No Dig Pipe Repair

We are able to effectively repair damaged, collapsed and disjointed pipes in diameters from 100mm up to 500mm without the need for excavation. Pipes with root intrusion problems can be treated the same way after removal of the roots in the pipes.

The system is quick, clean, and permanent with minimal disruption to traffic, pedestrians and surrounding infrastructure. The repair is made via a convenient manhole and removes the need for costly excavation, traffic management, redirection of pedestrians, road closures etc. Pedestrians and vehicle traffic have free access whilst sewer and drainage pipe repairs are carried out underground. 

First action is for the pipe to be cleaned and any loose debris is removed using high pressure jetting equipment.

Using the same technology as a surgeon placing a stent to repair a collapsed, narrow or weak artery, we use an inflatable packer (special rubber tube) to insert a ‘stent’ which we call a patch, consisting of a dual layer fiberglass mat wetted out or saturated with a silicate resin and rolled around the packer. The patch is inserted into the pipe by accessing from the nearest suitable manhole.

The packer is inflated at the site of the damage expanding the patch into the damaged area. The packer remains inflated, pressurizing the patch against the internal wall of the pipe, until the resin cures (30 -90 minutes.)

The patch will cure under water.

Once the patch has cured (hardened) the packer is deflated and withdrawn.

The resulting chemically resistant ‘patch’ is structurally sound, has minimal effect on the diameter of the pipe, is a permanent repair and the work to place the patch has caused minimal disruption to the surrounding roads / footpaths and infrastructure.

Patches can vary in length between 600mm and 5metres, and there is almost no limit to the distance along the pipe from a manhole that a patch can be installed.

In some instances the packer and patch can be used to join pipes of different diameters or realign disjointed pipes.

The system works on all pipe materials with the exception of PP and PPE materials.


Manhole Repair and Rehabilitation

Manhole Repair and Rehabilitation,

(Applies to wet wells and pump stations and similar structures.)

The UK has a wide range off manhole types, mainly concrete and brick
construction, installed over the years.
Manholes can be found in all type of infrastructure, Sewers and drains, surface
water control, industrial plants of all types, chemical plants, foods processing
plants, breweries, refineries etc. etc.
Older manholes were made from engineering and vitrified brick that have
excellent resistance to chemicals and in particular sulphuric acid, formed from
the H2S gas generated by microbiological activity in sewage. These
bricks were excellent when first used in the construction of manholes.
Unfortunately the sand / cement mortar mix used to bond the
bricks together has poor resistance to H2S (resulting in sulphuric acid) and
chemical attack, the mortar joints are attacked by the chemicals and
the mortar can be significantly reduced in strength and consequently affecting
the bonding of the bricks and the structural integrity of the manhole.
Similarly chemical and H2S attacks on unprotected concrete manholes reacts in
the same way, attacking the cement in the concrete and reducing its strength,
dissolving the bond between the aggregate, sand and cement mix resulting in the
eroding the surface and exposing rebar in some extreme cases.
The symptoms of this type of damage to manholes are displayed as infiltration
issues (through brick joints, concrete ring joints, penetrations) causing
overcharging of the downstream treatment plants, exfiltration leading to
pollution and environmental issues, structural failure, damage or complete
destruction to the concrete benching and pipe connections, wash out of backfill
and surrounding ground subsidence.
We have solutions for all aspects of dealing with manhole, pumps station and
wet well problems.
We visit site, survey and examine the problem, (all our operatives are confined
spaces certified), we will recommend and quote for a solution to the problems
identified that can include;
Leak sealing.
Preparation and cleaning of the manhole surfaces.
Repair of benching, mortar joints, replace missing concrete, repair and restore
and protect re-bar.
Application of protective coating.
Check and sign off and issue guarantee for completed work.

Infiltration and Leak Sealing

We have a range of products and delivery systems capable of effectively dealing with most types of infiltration and exfiltration in any substrate and construction type, providing a waterproof long-term ‘fix’ to the problem.

From the smallest leak to a ‘gusher’ we have the products and expertise to deal with infiltration problems with a rapid response service nationwide.

We have extensive experience of and have successfully dealt with infiltration problems in many situations and across many industries; e.g. sewage treatment plants, manholes and pump stations, chemical plants, food processing plants, breweries, digesters, lift shafts, basements and cellars etc.

We have a wide range of high quality proven materials that can handle any eventuality including single and dual component expanding closed cell hydrophobic polyurethane resins which are injected into the substrate / structure then expand and block off the water flow permanently.

