Sustainable Airtight Building Solutions

Transcription

1 Sustainable Airtight Building Solutions

2 What is sustainable airtight building? Airtight building makes undesirable air flows manageable. It ensures that cold air does not transfer to warm parts of the building. It also prevents the escape of warm air, saving energy costs. Perfect zipper An airtight building is comparable with a modern ski jacket. A good insulating lining that is airtight and yet breathable. Excess moisture will be transferred in a controlled way through the skin of the jacket. This jacket can only work if the zipper is closed. When the zipper is open, you feel the cold air and you lose a lot of heat. This jacket works the same as a well-executed building shell. That zipper, is one of the specialisations of Den Braven. Why sustainable airtight building? Airtightness becomes increasingly important. All governments are committing to European regulations and setting requirements regarding the energy performance of a building. This is all related to decrease the energy consumption for heating demands. In all countries worldwide that must obey the new regulations of the Passive House Standards or Energy Neutral Standards, airtightness is the second most important design aspect. Our technical sales representatives can explain all about the worldwide demands and local needs about those standards and airtight building solutions. Den Braven introduces not only the concept of airtightness in building constructions but combines this with sustainability and durability. The part sustainable refers not only to the sustainable construction but also represents the green image of the products and the company itself. Sustainable entrepreneurship is the future The green objectives of the organisation results into profitability. More environmentally friendlier raw materials are used in our products. These greener products can be found in the product portfolio Sustainable Airtight Building Solutions. When applied correctly these products contribute to a better air loss control through the building to prevent expensive energy loss. Also the manufacturing processes of our products are subjected to sustainability. An efficient machine park and energy savings at workplaces is the way of the future. Even Den Braven s own new building projects are constructed according the newest energy efficiency. Regulations, as we believe we have a role model function in our community Cradle-to-Cradle Environmentally-friendlier produced products can not only extend the life span of a building which will be beneficial for the financial value of the building but can also meet the needs for the concept of Cradle-to-Cradle. 02

3 Sustainable airtight building solutions of Den Braven A superior airtight building will ensure favourable ventilation and temperatures while preventing moisture damage. A Passive House s airtightness must surpass with a blower door test at a 50 Pascal pressure difference if it will not exceed an air exchange of 0.6 time hour. Airtight building solutions of Den Braven can be a sufficient system in your complete Passive House approach. All components creating the building envelope must be well insulated. Edges, corners, connections and penetrations must be planned with special care in order to avoid thermal bridges. The entire window (glazing and frame) should have a U-value of 0.80W/(m 2 K) or less. The insulated glass unit should have an solar transmittance of at least 50% and the spacer bars must be thermally separated. Ventilation units with heat recovery are key in terms of energy savings, as they ensure that the warmth carried by the exhaust air is not wasted, but first transferred to the incoming fresh air without the two air streams ever physically mixing. For many of us the term airtight building is a scary thought as we think of it as living in a plastic bag. However, an airtight building makes undesirable airflows controllable. It supports the reduction of the energy consumption by to 90%. It saves you money and provides a better interior environment. Strive to quality Airtight building or passive building is no hype or a new building trend. It s a commitment to a very high sustainable and durable building quality. You only want the best of the best to protect your property. A B C D E F G A B C D E F G Save up to 90% on your energy costs Facts and figures The urban area consumes about 35% of our total energy consumption. An average household consumes 80% of its energy just to heat the house. An average home in the Netherlands consumes approximately 1,897 m 3 (22380kWh) of gas per year. An average annual consumption of 1,897 m 3 of gas per year corresponds to 16.9 m 3 /m 2 or 200 kwh/m 2. To keep your home at a constant temperature it costs per 1 C/year. An average house, according to the passive house standard consumes 330 m 3 (3890 kwh) of gas per year instead of 1,897 m 3 (22,380 kwh). A house is a passive house when the maximum annual energy consumption is below 1.3 m 3 gas/m 2 or 15 kwh/m 2. A passive house which is in fact airtight, saves up to 90% on energy costs. A hair dryer is sufficient to heat a passive house of 100 m 2. If only 50,000 new homes per year are build according to the passive house standard, it decreases the energy consumption of gas with 61 million m 3 per year and reduces the CO 2 emissions with 110 tons, compared to a traditionally built house. A well designed and built passive house is only 5-6% more expensive than an existing home. An energy-efficient and sustainable home will have a higher value increase. 03

