What is the purpose of a DPC at a window or door? - To prevent moisture rising into the wall., What is a Thermal bridge? - A point where heat escapes due to poor insulation., Why do we insulate the window frame? - To prevent Thermal Bridging, What is the purpose of the fireback? - To reflect heat and protect brickwork., What is the function of a flue liner? - To provide a smooth, heat-resistant path for smoke., Why have a hearth? - Fire safety—protects floor from heat & sparks., What is the maximum number of risers in a flight? - 16 risers., What is the pitch of a stair? - The angle of the staircase., What is the going? - Horizontal distance of one step., What is the nosing? - The overhang of the tread over the riser, What is a cut (open) string? - The side of the stairs showing the shape of the risers/treads, What is a closed string? - The treads/risers are hidden within the string, What is the purpose of a valve? - Turn the flow of water ON/OFF, Why must solar panels face south? - To maximise solar energy gain., What does a geothermal system extract heat from? - The ground/earth, Why are ground loops buried deep? - Temperature is stable and warmer underground., What part compresses the refrigerant? - Compressor, What happens when we compress the refrigerant? - It increases the temperature of the refrigerant, What part transfers heat to the heating water? - Heat exchanger, What part releases the pressure causing the temperature to decrease? - Expansion valve, What controls the flow in underfloor heating? - The manifold, What is the difference between foul water and greywater? - Foul water is toilet waste. Greywater is waste from sinks, showers, baths, washing machines., What does a septic tank do? - Seperates solids from liquids (Primary Treatment), What is the purpose of a percolation area? - Secondary treatment using soil bacteria, How often should the septic tank be cleaned? - Every 3 years (Recommended), Why is a bit of waste left after cleaning out a septic tank? - A small amount must stay behind to help restart the natural bacterial process., What does MVHR stand for? - Mechanical Ventilation with Heat Recovery, What is the optimum pitch for a stairs? - 35 degrees. Max. 42, How do we know if soil is suitable for septic tank system? - Percolation test, What does U-Value measure? - Rate of heat loss,

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