We have polyurethane injection resins that permanently seal cracks, fissures and failed joints in the structure and remain flexible to allow further movement. These dual component, flexible, high strength resins are injected to track along fine cracks and cure to a permanent flexible seal, leaving a sealed substrate ready for coating.

Many manholes, chambers, bunds and pipe systems suffer from infiltration through the cement joints where the cement has perished or been eroded by chemicals or acid produced by the presence of hydrogen sulphide.

This is especially true of the older brick manholes and chambers. In the case of dirty water / sewage systems surface water leaking into the system overcharges the treatment plant with clean water that does not need treating and therefore reduces the capacity of the treatment works and increases the operating costs.

In the case of potable water infiltration can lead to increasing treatment and expense before the required purity standard is reached and the water can be sent to the distribution network.

Contact us today for a no obligation survey.

Waterproofing Leaking Lift Pits and Elevator Pits

Waterproofing Leaking Lift Pits and Elevator Pits

Power Coatings ltd have significant experience and expertise in waterproofing all types of pits, shafts, lift & escalator pits. It doesn’t matter if they are constructed from concrete, brick, concrete blocks or metal lined pits! We can waterproof lift pits that are 100 years old, 50 years old or just 5 weeks old. We have tried and tested, proven solutions for them all.


Why do Lift pits leak?

There can be many reasons why water enters a pit. Usually the reasons are a mixture of the following:

  • The existing waterproofing system has been incorrectly applied or damaged during construction
  • The pit is too old for any effective waterproofing system to have been originally installed
  • Adjacent construction has altered or redirected the local water table
  • A nearby water main has burst or drainage has blocked
  • The time of year (wet weather can increase the water table)How does the water get in?
  • Depending on the type of construction water can enter a lift pit though several ways:
  • If the lift pit is constructed from roughcast concrete (i.e. poured concrete walls in shuttering) there will be a construction or ‘kicker joint’ as it is more commonly known. Water can enter through this weak point.
  • If there are any other cracks or imperfections in the concrete walls or base, water will enter through these areas also.
  • Brickwork can have leaking joints and porous brick.
  • Wall to base construction joints are a regular leaking problem in all types of lift pits.

How do we fix it?

The most common systems we use for existing pits are:

  • Reactive dual component hydrophobic expanding polyurethane grouts.
  • Single component polyurethane expanding grouts.
  • Flexible non-expanding crack sealing resins.
  • Dual component epoxy resin coating.
  • Polyurea coatings.
  • Cement based render & waterproof grout technology, which is an environmentally friendly, fast setting, high early strength concrete repair material that starts to set in 35 minutes.
  • Our specifications usually involve a mixture of systems. This is dependant on the construction and extent of the problem.

Power Coatings ltd waterproofing specifications are designed to form a permanent waterproof seal to the structure and are applied both on the positive (external) and negative (internal) faces of the pit or shaft.

These specialist repairs are carried out without any major disruption or dismantling of the lift mechanism. Ultimately this means less inconvenience, minimal lift down time and cost effective solution for the client.

In what buildings will our products work in?

We install waterproofing systems to lift pits and escalator pits that are of any age. We have repaired and waterproofed buildings from new builds up to buildings of 100 yrs. old.

We carry out lift pit repairs to hotels, large company headquarters, commercial units, factories, schools, hospitals, large houses, sheltered housing schemes and care homes. We also recognise the problems that can be created when working in sensitive environments. We work with our client and our H and S team to ensure that the works we carry out are done so with minimum disruption.


Polyurea is a coating technology/product and has been used very successfull for many different applications all around the world. Polyurea technology is not new, it has been around and in use for almost four decades now but in comparison to many other coating systems it is more advanced than some traditional coating systems and offers a whole array of advantages to the owner/contractor that cannot be achieved with other coating systems.

Polyurea is not a specific coating system by name or specification but it is a polymer technology with a wide range of product formulations that are matched to a particular requirement.

There are not many coating systems that can compare to Polyurea when it comes to attainable physical properties e.g. high elongation, superior tensile strengths, excellent abrasion resistance, high impact resistance, excellent chemical resistance.

Polyurea’s major benefit has to be its fast set and return to service characteristics, Tack free within 10 – 60 Seconds and open to traffic within the hour, returning an area to service many times faster than traditional coatings.

Polyurea needs a primer for porous surfaces e.g. concrete, cement, brick etc.

Polyurea has excellent elongation and is ideal for waterproofing the outside of basements and tanks etc. where resistance to high positive pressure and the ability to accommodate building movement is important to the effectiveness of the waterproofing.

For tanking jobs a Polyurea system is highly puncture and abrasion resistant and ideal where backfill and consolidation is part of the project.

Polyurea is sprayed using plural component spray equipment at +70C.