Projects · Floor preparation

500 West

Full-floor pump-fed self-leveling · High-rise office, downtown Louisville

Self-leveling underlayment flowing across a high-rise office floor at 500 West, Louisville, with the downtown skyline in the windows
UZIN NC 888
Material
Original concrete slab
Substrate
Full floor
Area
Complete
Project status
The job

A full floor of a downtown Louisville high-rise, gutted to the slab for a new tenant. The original concrete was sound but rolled from bay to bay, and the finish floor going in would show every bit of it. The whole plate had to come to one flat plane before anything else could start.

Hand-mixing a floor this size is not an option — you would be chasing cold joints all day. We ran it as one continuous pump-fed pour of UZIN NC 888. Screed rails were set across the slab to fix the finished height, the mixing pump was staged at the core, and the hose was walked out across the floor bay by bay. One man kept the hopper fed, two walked the hose, and the rest worked the material out with gauge rakes and smoothers as fast as it landed.

Self-leveling underlayment has a short working window. On a pour like this the whole job comes down to keeping the pump running and the crew moving, so every bay ties wet into the one before it. The result is a single monolithic floor, flat from window wall to core, ready for finish flooring.

Bid a similar project

The
work

Pump, hose, rake — in sequence
Open high-rise office floor at 500 West with the pump hose run out and metal screed rails laid across the slab before the pour
The floor before the pour. Hose run out from the pump and the screed rails set across the slab so the underlayment lands at one height.
Trademark Development Group crew loading self-leveling underlayment into a mixing pump beside a pallet of bags
The mixing pump at the top of the run. Bags go in dry, water is metered, and the hose carries the mix across the floor.
Installers in TDG shirts feeding bags into the pump hopper and clearing empties from the floor
Feeding the hopper. On a pour this size the pump never stops, so one man does nothing but keep it fed.
Bags of UZIN NC 888 self-leveling underlayment lined up on the concrete beside the pour
UZIN NC 888 — a cement-based self-leveling underlayment we run through the pump. We are UZIN certified installers.
Crew walking the pump hose across the office floor toward the windows at 500 West
Walking the hose out. Hundreds of feet of line between the pump and the far window wall.
Self-leveling underlayment starting to flow across the concrete floor from the hose
The first material down. It comes off the hose wet and finds its own level within minutes.
Two installers spreading self-leveling underlayment with gauge rakes and a smoother in front of the windows
Gauge rake and smoother, working the material to depth and breaking the surface before it sets.
Wet self-leveling underlayment flowing out to the metal screed rails on a high-rise office floor with city views
Flowing out to the rails. Each bay is poured and struck off before the hose moves to the next one.
Freshly poured self-leveling underlayment reflecting the window wall and skyline like glass
The window wall reflecting off the wet surface. That mirror is the flatness check.
Cured, flat self-leveling underlayment across an open office floor at 500 West, Louisville
Flat, cured and ready for finish flooring — a floor that was anything but flat two days earlier.
See also

Floor preparation & self-levelingTrademark Development Group — the GC side

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