Edinburgh's varied geology, from glacial till over the central belt to raised marine deposits along the Forth, demands precise geomembrane specification. The team deploys a truck-mounted inspection pit rig for shallow liner verification, but the core work happens at the lab bench. Geomembrane specification involves selecting the correct polymer type, thickness, and texturing based on site-specific chemical exposure and subgrade conditions. In Edinburgh, where historic fill sites and soft estuarine clays are common, the specification must also account for differential settlement and puncture resistance. Before writing a specification, the team often runs a permeability in the field test to confirm the subgrade's hydraulic conductivity and a plate load test to verify subgrade stiffness under the liner.
Specifying a geomembrane without subgrade verification is like building a foundation without soil testing. Puncture and settlement are the real risks in Edinburgh.
Scope of work in Edinburgh
Typical technical challenges in Edinburgh
Edinburgh sits on the Southern Uplands fault line, a zone of minor but recurring seismic activity. The last felt tremor of magnitude 2.8 occurred in 2018 near Penicuik. While not a high-seismicity region, a geomembrane specification for a landfill or reservoir in Edinburgh must consider differential movement at liner seams during a seismic event. The bigger risk, however, is settlement of the underlying soft clays and peat deposits. A 100-year-old landfill cap on the Water of Leith showed 150 mm of differential settlement over 20 years, causing a 1.5 mm HDPE liner to wrinkle and lose seam integrity. The specification must therefore include a settlement allowance and a textured liner to maintain friction on slopes.
Our services
The lab offers two core geomembrane specification services, each tailored to Edinburgh's ground conditions and project types.
Liner Material Selection & Design
We analyse the project's chemical exposure, subgrade CBR, and settlement tolerance to select the optimal polymer, thickness, and texturing. Includes a written specification with test schedule and seam acceptance criteria.
Subgrade Verification & Installation Support
Our team performs field density tests, plate load tests, and permeability checks on the prepared subgrade before liner deployment. We also provide on-site seam inspection using vacuum box and peel tests during liner installation.
Visual overview
FAQ
What is the typical cost range for a geomembrane specification in Edinburgh?
For a standard landfill cap or reservoir liner specification in Edinburgh, expect a cost range between £520 and £1,270. This includes the site visit, subgrade testing, material selection report, and a final specification document. Larger projects with complex chemical resistance requirements or multiple liner layers fall at the upper end.
How long does it take to prepare a geomembrane specification?
A typical specification takes 5 to 10 working days from the site visit. If subgrade testing (CBR, permeability) is required, add 3 to 5 days for lab results. The final document includes material grades, thickness, seam strength targets, and a quality control plan.
What subgrade conditions in Edinburgh most affect geomembrane selection?
Edinburgh's soft clays and peat deposits pose the biggest challenge. A subgrade CBR below 3% requires a geotextile cushion layer under the geomembrane. Differential settlement of 100 mm or more over the design life demands a thicker liner (2.0 mm or above) and a textured surface on slopes to maintain friction.