGU (Climaguard N70 Low E # 2) The above data has been included for reference 4 N70 Low E 12 4 Clear N70 Low E 12 5 Clear 0.62 shading coefficient comparison Tinted Airspace Shading Coefficient 5 Grey 12 4 Clear Bronze 12 4 Clear 0.59 GlassTech Tinted 5 Green 12 5 Clear 0.59 IGU 6 Grey 12 5 Clear surface 6 Blue 12 5 Clear Evergreen 12 4 Clear 0.50 shading coefficient comparison Tinted Low E Airspace Shading Coefficient 4 Green 12 4 N70 Low E surface GlassTech Tinted Low E + IGU (Climaguard N70 Low E # 3) 5 Bronze 12 4 N70 Low E Grey 12 4 N70 Low E Green 12 5 N70 Low E Grey 12 5 N70 Low E Evergreen 12 5 N70 Low E 0.42 *Shading Coefficients are calculated on Thermal software using NFRC conditions and will vary with type. ** The shading coefficient compares the solar heat gain of the with that of 3mm clear float. # Surface number For more options refer to the Catalogue and Reference Guide Section 12 The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

10 GLARE (Visible light) Glare caused by bright sunlight is a key factor in modern housing design. Large areas of glazing are great for views and sunlight but if not controlled by shade or orientation they can create very bright light and glare inside the home. Low angle morning summer sun from the east and low angle winter sun from the west can be difficult to control without using solar control, blinds or drapes. Glare is a function of the Visible Light Transmission (VLT) and the sun s incidence on the. Low E GlassTech Low E+ IGU Low E such as Climaguard N70 is used in the IGU with the coating on surface 2 or 3 is as it will reduce the visible light transmission (VLT) of the glazing and reduce the glare from the sun. Tinted GlassTech Tinted IGU Tinted used as the outer pane of the IGU is better as it reduces the visible light transmission (VLT) even further depending on the tint colour and thickness. Tinted es vary in colour and performance, with the most common being grey, bronze, blue and green for housing. Low E Tinted GlassTech Tinted Low E+ IGU By combining tinted and Low E coatings a further reduction in VLT can be achieved. In addition reflective es can be used as they are the VERY but they are not common for housing.

11 PERFORMANCE DATA The following tables compare the percentage Visible Light Transmission (VLT) for a range of IGUs. VLT Comparison Low E VLT % 3 Clear 90 4 Clear 12 4 Clear surface GlassTech Low E + IGU (Climaguard N70 Low E # 2) The above data is included for reference 4 N70 Low E 12 4 Clear 69 4 Clear 12 4 N70 Low E 69 VLT Comparison Tinted VLT % 5 Green 12 5 Clear 71 5 Evergreen 12 4 Clear 64 GlassTech Tinted 4 Grey 12 4 Clear 51 IGU 5 Grey 12 4 Clear surface 5 Bronze 12 4 Clear 53 6 Blue 12 4 Clear 52 VLT Comparison Tinted Low E VLT % 5 Green 12 4 N70 Low E surface GlassTech Tinted Low E + IGU (Climaguard N70 Low E # 3) 5 Evergreen 12 4 N70 Low E 54 4 Grey 12 4 N70 Low E 43 5 Grey 12 4 N70 Low E 38 5 Bronze 12 4 N70 Low E 45 6 Blue 12 4 N70 Low E 44 * VLT is calculated from Thermal software using NFRC conditions and will vary with type. # Surface number For more options refer to the Catalogue and Reference Guide Section 12 The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

12 FADING (UV ELIMINATION) Fading caused by the sun s solar radiation is a key factor in modern housing design. The main cause of fading is ultraviolet light (UV) but visible light, infrared radiation, humidity and pollutants all play a part. Insulating Glass Units can reduce the amount of radiation entering the home, by using a combination of types. In general terms, the lower the Fading Reduction Coefficient the less fading occurs. Clear laminated or Low E GlassTech Laminated IGU Laminated is good because the PVB interlayer absorbs UV light. Low E is good because the coating reduces UV transmission. or Low E Tinted GlassTech Tinted IGU Tinted is better depending on the tint colour and type as it absorbs UV, visible and infrared radiation. Low E helps to reduce the UV transmission even further. Clear laminated Tinted GlassTech Tinted & Laminated IGU By combining tinted and laminated the best fading reduction can be achieved. In addition reflective es can be used as they are the VERY but they are not common for housing.