4 The Principle The present building physics, the Passive House Standard and the Building prescriptions are the foundation for the product range and concept of Den Braven s Sustainable Airtight Building Solution. Each seal is tested on three aspects, air tightness, thermal insulation weather and driving rain. These three aspects are reflected in the Sustainable Building Airtight logo. A fourth aspect is becoming increasingly important, noise reduction. Den Braven has developed a set of icons to simplify the product selection. On the technical data sheets, packaging and in our communication tools- like this brochure - we use these icons to make it as easy as possible. Our Sustainable Airtight Building concept consists of products that have been carefully selected and meet the highest requirements. Den Braven can provide calculations to show how efficiently the concept is. Den Braven offers you a complete range of products to meet the current building regulations whether it is for new construction or renovation projects. 1 2 Strive to minimize air loss and to keep the valuable warm air inside. Ensure a continuous thermal insulation to prevent shifting in the dew point. Air sealing The seal on the inside is the connection that must be airtight. This prevents cold air coming in and warm air going out. This way the pressure of the cavity can be equalized. Red is the colour that is synonymous with heat. In the corresponding icon you will find the colour red. Thermal insulation If the airtight seal is correctly positioned on the inside of the construction we need to focus on the second aspect to develop an energy-efficient building, insulation. The thermal value of this seal has to be at least equal to that of the attached building parts to ensure the isothermal not moving inwardly. It will prevent the risk of condensation or transfer it to the outside of the construction. In general yellow is the colour for insulation, also used in the associated icon. Moisture The final component of a good functioning joint is to ensure that primary water penetration is suppressed as much as possible. If by any failure moisture arises within the construction we don t want it inside, but drain it outwards. Therefore the waterproof layer on the outside has to be rain-tight and simultaneously be able to breathe from the inside. The colour of water and cold is blue, so also in the associated icon. 3 Primary breathable (permeable) water barrier to avoid excessive moist Luchtdichting Thermisch herstel Slagregenkering Noise reduction In a passive house or neutral energy house a comfortable indoor climate is essential. But comfort is not only related to the energy consumption of the house, it also includes a pleasant noise level. Den Braven also offers solutions for this issue. Many of Den Braven products have noise transfer reports fitting within the latest regulations. 3 1 Fire retardant Fire retardant is also applicable within the low energy consumption concept. Den Braven has many certified passive fire retardant products that contribute to your safety. By applying the airtight building concept you already eliminate one factor from which a fire can grow and that is the supply of oxygen. Please contact Den Braven for advice on our Fire Retardant products. The Zwaluw range for sustainable airtight building gives you the most value: Reduces air loss per meter Best quality Highest efficiency 04

5 Details Traditional Recommended products Zwaluw Butylband Zwaluw Compress Band BG1 Zwaluw Flex-foam B2 or B3 All Seasons Zwaluw Compress Band 2D Zwaluw Polyflex Façade Zwaluw Polyurethane-15LM Zwaluw Silicone-NO 05

6 Details Timber Housing Recommended products Zwaluw Butylband Zwaluw Compress Band BG1 Zwaluw Flex-foam B2 or B3 All Seasons Zwaluw Compress Band 2D Zwaluw Polyflex Façade Zwaluw Polyurethane-15LM Zwaluw Silicone-NO 06

