Structural Air Tightness

Ventilation: Structural air tightness
Guidance on re-use of data for Ventilation - Structural Air Tightness can be found here
Data Entry Item	Guidance	Documentary Evidence
Pressure Test (a.k.a. permeability test)	Clear copy of pressure test certificate (with legible text) with: Air tightness test result; Relevant test standard; Address of dwelling, and Date of pressure test; Test data must be from an individual or organisation with relevant accreditation, for example: List of NSAI Certified Air Tightness Testers List of INAB accredited laboratories; the INAB Schedule of Accreditation should list "Building Air Leakage Permeability test" or alternatively, INAB can be contacted to confirm accreditation. For New Buildings in scope of TGD L 2019 or later, an air permeability test must be carried out on ALL new dwellings. For New Building in scope of TGD L earlier than 2019, development/ site drawings must be provided showing the dwellings tested in compliance with Part L and dwellings not tested where backstop applies. Alterations to the dwelling envelope subsequent to pressure test render that test certificate invalid.	Copy of pressure test certificate for dwelling When the use of a backstop value applies according to the applicable TGD L, copy of pressure test certificates within development and copy of development plan showing dwellings tested
Structure type	Photographic evidence may be provided to show structure type. Where the wall type is unknown, assume the structure type is masonry. Detail from dwelling plans and/or specifications may also be used in determining the structure type.	Photographic evidence showing structure type where available; and/or, Plans/specifications indicating structure type.
Solid/suspended ground floors	Floor types must be clearly recorded on the sketch plan and/or survey form. For suspended floors, assume unsealed unless it can be proven otherwise. Photograph of underfloor vents on dwelling facades may demonstrate suspended timber floor Where more than one type of ground floor is present, the sketch plan / drawings must clearly identify dimensions and the locations of the different types, e.g., suspended floor to living room, remainder solid.	Sketch/architectural drawings with dimensions (if appropriate); Survey form; Photographs of underfloor vents on facades where applicable.
Attic hatches and draught stripping	Record presence of attic hatches and detail of whether they are draught stripped. Attic hatches include crawl space access doors through knee walls for Room in Roof constructions.	Photos of attic hatch draught-stripping Sketch / drawings showing location of attic hatches and record of draught stripping status and/or Survey form record
Sheltered sides	Follow DEAP guidance here, when determining the number of sheltered sides. Sheltered sides must be shown on sketches/ architectural drawings (indicating distance, height and width of sheltering objects and adjacent properties). Photographs can be used in support of the above.	Sketch/drawings/ satellite image depicting aerial view of dwelling showing sheltered sides and relevant parameters Photographs (optional)

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