GUIDELINE

Site Preparation

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 26 Inspection of Windows on Rainwater System No 2. Inspection Foundations Radon Sump Barrier and Blinding No 11. Inspection of Block work, Brickwork and feature stone band No 12. Inspection of Block work, gable and party walls. No 2. Inspection Foundations Radon Sump Barrier and Blinding No 3. Inspection Radon Barrier Blinding and Insulation No 22 Inspection Steel Beams and Intumescent paint No 28. Inspection of timber stairs installation No 4. Inspection of Radon Barrier and DPC No 5. Inspection Radon Barrier Rising Walls Block and Brickwork No 25 Inspection of Windows on Front Elevations, DPM and Control Joint No 8. Inspection of Blockwork and elements No 17. Inspection of Stud wall construction No 23 Inspection of windows and doors being installed No 14 Inspection of Structural Beams No 19. Inspection of Roof Construction and breathable membrane No 21 Inspection of Electrical first fix No 10. Inspection of Joisting , bridging, Block work, Brickwork and Lintel supports No 27 Inspection of Windows on Velux Rooflights No 7. Inspection of Rising walls, Damp proof Course and Blockwork. No 16. Inspection of Stud wall construction. 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

Site Preparation

Share

Prior to commencing with the construction of a dwelling/dwelling houses it is imperative to ensure that the ground on which you are to build is suitable. Organic material and excessive moisture/water should be removed in so far as is possible and should there be any remnants they should be adequately addressed at the design stage. The following guidance is suitable for application with respect to non-complex dwellings using ordinary design and construction methods.

Site Drainage

If the site in question is subject to flooding, you should reconsider building on this site. However, should you wish to proceed you should employ the services of a suitable qualified environmental engineer to determine how best to proceed.

The following guidance is based on the assumption that the site in question is not subject to flooding. Drainage of the site should be undertaken where:

  • The water table can rise to within 250mm of the lowest floor level of the dwelling, or;

  • Where the ground water on the site would likely adversely affect the stability of the structure.

Where the above is a concern the site should be drained by gravity or other suitable means of safeguarding the building should be implemented.

Some good indicators of whether the water table on your site is high are:

  • The site in question is surrounded by areas of higher ground.

  • The ground remains damp even in dry weather.

  • Vegetation associated with damp ground are present on the site.

Dwellings should be constructed in such a way that surface water on the site should not be able to cause damage to the building and should not be able to enter the dwelling(s).

Subsoil Drainage

During excavation if an active subsoil drain is cut the following steps should be adhered to:

  • Where the subsoil drain is to pass through the building it should be re-laid in pipes having sealed joints with access points to be provided outside the building.

  • It should be diverted to an alternative outfall.

  • It should be diverted so as to run around the building as opposed to under it.

Part C of the Building Regulations relates to Site Preparation and the Resistance to Moisture and Technical Guidance Document C provides guidance on subsoil drains, see extracts below. Diagram 2 of Technical Guidance Document C demonstrates how a new subsoil drain should be provided, if required.

Diagram HC1 - Subsoil drain cut during excavation- Extract from TGD C

Diagram HC1 - Subsoil drain cut during excavation- Extract from TGD C

Diagram HC2 - Protection against ground moisture - Extract from TGD C

Diagram HC2 - Protection against ground moisture - Extract from TGD C

Organic Material

Any vegetation or turf on the site should be removed from the ground which the dwelling(s) are to be constructed. The removal from site should be to a sufficient depth that will remove all roots etc. and prevent further growth.

A site containing material that is easily compressible or tree roots poses a threat to the stability of the building and this should be considered at the design stage. Building services should be designed to either resist or accommodated and should be sufficiently strong or flexible to reflect the specific design choice. Tree roots should not be able to penetrate joints.

Further Guidance on Ground Water

Further guidance for the protection of buildings from ground water damage/ingress is contained within the following documents:

  • CP 102: 1973 – Code of practice for protection of buildings against water from the ground.

  • BS 8102: 2009 – Code of practice for protection of buildings against water from the ground – this document replaces elements of CP 102: 1973.

  • BS 8215: 1991 – Code of practice for the design and installation of damp proof courses in masonry construction.

  • I.S. EN 752: 2017 Drain and sewer systems outside buildings - sewer system management.

Shop Screws