Structural Renovations have recently secured a leak sealing project within the basement of a residential complex in Central London, using Sika repair products.
The basement has been converted into secure storage, which is being managed by a private company.
A large number of the movement joints within the slabs, which were constructed in the 1970’s, have perished and failed allowing water to percolate through into the storage units causing damage. It was not possible to access the top of the joints, as they have been landscaped.
After preliminary discussions it was agreed that all works would be carried out from within the basement.
The works involve the preparation of the concrete either side of the joints using specialist grinding equipment fitted with dust suppression and collection preventing damage to adjacent areas. Once complete the existing sealant and compressible boarding within the joints is to be removed and the joints cleaned. A new polyethylene backing cord will be installed and the shoulders of the joint are to be primed and sealed using a polyurethane sealant. To further enhance the waterproofing of the joints SikaDur Combiflex, an elastic membrane, is installed fixed with SikaDur 31, a moisture tolerant epoxy resin, across the joints leaving the centre free to move with the structure.
This robust solution can be applied in vertical joints, tops of decks (assuming it will be buried) and overhead.