Basement waterproofing can take place as a building is constructed or, once it is finished and occupied. The above video is an example of what can go wrong when basement waterproofing is not designed correctly and workmanship defects lead to flooding . It also illustrates one of the ways we can step in and help, when water is already entering a basement.
Basement waterproofing Yorkshire homes and structures is one of our specialities and we do this for new and old houses. The last thing we want though, is to be called to a house where the basement waterproofing has already been done by others and has failed.
The above video was shot on a house near Halifix, in Yorkshire, at the foot of the Pennine hills. The house is very new, having been constructed by the owner, with the help of his building contractor. This area is on a steep incline so the house is half-built into the hillside. There are streams and gullies all around the house and this area has it’s fair share of rain and wind. The contractor designed and installed waterproofing as work was done. Unfortunately, within weeks of the waterproofing being relied on – it failed.
The video is fairly self-explanatory, however if you need few more details how we go about basement waterproofing Yorkshire projects, please read-on, or call us on Leeds 265 2752 York 566577 or Sheffield 224 5121 or email us via our contact page
The site was flooded as ground water came into the ground bearing walls and floors. This brought work to a halt, as the lower level rooms were like a paddling pool.
The owner called in Brick-Tie Preservation (via our specialist section – Deepshield waterproofing solutions). Bryan Hindle CSSW was asked to take a look and see what could be done to help. He found that the waterproofing was an external envelope of bitumen based self-adhesive sheets. These had been applied as the work proceeded, both to the concrete retaining walls and the masonry units above that, right up to ground level. Inspecting these was impossible without extensive digging out, but clearly water was coming in somewhere. It was impossible to know where the defect or defects in the waterproofing were. This is because once water gets into the structure, it can spread a long way. The internally visible point of ingress, may be well away from the external entry point.
Bryan took into consideration the site topography, levels of water ingress, type of construction, the ground conditions and the need to comply with the British Standard for this type of work. BS8102 is the standard, which defines best practice for basement waterproofing Yorkshire and UK houses.
After a survey and desktop exercise, Bryan prepared a new basement waterproofing specification for the house. The work would involved installation of a type C cavity drain membrane system using Oldroyd XV and XP membranes for the floors and walls. This had several advantages over other methods in this case.
The cavity drain system relies on management of water ingress. This was done by installing Safeguard Aquadrains in the floor slab, directly connected to 2 separate Sentry sump systems. These included twin pump battery back up, so that the risk of failure is minimised. Any water entering the drainage system is received in the sumps and pumped away harmlessly. In this case the system takes a few litres of water per hour during heavy rain. The pumps have a combined pumping capacity of several hundred litres PER MINUTE! This leaves a wide safety margin – very good practice.
The existing concrete was sealed with a anti-calcium fluid (Vandex Mineralit) and of course all of the drainage runs and the sumps are accessible for regular inspection and cleaning – a must if the waterproofing is to last as planned. BS8102 demands that these systems are ‘maintainable’ so this was designed-in from the start. Follow this link for commercial basement waterproofing.
Bryan decided to have a short film of this project made. This is to help you understand the way Type C basement waterproofing systems work. The above film is short and only covers the essential points. If you have any further questions about basement waterproofing Yorkshire houses, call us for more friendly and expert advice Leeds 265 2752 York 566577 or Sheffield 224 5121 or email us via our contact page