GUIDELINE

Appendix B - Assessing Air Permeability of older dwellings in relation to permanent ventilation requirements

Part D Materials and Workmanship

Part F Ventilation

Acceptable Construction Details

Acceptable Construction Details Introduction Thermal Bridging and Airtightness

Insulation in Cavity

• Diagram H ACD - 30 Ope split Lintels Ste... • Diagram H ACD - 12 Concrete Intermediate... • Diagram H ACD - 39 Concrete Forward cill... • Diagram H ACD - 38 Concrete backward cil... • Diagram H ACD - 19 Eaves Unventilated At... • Diagram H ACD - 40 Eaves Wall head close... • Diagram H ACD - 29 Flat roof parapet - I... • Diagram H ACD - 9 Insulation below groun... • Diagram H ACD - 33 Prestressed Concrete ... • Diagram H ACD - 22 Eaves Insulation betw... • Diagram H ACD - 15 Timber separating flo... • Diagram H ACD - 17 Masonry Partition Wal... • Diagram H ACD - 18 Stud partition wall -... • Diagram H ACD - 7 Insulation above groun... • Diagram H ACD - 21 Eaves Insulation betw... • Diagram H ACD - 14 Timber Intermediate f... • Diagram H ACD - 27 Gable Insulation betw... • Diagram H ACD - 26 Gable Insulation betw... • Diagram H ACD - 11 Timber suspended grou... • Diagram H ACD - 23 Eaves Insulation betw... • Diagram H ACD - 32 Ope Perforated Steel ... • Diagram H ACD - 20 Eaves Ventilated Atti... • Diagram H ACD - 34 Ope Jamb with closer ... • Diagram H ACD - 29 Flat roof Eaves - Ins... • Diagram H ACD - 8 Insulation above grou... • Diagram H ACD - 13 Concrete Intermediate... • Diagram H ACD - 28 Gable Insulation betw... • Diagram H ACD - 35 Ope Jamb with proprie... • Diagram H ACD - 36 Corner Inverted Corne... • Diagram H ACD - 16 Masonry solid and cav... • Diagram H ACD - 25 Eaves Insulation betw... • Diagram H ACD - 10 Insulation below grou... • Diagram H ACD - 37 Galvanised Top steel ...

Irish Water Requirements for Dwellings

Typical Inspection Reports

No 2. Inspection Foundations Radon Sump Barrier and Blinding No 26 Inspection of Windows on Rainwater System No 11. Inspection of Block work, Brickwork and feature stone band No 2. Inspection Foundations Radon Sump Barrier and Blinding No 12. Inspection of Block work, gable and party walls. No 28. Inspection of timber stairs installation No 3. Inspection Radon Barrier Blinding and Insulation No 22 Inspection Steel Beams and Intumescent paint No 4. Inspection of Radon Barrier and DPC No 25 Inspection of Windows on Front Elevations, DPM and Control Joint No 5. Inspection Radon Barrier Rising Walls Block and Brickwork No 17. Inspection of Stud wall construction No 8. Inspection of Blockwork and elements No 14 Inspection of Structural Beams No 23 Inspection of windows and doors being installed No 21 Inspection of Electrical first fix No 19. Inspection of Roof Construction and breathable membrane No 27 Inspection of Windows on Velux Rooflights No 10. Inspection of Joisting , bridging, Block work, Brickwork and Lintel supports No 16. Inspection of Stud wall construction. No 7. Inspection of Rising walls, Damp proof Course and Blockwork. No 18. Inspection of Roof Construction. No 7. Inspection of Chasing Block work, Brickwork and feature stone band No 6. Inspection Rising Walls Block and Brickwork No 8. Inspection of Radon Barrier and Damp proof Course. No 30 Inspection of timber stairs handrail installation No 15. Inspection of Stud wall and floor joist construction No 29. Inspection of timber stairs and handrail during construction stages No 3. Inspection Radon Barrier Blinding and Insulation No 31. Inspection of Timber stairs handrail. No 32. Inspection of Roof Access Hatch No 24 Inspection of Windows on Front and Rear Elevations No 20. Inspection of chasing in block party walls for electrical first fix No 13. Inspection Brickwork and Firestopping No 9. Inspection of Brick and Block work from 1st to 2nd floor

Appendix B - Assessing Air Permeability of older dwellings in relation to permanent ventilation requirements

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General Guidance

The minimum requirements for permanent ventilation for certain appliances depend on knowledge of the air tightness of the dwelling where they are to be installed. Dwellings built after 2008 are likely to have evidence of the air tightness either through an individual air permeability test certificate or through representative testing of the same design of dwelling on the same housing development.

Retrofitting measures that would reduce air permeability

Older houses are unlikely to have been tested but are unlikely to achieve an air permeability of less than 5.0 m³ / (hr.m²) at 50 Pa unless the building fabric has been upgraded. These would include all or most of the following measures:

  • Full double (or triple) glazing;

  • Secondary glazing fitted;

  • Effective closures on trickle vents and other controllable ventilation devices;

  • All external doors with integral draught seals and letter box seals;

  • Internal and external sealing around doors and window frames;

  • Filled cavity or solid walls;

  • External insulation fitted;

  • Internal insulation plastered or with airtightness membrane fitted;

  • Impermeable overlay and edge sealing of suspended ground floors;

  • Careful sealing at junctions between building elements such as between walls and floors or ceilings;

  • Careful sealing around loft hatch;

  • Careful sealing around chimney or flue penetrations;

  • Careful sealing around internal soil pipe;

  • Careful sealing around domestic water and heating pipes passing into externally ventilated spaces;

  • Careful sealing of all service penetrations in the building fabric (electricity, gas, water, drainage, phone, TV aerial, etc.);

  • Internal warning pipe for WC;

  • All cable channels for light switches and power sockets sealed;

  • All cable entry for lighting and ceiling roses sealed. Recessed lighting should not penetrate ceilings below attic spaces.

Failure to implement even a few of these measures will typically mean that the overall air permeability will probably exceed 5.0 m³ / (hr.m²) at 50 Pa. However individual rooms in some older houses with solid walls and solid floors can be inherently air-tight when fitted with modern glazing.

The situation may therefore need to be assessed with respect both to the overall dwelling and to the individual room where the appliance is to be fitted. If in doubt then assume that the air permeability is lower than 5.0 m³ / (hr.m²) at 50 Pa and fit the
appropriate permanent ventilation or seek specialist advice.

Further information on sources of air leakage can be found in GPG224 Improving airtightness in dwellings.

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