Insulation
These photo’s are showing good and poor installation of insulation. This in no way reflects the quality of the products being used.
Examples of good ceiling insulation
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Poorly installed ceiling insulation
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- Well-installed fibre glass blanket. Covers joists, extends to exterior wall top plate, no gaps.
- Cellulose fibre: covers joists, consistent height, no gaps and allowance for settling.
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- Material probably moved to allow other work in ceiling and not subsequently re-laid.
- Insulation material should be at least 25 mm from roofing.
- Poorly butted segments, gaps, material touching building paper.
- Gaps, large and small. Insufficient clearance from light/fan fitting creates danger of fire.
- Large gaps, folds in material.
- Old material, very thin, obviously been moved and not returned.
- Very thin or non-existent coverage.
- Old very thin material. Probably damp or has had exposure to moisture in the past.
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Examples of good underfloor insulation
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Poorly installed underfloor insulation
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- Material well-stapled but too much sag.
- Well-stapled polyester blanket. Material up against floor and stapled to joists. Moisture barrier well-taped around piles.
- Well installed. Important that 200mm clearance from light fitting maintained.
- Well-stapled polyester blanket. Material up against floor and stapled to joists. Moisture barrier well-taped around piles.
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- Material not supported. Debris left behind.
- Over-size material, inadequately stapled, hanging below floor joists.
- Gap for air movement. Significantly reduces insulation value.
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Indicators of Excessive Moisture Underfloor
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Effects of poorly installed insulation and other hazards
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- Evidence of gaps in ceiling insulation. Also indication of moisture/ventilation issues.
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