13 PERFORMANCE DATA The following tables compare the Fading Reduction Coefficient (FRC) for a range of IGU s. The FRC compares the fading reduction of the glazing with 3mm clear, which has a FRC of 1. The lower the FRC the lower the rate of fading. Fading comparison or Low E Clear laminated FRC** Clear 1.00 GlassTech Laminated IGU with or ClimaGuard N70 Low E 4 Clear 12 4 Clear 0.78 The above data is included for reference 4 N70 Low E 12 4 Clear Clear Lam Clear Lam 0.40 Fading comparison Tinted or Low E FRC** 6 Bronze 12 6 Clear 0.36 GlassTech Tinted IGU with or ClimaGuard N70 Low E 5 Grey 12 4 Clear Evergreen 12 6 Clear Grey 12 6 Clear Grey 12 4 N70 Low E 0.31 Fading comparison Tinted Clear laminated FRC** 5 Evergreen Lam 0.25 GlassTech Tinted & Laminated IGU 5 Bronze Lam Grey Lam Grey Lam 0.22 * UV elimination is calculated from Thermal software using NFRC conditions and will vary with type. ** The FRC is derived from the damage weighted transmission data (Tdw-K) and compares the fading of the with that of 3mm clear float. For more options refer to the Catalogue and Reference Guide Section 12 The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

14 ACOUSTICS (SOUND CONTROL) Environmental noise is a key factor in modern housing design. The source and frequency of the sound is important as products behave differently for low to high pitch sounds. Insulating Glass Units can provide a range of acoustic performance by using different types and thicknesses. GlassTech IGU Using thick and es of Float Float different thickness is for sound control. GlassTech Laminated IGU Using standard PVB laminated Laminated Float is as the interlayer dampens sound vibration. GlassTech SoundStop IGU Sound Stop Float Using special acoustic laminated is, especially if one pane is thicker.

15 PERFORMANCE DATA Performance Data The following tables compare the STC/Rw data and Perceived Sound Reduction (PSR) for a range of IGUs. The PSR is a weighted sound reduction comparison that compares the performance as a ratio compared to 3mm float. ACOUSTIC comparison Float Float STC* / Rw* PSR (%)** Float 28 0 The above data has been included for reference GlassTech IGU 4 Float 6 4 Float Float 12 4 Float Float 12 5 Float Float 12 6 Float ACOUSTIC comparison Float Laminated STC* / Rw* PSR (%)** 4 Float Lam Float Lam GlassTech Laminated IGU ACOUSTIC comparison Float SoundStop STC* / Rw* PSR (%)** 6 Float S Float S GlassTech 6 Float S SoundStop IGU Note: S= SoundStop uses Acoustic Grade Interlayer * STC = Sound Transmission Class. * Rw = Weighted Sound Reduction Index. ** PSR = Perceived Sound Reduction is a weighted sound reduction comparison that compares the performance as a ratio compared to 3mm float. S = SoundStop is acoustic laminated. Note: The STC/Rw and PSR data is based on the latest GANZ average data range and may vary from that published in the Metro GlassTech Catalogue and Reference Guide. The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

16 SAFETY (Human impact) Safety for occupants is a key factor in modern housing design. Glass is classified as a hazardous building material in the NZ Building Code Clause F2 and needs to be either protected from human impact, strong enough to withstand impact without breaking, or break safe. Human impact safety requirements are outlined in NZS 4223 Part 3:1999 and in most applications Safety Glass is used. When Insulating Glass Units are used the impact side is usually safety and this normally means inner and outer panes. GlassTech IGU GlassTech IGUs that comply with NZS 4223 Part 3 are because they comply with the NZ Building Code requirements. GlassTech Laminated IGU GlassTech Laminated IGUs are as laminated is a Safety Glass and will stay intact if broken. GlassTech Toughened IGU GlassTech Toughened IGUs are as toughened is a very hard to break and if broken is a Safety Glass as it breaks into small, relatively harmless particles. The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

