Bulk excavation, temporary works, underground drainage, RC basement formation, waterproofing, steelwork coordination and the suspended slab over. Tonbane delivered a 1.4m basement package for a private developer in Ealing as a single subcontract from dig to slab.
Bulk excavation inside a designed temporary works scheme, with propping and support installed as the dig goes down rather than added once the face is already open.
Reinforced concrete walls and base slab poured as a watertight structure, with the waterproofing system installed to the designer's detail and the joints, water bars and penetrations treated as part of the design.
Underground drainage, sumps, pump chambers and service entries set out and cast in before the slab, because retrofitting a penetration through a finished basement wall is nobody's favourite day.
Steelwork coordinated, decking or formwork set, reinforcement fixed and the suspended RC slab poured to close the box and give the trades above a working platform.
We take basement packages on developer and main contractor schemes, and the scope covers excavation, temporary works, the RC box, waterproofing, drainage and the suspended slab. Where the scheme sits under or against an existing structure, the temporary works and party wall requirements are designed by the appointed engineer and we build to them.
To the waterproofing designer's detail, as a system rather than a product. The RC is poured as a watertight structure and the joints, water bars, penetrations and any cavity drainage are treated as part of the same design, which is where most basement problems are actually made or avoided.
A 1.4m reinforced concrete basement in Ealing for a private developer, covering bulk excavation, temporary works, underground drainage and attenuation, RC formation, waterproofing, structural steelwork and the suspended RC slab.
It depends entirely on the box, the access and the temporary works, so it is not a number we will guess at over the phone. Send the drawings and the site constraints and we will give you a programme against them.
Yes, that is the normal route. Structural and drainage drawings, the waterproofing strategy and any temporary works information are enough for us to price a package properly.
Based in Ealing and working across the London boroughs most weeks, with the Bucks and Herts fringe reached on utility and commercial contracts. If your site is on the list below, a look at the drawings is a short conversation away.
40 Brentham Way, London, W5 1BE
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Ask about our completed developer and main contractor packages.