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Building Wrap And moisture control

Building Wrap And moisture control. By Angus Robertson. Building wrap allows water vapour ( invisible steam) to pass through but does not allow water to pass through. This prevents the build-up of moisture inside the house that can cause mould and health problems for the occupants.

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Building Wrap And moisture control

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  1. Building WrapAnd moisture control By Angus Robertson

  2. Building wrap allows water vapour ( invisible steam) to pass through but does not allow water to pass through. This prevents the build-up of moisture inside the house that can cause mould and health problems for the occupants. Moisture is created inside the house by people breathing and cooking as well as clothes drying or gas cooking and heating appliances.

  3. What is Building wrap? It is a building paper, synthetic wrap or sheathing used as part of the wall cladding system to control the movement of moisture by ensuring that moisture that occasionally penetrates the building is directed back to the outside of the building. Another name for building wrap is wall underlay. The product may be synthetic ( this is the type we use on the Unitec house) paper or rigid such as plywood or fibre cement.

  4. Polythene will not allow moisture vapour tor escape from the building. http://www.branz.co.nz

  5. Building wrap will allow moisture vapour tor escape from the building. http://www.branz.co.nz

  6. Household Activity                               Average moisture added to the indoor air Cooking                                                                                                   3.0 litres day Clothes washing                                                                               500 ml per dayShowers and baths                                                   1.5 litres per day per personDishes                                                                                                1.0 litre per dayClothes drying (unvented)                                                           5.0 litres per loadGas heater (unflued)                                                                      1.0 litre per hour Breathing                                                                       200ml per hour per personPot plants                                                                        As much as you give them http://www.wanz.org.nz

  7. The manufacturer tells us how to use their product and we must follow their advice if we want them to honour any guarantees that are made with the product. For Example- The building wrap must be run horizontally. Horizontal laps must be at least 75mm wide. End laps must be 150mm wide. Holes in the wrap must be repaired by lapping the damaged area by 150mm or by taping or both.

  8. Mould and damage to paint and wallboard caused by high moisture content in room

  9. Mould also causes health risks

  10. Flexible Flashing Systems

  11. Flexible Flashing Systems Flexible flashing systems are designed to prevent air leakage and water penetration around window and door openings at framing junctions.

  12. This is the area that the Flexible Flashing tape will prevent rot in.

  13. The manufacturer tells us how to use their product and we must follow their advice if we want them to honour any guarantees that are made with the product. For Example- The Aluband flexible flashing system must not be installed at temperatures of less than 10° If the Aluband is exposed to weather or UV light for more than 90 days it must be replaced. Any laps must be at least 100mm/

  14. References http://www.branz.co.nz http://www.wanz.org.nz

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