Fibre Concentrations From Work With Asbestos Cement.

 

Work on asbestos cement roofs personal exposure to asbestos
Task Range Source
All work on ac roofing and sheets Not detected/<0.01 – 1.1 f/ml (from data below)
Roof Repair  “Representative” Not detected – 0.3 f/ml (CONSAD, 1990)
Roof Removal “Representative” Not detected – 0.2 f/ml (CONSAD, 1990)
Dry – replacing corrugated asbestos cement 0.01 <0.01 f/ml (Roberts, 1985)
Collecting sheets and cleaning 0.24 f/ml (Roberts, 1985)
Removal of corrugated sheets (detachment and sliding to gutter) 0.047 f/ml (Preat, 1993)
Throwing sheets into lorry 0.161 f/ml (Preat, 1993)
Removal of corrugated sheets (detachment, stacking on elevator, placing in pallets) 0.028, 0.038 f/ml (Preat, 1993)
Removal of corrugated sheets (detachment) 0.018 f/ml (Preat, 1993)
Stacking of sheets of pallets  0.032 f/ml (Preat, 1993)
Removal of slates (detached with hammer) 0.064 f/ml (Preat, 1993)
Sliding slates to gutter; throwing to ground 0.195 f/ml (Preat, 1993)
Removal of slates (detachment and stacking) 0.037, 0.044 f/ml (Preat, 1993)
Removal of slates (detachment and placing in container on roof) 0.050, 0.176 f/ml (Preat, 1993)
Removal of slates (pulling off, stacking on elevator, broken slates thrown to ground) 0.100 – 0.122 f/ml (Preat, 1993)
Removal of slates (detachment with hammer, sliding to gutter) 0.068 f/ml (Preat, 1993)
Bringing slates down and throwing into container 0.056 f/ml (Preat, 1993)
Wet (but not effective) Mean 0.020 f/ml (Lange & Thomulka, 2000)
Roof Replacement Dry replacement (severely weathered) – unfastening, removal, stacking, disposal, installation of new roofing 0.03 – 0.24 f/ml (Brown, 1987)
Dry unfastening, removal, disposal, installation of new roofing (no stacking) 0.03, 0.03 f/ml (Brown, 1987)
Dry replacement (severely weathered) 0.04 – 0.27 f/ml (Brown, 1987)
Dry removal (painted) 0.07 – 0.32 f/ml (Brown, 1987)
Wet removal (painted) and replacement (careful handling and wetting as stacked) Not detected – 0.07 f/ml (Brown, 1987)
Replacement (severely weathered) after lignin sulphonate treatment 0.23 f/m (Brown, 1987)
Replacement (severely weathered) after sealing with acrylic resin 0.03 – 0.08 f/ml (Brown, 1987)
Replacement (severely weathered) after sealing with acrylic resin 0.04 – 0.26 f/ml (Brown, 1987)
Roof Removal – Demolition Dry (building collapsed) 0.10 – 0.47 f/ml (Brown, 1987)
Dry (from scissors lift) 0.04 – 0.12 f/ml (Brown, 1987)
Sheets stacked in confined space 0.30 – 0.53 f/ml (Brown, 1987)
Sheets stacked in confined space (accumulated dust under laps and ridges) 0.34 – 1.1 f/ml (Brown, 1987)
Wet 0.05 – 0.06 f/ml (Brown, 1987)
Wet (sheets staked in confined space) 0.10 – 0.13 f/ml (Brown, 1987)
Wet (sheets staked in confined space; accumulated dust under laps and ridges) 0.29 – 0.68 f/ml (Brown, 1987)
Sealed with acrylic resin 0.11 – 0.32 f/ml (Brown, 1987)
Sealed with acrylic resin (sheets stacked in confined space; accumulated dust under laps and ridges) 0.41 – 0.76 f/ml (Brown, 1987)