Water tight concrete for lift installation in a hotel




Premier Inn Hotels


Carter Lauren

Location type



November 2016

The challenge

The Abergavenny Premier Inn hotel formed part of the expansion of the Whitbread owned chain in 2015. The hotel is similar in construction to many others and had plans for a lift to be installed in the building. Building techniques and design called for a solution to waterproof the basement to stop the ingress of water whether from the water table, storm water leakage, water main burst or leakage. Lift pits can be subject to hydrostatic pressure and traditional methods for lift pit waterproofing systems utilize some form of tanking. The original design had the objective of effectively cocooning the lift pit in a waterproof membrane and thus prevent ground water ingress. However, they are usually small with the need to be externally tanked in difficult, wet and confined working conditions.

Our solution

Tarmac’s TOPPROOF concrete had been used successfully in the past by Carter Lauren on similar projects for Premier Inns, so they proposed its use on the Abergavenny project. The pit was constructed in 2 pours: 12m3 on 1st Dec and 6m3 7 days later. TOPPROOF waterproof concrete contains two specially formulated admixtures. The first reduces the water/cement ratio, increasing the density of the mix and minimising the size of the pores. The second fills the remaining pores ensuring a completely watertight finish. This means there is no need for external membranes, reducing cost and labour.

Results and benefits

TOPPROOF eliminates the need for oil based chemicals and synthetic materials, greatly reduces waste on site, cuts vehicle movements and is 100% recyclable. TOPPROOF is laid in exactly the same way as ordinary concrete so no special skills or equipment are required. Should you require any help all you have to do is ask, Tarmac offers full training and professional on-site support.

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Additional info

Low porosity

TopProof waterproof concrete has a very low porosity for reduced permeability to water and water vapour. 

High performance 

TopProof waterproof concrete effectively seals water in or out as part of a fully watertight system. 

Consistency and control

Admixtures introduced during production for guaranteed consistency and control.

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