17 Security Security for occupants and their property is key factor in modern housing design. Normal glazing products provide limited security, but special laminated es are available for a range of application from smash and grab through to bullet resistance. When Insulating Glass Units are used, one or both panes can be a security. Toughened Toughened GlassTech Toughened IGU GlassTech Toughened IGUs are as they are very hard to break, especially if both panes are toughened. Laminated Laminated GlassTech Laminated IGU GlassTech Laminated IGUs are as laminated provides better penetration resistance. Laminated can also be combined with toughened on the outer or inner pane. Security laminated Toughened GlassTech SuperSafelite IGU GlassTech SuperSafelite IGUs are as they include security, such as Anti Bandit or special security laminates designed for forced entry protection. The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

18 COMFORT Comfort for occupants is a key factor for modern housing design. When it is cold outside there are cold zones near windows know as discomfort zones and these are more severe if the glazing is not insulated. Insulating Glass Units improve the insulation and thus reduce the discomfort zones near windows because the inner surface is much warmer than for single glazing. GlassTech IGU Is because it meets the minimum requirements for thermal insulation for housing and small buildings (NZS 4218) and keeps the inside surface warmer than single glazing and thus increasing the comfort zone. Low E GlassTech Low E + IGU Low E provides thermal insulation as it traps heat inside by reflecting long wave radiation and keeping the inner warmer, further increasing the comfort zone. Low E Argon gas GlassTech Low E + and Argon + IGU By combining Low E and argon gas the thermal insulation is achieved and the inner is at it s warmest, providing the largest comfort zone. Thermal spacers can be used in thermally efficient frames to improve the total window performance, thus increasing the comfort zone. PERFORMANCE DATA Refer to Metro GlassTech Catalogue and Reference Guide Section The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the correct to provide the best design solution, and therefore other options, not listed on this sheet, are available from Metro GlassTech. In addition other factors can affect the selection such as the risk of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS

19 COMFORT One of the key benefits of using double glazing as insulation is the increase in comfort. If you sit by a single glazed window/door when it is cold outside you can feel the cold and this is known as the Discomfort Zone. By using Insulating Glass Units the discomfort zones can be reduced even when it is -10ºC outside. Discomfort zones External Temperatures -1ºC External Temperatures -10ºC Single glazing Single glazing Double glazing with Low E Double glazing The above diagram illustrates how discomfort zones occur near a window. The example shows single glazed, double glazed and double glazed Low E windows with external temperatures of -1ºC and -10ºC. At -10ºC, no discomfort zone is distinguishable for double glazed Low E windows. Insulating Glass Units increase the inside temperature to near room temperature and significantly improve the comfort levels of the house. The decisive factor in comfort is the temperature difference between ambient air and the adjacent wall and window surfaces. Most people find a room to be particularly comfortable when the temperature differences between wall () and room air is not more than 5ºC and between foot and head height is not more than 3ºC.

20 CHOOSE THE RIGHT GLASS FOR YOUR HOME When building new, or renovating it is important to ensure you install the best combination into your windows and doors. By combining different types and thicknesses, you can achieve high performing insulating units that will ensure you maximise your design and comfort of your home. Discuss the requirements of each room of the house with your window and door manufacturer and they will advise the best combination to meet your needs. Concerns such as Heat Gain, Heat Loss, Condensation, Glare, Fading, Acoustics and Safety and Security can all be addressed. Heat Loss and Condensation Low E (Low Emissivity) improves insulation Argon is better than air for insulation Argon and Low E can be combined for higher performance Low E and Argon gas further reduce condensation The better the insulation the more comfortable the environment The better the insulation the less condensation will occur Heat Gain The lower the shading co-efficient (SC) the lower the heat gain Tinted es are better than clear. Insulating Glass Units help reduce heat gain Low E can help reduce heat gain Glare The lower the visible light transmission (VLT) the lower the glare Grey and bronze tints generally have lower light transmission Blue and green tints generally have higher light transmission Insulating Glass Units slightly reduce the light transmission Reflective es can cause internal glare at night Fading The higher the UV elimination the lower the level of fading The lower the visible light the lower the fading The lower the heat gain the lower the fading Laminated helps reduce fading Tinted helps reduce fading Acoustics Thicker will help reduce noise Laminated will help reduce noise Insulating Glass Units will help reduce noise Different thicknesses in an IGU will help reduce noise Safety and Security Toughened and Laminated are both Grade A Safety Glasses An IGU can have one or both sides with Safety Glass depending on the impact location Use Safety Glass for sloped and overhead glazing Special Safety Glasses can provide levels of security Trust New Zealand s leading and glazing company to provide the expertise and Branches located nationwide quality your home deserves Call us