We have had a tanking project done by Timberwise on our basement which is tanked. All initially appeared professional although they did spill something on our carpet during the process which caused a huge stain which couldn't be removed. Despite initially claiming it was water, they refunded me £60 for the ruined carpet. A few months after the waterproof render was applied the plaster blew badly, and we had to pay for a surveyor (employed by Timberwise) to come and give an opinion as to whether or not this was covered by guarantee. This cost £180. As I expected, his opinion was that this work was not due to the poor workmanship of Timberwise, and came up with lots of excuses as to why. Please don't use this company, as you will loose a lot of money when things go wrong.