Structural waterproofing is the general term for waterproofing any structure. However, we use it when referring to structures such as service tunnels, lift pits, podium decks, or concrete balconies (usually for commercial clients). If you are specifically looking at waterproofing an existing or new-build basement, look at our Basement waterproofing page.
RTC have extensive experience in the treatment of concrete and masonry structures against both water ingress and to create water retaining structures, such as swimming pools and storage tanks. Sometimes, waterproofing is combined with corrosion protection of steel reinforcement. More information on this type of application can be found on our concrete repairs page.
We have access to a vast range of specialist waterproofing and repair products from some of the worlds leading manufacturers such as Vandex and Koster and have received product specific training in the UK and Switzerland.
Below is an example of an interesting project. A large 5m x 6m x 5m deep concrete ‘bunker’ was built into the hillside which needed specialist multi-layer waterproofing (and a green roof for camouflage). It was home to a rather large generator which powered the under-drive heating!
As with all types of specialist waterproofing, correct diagnosis of the problem and designing the right specification for treatment are essential for an effective solution. Both partners are qualified Structural Waterproofing Surveyors (CSSW), and we have experience of a wide range of unique and sometimes challenging projects.
Previous clients have ranged from Muller Wiseman Dairies, where we treated a 2 million litre effluent treatment tank to a new ‘state of the art’ RSPCA animal centre, where we ensured the new canine wash facilities kept the water in, whilst man’s best friend was treated to a good scrub.
It is usually preferable to discuss waterproofing before a structure is constructed. So, if you are planning a project, we would be happy to advise on waterproofing considerations as part of the overall design.
Waterproofing types
It might be important for you to learn about the different types of waterproofing services available and how they could potentially protect your property from water ingress and damage.
Type A: barrier protection
A barrier to water ingress that is applied to the internal or external surface of the structure e.g. a slurry or sheet material.
Type B: structurally integral protections
The structure is formed using watertight concrete (WTC) and this therefore provides the primary form of defence against water ingress. Usually this would also include swellable water bars or other methods of sealing any joints.
Type C: drained protection
Typically cavity drainage membranes are applied to walls and floor together with perimeter drainage channels which divert any water to an automated sump and pump system or to a convenient low-level subterranean drain if one is available. Depending on the structure and ground conditions a centralised modular drainage system can used instead which operates in the same way but is located under the floor slab rather than around the perimeter.
Type C is the most reliable form of waterproofing and is usually the preferred method for refurbishment of existing basements or as part of a combined system for a new build property. As the system is installed from the inside it is more accessible and therefore can be repaired and maintained much more easily than an external system which would normally be buried under ground.
The 3 parts that form a ‘Type C’ drained protection:
Cavity drainage membrane
A crucial part of the waterproofing process is the selection of the correct cavity drain membranes. Cavity drain membrane provides an alternative way of waterproofing walls to the traditional cementitious tanking systems.
Perimeter drainage channel
This drainage system is engineered specifically to solve basement water problems effectively without the worry of clogging from soils under the floor. It has large holes in the back to accept water and a flange with special segments.
Sumps & pumps
The sump & pump system is the heart of a Type C waterproofing system. Water enters the sump via the drainage channel before being pumped away to a convenient drainage point.
For any queries on structural waterproofing solutions, or to book a survey, please contact us.
Our staff will work closely with you from survey stage, right through to the successful completion of the contract.