7 Airtightness Airtightness is the resistance of the building to inward or outward air leakage. Excessive air leakage results in increased energy consumption and a draughty, cold building.air leakage is driven by differential pressures across the building. Air leakage occurs when outside air enters and conditioned air leaves your house uncontrollably through cracks and openings. Air Leakage is measured in m3 of air, per square-metre, per hour at 50 Pascal differential pressure (between inside & outside the building). The airtightness or actually the permeability of a building can be calculated. In the Passive House Standard calculations a pressure difference of 50 Pa is the standard. 50 Pa is approximately wind force 5 (Beaufort scale). This calculation provides us the loss of air in m 3 per hour. The airtightness coefficient for a land-related house with an average volume of 450 m 3 has a standard value of 70 m 3 /h. qv;p = C. p n qv;50 = ,625 qv;50 = m 3 /h Blower door test A blower door test is to measure the airloss of a building. A building or part of a the building will be put at 50 Pascal under and over pressure and will be pressurized to be able to determine what the loss in pressure is in the building. When pressure loss occurs the air leaks in the building can be identified and rectified. A blower door test will be mandatory as of 2015 before a house or building is completed. A blower door test is nothing more than a frame placed in a doorway with tarpaulin and a fan. The fan is connected to an air pressure meter. By entering the size of the measured space in a computer program the possible air loss is determined. The method is described in the Passive House Standard. The results of the test at an over-and under pressure of 50 Pascal is indicated in N50, per m 3 /hour. The N50 is determined as follows: N50 = (N50 over pressure + N50 under pressure) / 2. In order to be able to determine the air loss throughput, the N50 has to be divided by the surface of the survey area: N50 / A [m 3 / h, m 2 ]. η = m 3 /h η = 1, m 3 /h / 450 m 3 η = 1.79/h In this example, this house has a ventilation rate of 1.79 of where a maximum of 0.6 is allowed. Den Braven can assist to decrease the airloss and to achieve the Passive House Standard. Image: RAAK Energie advies 07

8 Another way to determine the air tightness is by measuring the number of times the space is refreshed with air per hour. If the air in a certain space is refreshed in one hour the value or ventilation rate is 1. A value of air replacement of 0.6 or higher is sometimes used as a benchmark to check for leaks. The Passive House Standard provides default values for the loss of air in both m 3 /h and m 3 /h.m 2. The ventilation rate can be theoretically calculated in advance. Den Braven provides for all relevant products offered within the Sustainable Airtight Building concept the correct values of air loss per meter for joints. By selecting the right products with the corresponding values for air loss and multiplying by the total number of linear meters, we can calculate the theoretical total air loss for the building. For a blank spread sheet, please see page 11 of this brochure. 08

9 Zwaluw Toolbox Calculator Calculation qv;50 and ventilation rate. Calculate dimensions sealant and back rod. Volume determination joints. Calculation qv;50 and ventilation rate By completing the table on page 23, the total air loss of the building can be determined. For every Den Braven product in this brochure, the c-value (airloss/m 1 ) is listed. Multiply the lowest value per line with the total number of meters and add together all total at the bottom of the table(c = lj.aj). Calculation qv,50 If the calculated total air loss of the building is 5.5 m 3 /h and has a capacity of 600 m 3 with a wind pressure of 50 Pascal this is the result qv,p = C. pn qv;50 = ,625 qv;50 = m 3 /h Ventilation rate The ventilation rate indicates how often a home is refreshed per hour by in-and exfiltration! η = m 3 /h / 600 m 3 η = 0.105/h qv,p = air flow rate at a specific air pressure C = Air Loss Coefficient (± 1,5 m 3 /h) p = pressure, 50 Pa in Passive House Standard n = Flow Exponent (0.625) η = Ventilation rate Example An elastic sealant has to be applied between two concrete elements of five meters in length each. The choice can be Zwaluw Silicone-NO. minimum temperature -15 C maximum surface (concrete) temperature +55 C ΔT = (-15 C) - (+55 C) = +70 C linear expansion coefficient of concrete is mm/m 1 / C maximum deformation Zwaluw Silicone-NO is 25% Change in length: ΔL = α x L x ΔT ΔL = x 5 x 70 ΔL = 4.2 mm = 5 mm Joint width (minimal): W joint = ΔL x (100% / 25%) W joint = 5 x 4 W joint = 20 mm Joint depth (minimal): D joint = (W / 3) + 6 D joint = (20/3) + 6 D joint = 13 mm Back rod diameter: W back rod = W + 50% W back rod = % W back rod = Ø 30 mm. In this example, the house has a ventilation rate of This house of 600 m 3 loses m 3 air per hour. Calculation sealant dimensions Processing sealant is a specialised field. There are many different types of sealants available. Substrate, tolerance, the intended result and the correct joint dimensions must be taken into consideration. Den Braven can assist you, but if you already selected the correct product, then you can simply calculate the correct joint size. All common (building) materials are subject to movement. This can be as a result of fluctuation in temperature, differences in humidity and mechanical strain. Below see how to calculate the sealant required. For a perfect joint, Den Braven recommends to clean the adhesive surface thoroughly, to use a primer, to apply the correct back rod and finish the sealant well by using Zwaluw Finisher. 09

