MOULD IN BUILDINGS New Plymouth Conference – November 2013 Philip O’Sullivan, Director.
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Transcript of MOULD IN BUILDINGS New Plymouth Conference – November 2013 Philip O’Sullivan, Director.
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MOULD IN BUILDINGS
New Plymouth Conference – November 2013
Philip O’Sullivan, Director
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Typical Buildings Affected
• Residential
• Educational
• Healthcare
• Accommodation
• Offices
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All You Need Is:
Dampness Cellulose
SporesAir
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Cellulose is common in many building products:
• Timber
• Reconstituted wood panels e.g. particle board
• Plasterboard (paper faced)
• Kraft-based building papers e.g. black building paper
• Fibre cement e.g. Hardiflex
• Carpet with jute backing
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And in all types of construction:
• Light timber framed
• Light steel framed
• Reinforced concrete masonry
• Reinforced concrete
• Structural Steel
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Typical causes of dampness
• Leaking roofs
• Leaking walls
• Plumbing leaks
• Air-conditioning – condensate drain leaks
• Subfloor dampness – often poor ventilation
• Flooding
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Reinforced Concrete Masonry
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Inside View
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Steel Framing
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Timber Framing
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Symptoms
• Health issues (Adrienne to discuss)
• Internal evidence of mould in walls – not common
• Most often no obvious symptoms
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Best to obtain information BEFORE remediation commences
• Sample collection - Adrienne to explain
• Prendos prefers air sampling – helpful diagnostic tool
• AVOID removing internal linings - if no choice then cover and seal opening
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Diagnostic Techniques
Example from air sampling in concrete building with light steel framed walls.
Colour coded to mould type and anticipated level of dampness.
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Comparing spore levels with possible levels of dampness
Retaining Wall Leak
Balcony Leaks
Damp subfloor
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Options if high spore levels encountered:
• Eliminate –takes time to remediate
• Isolate – only if parts of building can be closed and sealed off
• Minimise – improve ventilation or use recirculating air filters
• Fixing or preventing the leak, without mould removal, often
leads to increased spore levels.
• Need to undertake on-going air testing if building is to remain
occupied.
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Remediation - localised
• If leak localised then possible to seal off affected area and remediate.
• Need H&S plan
• Provide negative pressure – extract fan to outside
• Provide separate access from outside to prevent contamination
• Check spore levels after decontamination and re-clean if necessary.
• Check again as may have missed some contaminated material.
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Remediation - global• If leakage affecting a substantial part, or all of building then
usually best for occupants to vacate during repairs.
• If mould in external walls then leave lining on, remove cladding and remove other materials while damp.
• If mould from located internally (roof or services leak):
1. Provide negative pressure – extract fan to outside.
2. Remove mould affected material.
3. Check spore levels after decontamination and re-clean if necessary.
4. Recheck as may have missed some contaminated material.
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Severely decayed timber and mould spore levels were very high
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Decayed untreated timber, very limited mould growth.
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Thank You
Any Questions?