Aggregate Industries logo

Mount Vernon Hospital, Hillingdon

« Back to your search results

Mount Vernon Hospital, Hillingdon

  • Print
Drainasphalt at Mount Vernon Hospital site
1 of 1 | Drainasphalt at Mount Vernon Hospital site

Completed in 2009, Drainasphalt surfacing solutions help prevent flood risk at this £13m Mount Vernon Hospital project.

Key facts

Architect: Day & England Stevenson Marsh
Sub contractor: Toppesfield Ltd
Sector: Healthcare
Client: Hillingdon NHS Trust
Contractor: Jarvis Contracting
Engineer: Wilsham Consulting
  • Flood mitigation surfacing solution
  • High quality material meeting specific requirements
  • 4050m2 of porous Drainasphalt car park material supplied
  • Drainasphalt supplied with Bardon Hill aggregates at a PSV of 60
  • Asphalt mixed and delivered at between 160 and 180oC.


Extensive flooding was occurring prior to works downstream of the hospital. The project needed to reduce both total and peak flows. A multi-stage sustainable water treatment system was proposed, combining a number of techniques such as porous asphalt, swales, French drains and attenuation basins. 


The site combined the main boulevard for the hospital and terminal for the London Bus Company with SMA as well as porous asphalt for the large car park.

The final pavement solution was specified as 35mm of 10mm Drainasphalt laid on 80mm of 20mm Open Binder. The solution allowed for the effective drainage of surface water at source and was also suitable for worse case storm water scenarios.

Hillingdon NHS Managers were pleased with the project having provided a leading example of sustainable low impact civil design in the UK. When commenting on the performance of the Drainasphalt used, Hillingdon NHS said, “I don’t know why this is not done everywhere”.

A big benefit of using porous asphalt for the Trust was that it essentially eliminated ponding and therefore slipping hazards around cars.

Customer testimonial

"We worked with Aggregate Industries to fine tune the specification so everyone was happy that the balance between cost and strength had been achieved."

Stephen GibsonWilsham Consulting (


Products and services supplied by us

Mount Vernon Hospital, Hillingdon

  • Print

What are you looking for?

Where to find us?

Please enter your town, city or postcode and the fields that you want to search on (if relevant):

International enquiries >


Read more >