Structural Renovations Limited have recently completed concrete repair and coating works to the underside of a reinforced concrete slab over the car parking area of a large residential block of apartments, in Eastbourne.
The development, constructed in the late 1980’s, sits on columns above ground level and provides covered parking for the residents, as well as protection from flooding, as the beach/sea is only approximately 50m from the block.
Although the block is well maintained the exposed concrete ‘waffle’ slab, which forms the ground floor has never received any treatment and due to the aggressive marine environment, it had begun to deteriorate, with cracks and spalls forming in numerous locations.
The underside of the slab was surveyed by an independent testing company, to identify the extent of damage and propose suitable remedial action, which would protect the structure.
We secured the contract through competitive tender and provided a fixed price, lump sum to carry out repairs to existing defects, combined with preparing and coating the entire slab with a pigmented, anti-carbonation coating.
It was agreed that the works would be carried out in four phases, as our Client wished for the car park to remain live throughout the works and this was achieved by systematically screening off the working areas, to prevent damage to the adjacent parked cars, whilst allowing them to move freely in and out of the car park.
The works were completed to the agreed financial budget and approved contract programme period.
Structural Renovations were instructed during the COVID-19 Lockdown to commence on site as soon as it was deemed safe to do so.
Prior to mobilising it was essential for the Company to have procedures in place to mitigate the spread of the virus between site workers, residents of the building and the general public. All operations to be carried out were risk assessed and control measures developed, such as increased PPE, staggered break times and regular sanitising of plant.
All individuals involved with the project received a site-specific induction regarding the actual works and separate Tool-Box Talk regarding the ongoing COVID-19 pandemic.
The works at Sheldon House, a 1960s, 7 storey, purpose built block of flats involved the removal of brick slips at each floor level to expose the reinforced concrete slab edges. The condition of the slab edges could then be assessed and a greater understanding of the building’s construction could be established.
Structural repairs were completed, including the installation of new stainless steel reinforcement and a migrating corrosion inhibitor; applied to pacify any ongoing corrosion within the existing reinforcement.
The repaired slab edges were then ‘built-out’ to the face of the brickwork using a structural, polymer modified mortar and once sufficiently cured these were primed and received two coats of pigmented anti-carbonation coating.
In addition cracks within the brickwork were repaired using Helifix approved repair systems.
All works were completed from temporary electric cradles, which provided a safe, suitable and economical method of accessing this type of repair project.
Following the easing of the COVID-19 lockdown, Structural Renovations Limted mobilised at the world-famous theatre for two separate projects; one in the basement and one on the roof.
Prior to commencing on site we developed various procedures that would create a safe working environment for our operatives and theatre staff – the theatre remains closed to the public at this time.
The basement works involved waterproofing the beer cellar, which is situated in a vault beneath the pavement. The vault had already been waterproofed previously but the system had failed and significant amount water was entering the area.
All existing render was removed, to expose the brickwork and localised repairs were completed. Following this a waterproof bandage was installed and all junctions between walls and floor, followed by the application of a polymer modified, cementitious waterproof render. Once cured the render is able to be decorated.
The works above the stage roof required us to apply a fibreglass reinforced polyurethane coating to the rear of a brick parapet wall. The Theatre had experienced significant amounts of water entering the building and temporary repairs had failed to solve the problem.
The wall was thoroughly cleaned and any missing pointing/cracked bricks were made good with polyurethane mastic. Following this an application liquid applied, polyurethane membrane was applied to the wall and whilst wet, fibreglass was firmly embedded. A top-coat of polyurethane membrane was applied to fully encapsulate the fibreglass and form an effective barrier against the elements.
Structural Renovations have recently completed the external refurbishment of Huttons Hotel on Belgrave Road in London, SE1.
Huttons Hotel is converted from Victorian town houses and is situated approximately 1 mile from Buckingham Palace.
The building was thoroughly cleaned and loose coatings were removed. Following this a detailed visual survey and hammer test was undertaken to establish the extent of defective render and concrete.
Traditional render repairs were then carried out and the decorative details such as cornices and window surrounds were reformed using Flexcrete Monolite.
A decorative filler was applied to the facades to provide a level surface which was then over coated with Flexcrete Monodex Ultra.
To further enhance the life expectancy of the building the high level cornice was waterproofed with Sikalastic 625 and the junction between the window frames & reveals were resealed using Sika Hyflex 250 facade.
Structural Renovations have been awarded the contract by The City of London Corporation to verify the condition of the concrete on 10 residential blocks of flats in the Southwark, Southeast London.
The ages of the various blocks range between 65 and 90 years and are therefore some of the oldest flats in the area.
Although all the blocks appear to be predominantly constructed from brick, they do in fact contain significant quantities of reinforced concrete, in the form of public and private balcony supporting slabs, window surrounds, roof overhangs and lintels.
Our brief is to establish whether cast-in chlorides, combined with carbonation attack over time, has affected the condition of the buried reinforcement leading to cracking or spalling concrete which has the potential to compromise structural integrity.
The works will be carried out over an 8 week period, using specialist technicians working from mobile elevated works platforms, roped access techniques (abseil) and mobile towers.
Following completion of the site activities, a structural engineer’s assessment will determine the extent of necessary concrete repair and corrosion control. We will then develop and suitable specification, based upon one of the recognised concrete repair manufacturers repair systems.
This survey project will be completed whilst the blocks are live and therefore it is a requirement for us to ensure these works are completed in an efficient and timely manner, causing minimal disruption to residents.
Structural Renovations Limited are currently restoring part of the river wall in Wapping. The location of our works is at Pelican Wharf, which although was a wharf and warehouse well into the 20th century, is now a luxury apartment block built in 1987.
Access to the works area is limited by the tides which has meant careful planning and programming has had to be put into place to maximise the available working times. We have erected scaffold on the river bed/foreshore, securely fixed to the embankment wall to avoid being washed away at full tide.
The works are concerned with brickwork repair and stabilisation, concrete repair and consolidation and associated ironmongery repairs to the river wall and adjoining access steps between Pelican Wahrf and the historic Prospect of Whitby public house.