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We established that the
gutter was to blame but also could not rule out the fact that water
could be coming from the header wall directly above the small PVC
gutter visible in the picture above.
The
scope of works was :
- To redo the header
wall flashing directly above the bricked chimney area.
- To seal the roof bolts in the roof area affected.
- To flash between the lower roof section and the upper roof section.
- To redo the waterproofing of the bricked chimney.
- To reline and to widen the valley.
The specifications were to:
Header
Wall flashing: (torch on)
> Strip and remove old and damaged waterproofing systems to the
header wall flashing. Remove all rubble from site.
> Apply a single coat bituminous waterproofing primer.
> Apply a 4mm heat fused torch on waterproofing system to the
previously primed areas allowing for 75mm overlaps, heat sealing
all overlaps.
> Apply a heat/light reflectant silver aluminium paint to protect
underlying waterproofing system against UV rays.
Roof
Bolts
> Remove previous waterproofing around roof bolts.
> Re-secure roof bolts where necessary.
> Seal all roof bolts with a Bituseal Plastic waterproofing agent.
> Apply a heat/light reflectant silver aluminium paint to protect
underlying waterproofing system against UV rays.
Flashing
between the upper IBR flat roof of the house and the lower IBR flat
roof of the extension.
> Strip and remove old and damaged waterproofing system between
the upper IBR roof of the house and the lower IBR flat roof to the
extension.
> To loosen the roof sheets of the upper roof sheets, fixing
a 4mm waterproofing system to the last row of battens in the roof.
> Apply a single coat bituminous waterproofing primer to the
lower IBR roof.
> Apply the 4mm heat fused torch on waterproofing system to the
previously primed areas allowing for 75mm overlaps, heat sealing
all overlaps.
> Apply a heat/light reflectant silver aluminium paint to protect
underlying waterproofing system against UV rays.
> Fix in place the previously removed roof sheets.
Chimney
(torch on)
> Strip and remove old and damaged waterproofing systems around
the chimney, down to a bare underlying substrate. Remove all rubble
from site.
> Conduct a thorough inspection confirming a good bondable substrate.
> Apply a single coat bituminous waterproofing primer to the
substrate and allow solution to flash off.
> Apply a 4mm heat fused torch on waterproofing system to the
previously primed areas, allowing for 75mm overlaps and 150mm upturns,
heat sealing all overlaps.
> Counter flash, where necessary, using a self-adhesive 300mm
wide uniflash waterproofing system.
> Flash off counter flashing using bitu-seal plastic.
> Apply a heat/light reflectant silver aluminium paint to protect
underlying waterproofing system against UV rays.
Valley
Re-lining
> Strip and remove roof sheets adjacent to valley so as to expose
the existing valley.
> Lay a 4mm heat fused torch-on waterproofing system down the
full length of the valley securing the waterproofing system to adjacent
batons using Flathead clout nails.
> Apply a heat/light reflectant silver aluminium paint to protect
underlying waterproofing system against UV rays.
> Place back the previously removed roof sheets.
So we got
underway and opened up the roof and took out the corrugated "gutter".
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