10 Advice: Clean surface with Zwaluw Cleaner. Pretreat surface with Zwaluw Primer U12. Place Zwaluw Back rod (open cell) with the top of the back rod 13 mm below surface. Apply Zwaluw Silicone-NO sated, tight and plenty in the joint of 20 x 13 mm (w x d). Press firmly and finish the joint smoothly with Zwaluw Finisher. Volume determination sealant joints We have defined that we have a minimum sealant joint of at least 20 x 13 mm (w x d), but how many cartridges or foil packs do we need to order. The calculation below is indicative, waste loss is not included. Example To calculate the number of cartridges and / or foil packs, the number of meters and the minimum joint size are required. In this example we use the calculated sealant joint Zwaluw Silicone-NO with 310 ml per tube of 20 x 13 mm atherefore this project is 250 linear meters. Litres of sealant per meter: L sealant = d (mm) x D (mm) / L sealant = 20 x 13/1000 L sealant = 0.26 litre/m 1 Number of cartridges: Xn cartridges = litres x meters / cartridge content (litres) Xn cartridges = 0.26 x 250 / Xn cartridges = 210 cartridges 10

11 Table calculation airloss Calculation air loss house / building Nr. Detail description Length Choose air sealing Choose insulating product Choose rain barrier Total air loss per component 1 Nave 2 Roof ridge 3 Joints between window frames and wall / facade construction 4 Joints between skylights and roof construction 5 Joints between roof and construction wall 6 Joints between roof elements 7 Joints between facadeand wall construction 8 Joints between facade construction and floors 9 Opening in ground floor 10 Openings in roof construction 11 Bay Window Frames 12 Wet glazing 13 Side wall roof against construction wall 14 Skylight 15 Dormers 16 Gutter Total linear meters Total air loss 11

12 Service and Advice Den Braven Group is willing to offer advice and information, to support your selction for product or system. We can provide training and presentations at our training centres or at any requested location. Contact Den Braven for tailored training. If you or your client has to choose the right sealant from the shelf in the construction- or hardware store, we also have the solution. There is a complete packaging- and communication concept available for Sustainable Airtight Building. This is developed to choose the corrent product(s) and / or options, without our help. Of course we are more than willing to explain the possibilities in a personal meeting. Product presentation & training in our training centre or onsite. Technical training Sustainable Airtight Building. Train the trainer course. Advice and application directives. In store marketing concept; complete packagingand communication concept, developed to choose quickly and easily the correct product and / or system options Easy calculating tool available 12

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15 Den Braven Sealants B.V. Denariusstraat RC Oosterhout P.O. Box AD Oosterhout The Netherlands T +31 (0) F +31 (0) E info@denbraven.com