Hatfield Tunnel with Sealoflex

Hatfield Tunnel carries a huge volume of traffic daily and as a result ventilation of the tunnel is of huge importance.
Liquid waterproofing
Hatfield Tunnel Hero image

The Project

Hatfield Tunnel carries the A1(M) for a distance of 1,200 metres and is in the list of top 10 longest road tunnels in the UK. It carries a huge volume of traffic daily and as a result ventilation of the tunnel is of huge importance. The equipment responsible for this task includes air conditioning, mechanical and electrical plants and– is housed in three plant rooms, one at the south end of the tunnel, one in the middle and one at the north end.

  • Project name: Hatfield Tunnel

  • Contractor:  Itech Roofworks Ltd

  • Solution: BMI Icopal Thermazone and Sealoflex

Testimonials

The System’s Success

“Each phase of the project was delivered on time and on budget. The full BMI Sealoflex Prima System was employed to produce a quality outcome”

Itech Roofworks (Contractor)

Hatfield Tunnel Syndicate 1

Flaw-free Finish

“At all stages the Itech Roofworks team followed the manufacturer’s instructions to ensure a seamless install and flaw-free finish.”

Itech Roofworks (Contractor)

Hatfield Tunnel Syndicate 2

The Challenge

The Challenge

Previous failures including power cuts had caused massive disruption to the traffic on both carriageways and a rethink of how essential services could be delivered to the tunnel, this saw the demolition and reconfiguration of central risers, extracts and tunnel services. 

Each of the three flat roofs posed their own challenges but common amongst them was the need to address the complexities posed by the upstands, vents and hatches that are typical features of a plant room. Making these waterproofs involved highly detailed and intricate work on both the vertical and horizontal plane.

The roofs also featured very slim gullies and any works had to make sure that the narrow apertures of the gullies were not closed up or blocked by extraneous material. Overflows were deemed necessary and installed to each roof.



Hatfield Tunnel Challenge Image

The Solution

The Solution

The three roofs were stripped back to the concrete deck and prepared for the installation of a new warm roof system. Once the primer had been applied to the deck, a vapour control layer was installed and overlaid with insulation and the Pyrobar carrier membrane. 

The full BMI Sealoflex Prima System was then employed to produce a quality outcome. At all stages the Itech Roofworks team followed the manufacturer’s instructions to ensure a seamless install and flaw-free finish. The project required  diligent, methodical and careful work to ensure that the highest quality of installation was achieved. As a result of such outstanding  workmanship we provided the contractor with an extended guarantee of up to  25-year’s, such was our confidence in the project.

Hatfield Tunnel Solution Image

The Impact

The Impact

In order for all three roofs to be guaranteed, our technical specification team regularly checked on the workmanship and reviewed the final installations. To make sure that workmanship met the highest standards, a quality manager wrote daily reports, and inspected all aspects of the installation. Each phase of the project was delivered on time and on budget.

Hatfield Tunnel Impact Image

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