Structural Waterproofing - Project Profiles:
New superstore for Asda Stores Limited
Preprufe® Waterproofing System (Preprufe® 300R & 160R)
This brownfield location is situated to the east
of Hamilton and immediately adjacent to the M74 motorway linking Glasgow
with the south.
The engineer had been advised by his gas consultant
to use a waterproofing membrane with appropriate gas resistance and a
loose-laid, unbonded system had been incorporated in the drawings. Grace
Servicised® has much previous experience with supermarket schemes
including projects for Asda and Tesco. Because of this, the Hamilton project
architects asked the Company to propose an alternative scheme, based upon
products which would provide both gas resistance and tanking.
Following extensive consultations with the gas consultant,
the engineers, the architect, the quantity surveyor and building control,
a solution was submitted to the architect using Preprufe® 300 Pre-applied
Membrane. Preprufe® 300 is a unique multi-layered HDPE membrane that
forms an integral seal with wet concrete poured against it during the construction
process. The membrane is then sealed to the structure it protects and not
to the substrate.
Preprufe® 300 membrane is particularly suited
for brownfield sites and overcomes many of the problems highlighted in
BRE Report 212 Construction of New Buildings On Gas-contaminated Land.
Preprufe® 300 membrane is very robust and
resists damage on site without additional protection. Its HDPE construction
makes it resistant to the corrosive elements of landfill gas and leachate
and its unique bond with the underside of the slab avoids problems arising
from differential settlement of the subsoil beneath the slab.
Preprufe® 300 membrane is inherently waterproof,
durable and chemically resistant with a methane permeability 40 times
better than typical values for 1200g polyethylene - the BRE recommended