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Description

World War II
N London Construction.co.uk.Ltd have just finished bringing WORLD WAR II bunker back to life and refurbished to BS 8102:2009 and NHBC NF4 code of practice after 70 years,
The bunker was built as part to the Water Board Laboratory Building in Clerkenwell ,London EC1R.
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This was the state of the World War II bunker

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And now this ultra-modern underground World War II bunker with an area size of 1076sqm is now part of everyday modern living .

Technical data:

When we took on the project we had various obstacles to overcome:

Height restrictions
Client lead project
Hydrostatic Water penetration from the ceiling and walls
Underground water table

The first initial thoughts was to use a cavity wall membrane with underground sump pumps , which we have done on many occasions, however due to client lead restrictions on costs and time and sensitivity of the building being in a conservation area this was not possible.

We then looked at various liquid applied membranes, whilst there are many manufacturers offering a multitude of products we needed to come up with a cost effective and quick and easy method to make this old World War II bunker water tight and habitable to modern day standards.

We first stripped the bunker from all pipes and cable and fittings attached to the walls and ceiling, removing defective and loose render, preparing brickwork and plugging holes with no shrinkable compounds. Then we applied our liquid membrane to all walls, ceiling and floor.  The floor was then covered with a screen and the whole area was painted .

Unfortunately, we had a problem in the ceiling, the stop plug we used to fill two of the cracks did not last for long, whilst it reduced the amount of water it did not cure the problem.

This was indeed a problem for us and the client.

So we began to try and find other methods of sealing and waterproofing, our client came up with a solution which we did not think about ourselves which was a method used in commercial applications and underground tunnels below sea and rivers.

So we looked into various methods, again different approaches, some using bituminous liquid membranes and other with high pressure aqua reacting solution. We needed a solution which would be permanent, fast and cost effective.

BS 8102: 2009, the code of practice for the protection of below ground structures from water from the ground, defines three types of waterproofing system - Type A, Type B and Type C.  Any of these, or a combination of two or more systems, may be specified in a structural waterproofing project.

Structural leak sealing using cement, polyurethane and acrylic based injection grouts.
Pressure pointing of masonry arches, bridges, culverts and retaining wall structures using cement and lime based materials.
Structural and non-structural concrete repairs using cementitious and resin based concrete repair materials.
Small volume specialist pressure grouting using cement and resin based grout formulations.

Description
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