The basement floor is the slab the rest of your lower level is built on. Portland Concrete pours basement floors over the right vapor barrier and underlayment, finished flat enough for whatever goes on top, polished as the finish, tiled, planked or carpeted later. We pour new basement floors for new builds, and replacement slabs when an old basement floor is cracked, sloped or moisture-damaged beyond repair. Every project starts with a free written estimate.
A basement floor is not just a slab, it is the foundation for every finish above it. If it is poured straight on the dirt with no vapor barrier, moisture rises through it for the life of the building and the finish above goes bad. If it is poured uneven, every tile lippage and every plank gap shows up later as a complaint, not a celebration.
We pour basement floors the way they should be poured, vapor barrier sealed at every seam, the right rigid underlayment where moisture is a concern, slab thickness matched to use, finished flat enough for the finish that goes on top. Where the finish is the floor itself (a polished slab is a real option in Portland basements), we adjust the finishing pass for that.
The subgrade is leveled and compacted, gravel is added where needed, the surface is brought to plan elevation, and any plumbing or radon stubs are protected before the barrier goes down.
Lay barrier and underlayment
The vapor barrier is laid and sealed at the seams, rigid foam or other underlayment is added if specified, and rebar or mesh is placed at the right height for the slab thickness.
Pour the basement slab
Concrete is placed, screeded to a flat plane, bull-floated, and then finished to match the finish above, smooth for tile or plank, polished if the slab is the floor.
Saw-cut and protect cure
Control joints are saw-cut on the schedule the slab needs, the surface is protected through cure, and the basement is handed back with the slab ready for trades to start above it.
When a basement floor gets ripped out
Replacing a Basement Slab That Is Already Bad
Sometimes the right call is a new slab on top of the old, sometimes it is a full tear-out. Where the old slab is cracked because the underlayment failed, or where moisture is coming up everywhere because no barrier was ever there, or where the slope is wrong for finished use, an overlay is going to fail the same way.
We diagnose the actual cause first, sometimes a crack repair or a waterproofing upgrade fixes the symptom; sometimes only a fresh slab is honest. The quote will say which.
New builds, replacement slabs, vapor barriers and finish-ready floors in Portland basements.
Yes, in Portland basements where the ground is consistently damp, a sealed vapor barrier under the slab is essential. Without it, moisture migrates up through the concrete for decades and ruins finishes on top, no matter how good the slab itself is.
Yes, polished basement floors are a real option here. We adjust the finishing pass, then grind, hone and polish the slab to the gloss level chosen, and the basement floor itself becomes the durable, low-maintenance finish.
Yes. Cracked or wet slabs almost always have an underlying cause, missing barrier, bad drainage, settlement. We diagnose it, fix that, then pour a new slab on the corrected base so the new floor does not inherit the old problem.
Most residential basement slabs are several inches thick over the prepared subgrade, reinforced with mesh or rebar. Exact thickness depends on the slab's use and the engineer's spec; the quote ties to your build.
You can usually walk on it within a day or two, but moisture testing should drive when finishes go on top. We hand back the slab with cure-time guidance so the tile, plank or carpet above does not get applied too early.
Homeowner reviews
What Portland Homeowners Say About Their Basement Floors
They flagged the missing vapor barrier under our old slab before quoting. Re-poured properly, sealed seams. Two springs in, the new floor is dry. Total game-changer for the basement.
Z. A.
Portland
★★★★★
Polished basement floor and it looks incredible. They adjusted the finishing pass for the polish, then ground and honed it themselves. One contractor, slab to shine.
Y. X.
Vancouver
★★★★★
New build basement floor poured perfectly flat. The tile guys came in after and said it was the easiest install they had done all year. Their flatness call paid off.
Y. N.
Hillsboro
★★★★★
Tore out a slab that had been pouring wet for years. They found the source, fixed it, then poured a new one. Honest sequence, honest quote. Basement is finally usable.
W. D.
Gresham
From the blog
Concrete Guides & Articles
Practical reading on planning, finishes and caring for concrete in Portland.
Tell us whether this is a new build, a replacement slab or a polished-floor project, and we will quote the basement floor in writing after a free on-site measure.
