HOW TO CREATE AFFORDABLE PASSIVE HOUSE DESIGN. Andrew Lundberg Passivate

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1 HOW TO CREATE AFFORDABLE PASSIVE HOUSE DESIGN Andrew Lundberg Passivate

2 ABOUT US

3 OVERVIEW

4 1. CERTIFIED PASSIVE HOUSE DESIGNER Engage an experienced Certified Passive House Designer at the earliest stage of design as possible this could save significant time & money down the road! Get a PHPP calculation done on the initial building shape, and use that to determine target values for your building fabric, optimise orientation, size and locate windows properly, determine ventilation system sizing, and determine heat load for heating plant sizing.

5 2. COMPACT FORM 1. Remove heavily-glazed north/east facing over-shaded glazing 2. Remove cantilever below bedroom 3. Re-shape landing window to ensure wider angle for solar gains and reduce shading to window by new parapet wall.

6 2. COMPACT FORM 1. Remove 1 no. window to upstairs studio 2. Move downstairs WC window from North to East facade gain morning sun 3. Move upstairs bathroom window from North to West façade gain evening sun despite neighbouring building

7 2. COMPACT FORM 1. Remove complex junction between pitched roof sections 2. Remove triangular window with difficult head detail 3. Improve westerly solar gain increasing window size to downstairs bath 4. Improve daylight to bedroom 2 and studio as well as solar gains

8 2. COMPACT FORM

9 3. MAXIMISE TREATED FLOOR AREA AVOID DOUBLE HEIGHT VOIDS!

10 3. MAXIMISE TREATED FLOOR AREA

11 3. MAXIMISE TREATED FLOOR AREA

12 4. CERTIFIED HRV SYSTEMS Most HRV systems are developed for Passive House, as most standard house designs don t include this. If a unit is not certified, it is subject to a penalty factor on its efficiency you will have to compensate for this elsewhere! HRV efficiency has a significant effect on annual heat demand for Passive Houses get the highest efficiency you can while correctly sizing the unit. Look for electrical efficiency also, as these have 2 fans running year round!

13 4. CERTIFIED HRV SYSTEMS

14 5. WINDOW OPTIONS There are no penalty factors for using non-phi certified windows All windows are certified in accordance with BS EN ISO &2 Certified windows have U-values of 0.8W/m 2 K or better In many parts of the UK, due to temperate climate conditions, U-values up to 1.1W/m 2 K can provide adequate comfort and thermal performance for certified Passive Houses. Windows are the most expensive item per sq. mtr. in your design choose wisely!

15 6. DESIGN JUNCTIONS CAREFULLY Use standard proprietary products where possible. Develop a flow-chart of junction construction to ensure no conflicts & harmony between trades. Always think of airtightness & insulation continuity ALWAYS! Ensure the detail is completely specified before construction!

16 7. THERMAL BRIDGING Do not ignore thermal bridge assessment in the design development! Good junction design will result in low energy losses and high surface temperatures, but it also strongly affects buildability, closes the performance gap, and ensures robust airtightness continuity.

17 7. THERMAL BRIDGING Typical, outward-facing, junctions have negative psivalues in Passive Houses. Although you may not be required to carry out thermal models for these junctions, inputting negative thermal bridges will reduce heat demand and heat load. These can reduce fabric performance requirements, reducing insulation thicknesses and saving material costs.

18 7. THERMAL BRIDGING Where possible, use certified developed details from catalogues or manufacturers, it could save costly analysis later. Speak to your Passive House Certifier about what their requirements for thermal modelling are. No two certifiers were born the same! You will need to factor this into overall project costs.

19 8. CERTIFIER CHOICE Speak to more than one certifier! Costs for certification can vary, make sure you know what s included. Avail of design-stage assurance where available, it will give you confidence in the design before construction stage.

20 THANK YOU FOR YOUR ATTENTION