Self-Leveling Concrete & Cementitious Underlayment in Gaithersburg, MD

Self-leveling cementitious underlayment is a flowable cement-based material used over a properly prepared substrate to improve surface flatness or create a suitable surface for subsequent flooring systems. It is poured or pumped and spread to a relatively uniform thickness, then allowed to flow and level before it sets.

In Gaithersburg and across Montgomery County, self-leveling underlayment is used in basements, renovations, commercial interiors, residential interiors, flooring transitions, and over uneven but stable slabs where the goal is a flatter surface for a finished floor — tile, resilient flooring, coatings, carpet, or other finished floors where relevant.

We do not imply that self-leveling material is structural concrete, and we do not call every cementitious underlayment concrete. The accurate wording is self-leveling cementitious underlayment or self-leveling floor underlayment where appropriate. It improves flatness over a suitable substrate; it does not carry structural loads and it does not correct foundation settlement.

Self-leveling underlayment is used to address surface irregularities, small elevation differences, low areas, and the floor preparation needed before a finished flooring system. It is common in renovation projects and in transitions between surfaces where a flatter substrate is required for the final floor.

What Self-Leveling Underlayment Is Not Intended to Solve

Self-leveling underlayment is not a solution for:

• Slab settlement caused by failed subgrade or base
• Structural movement or foundation issues
• Major cracking or structural slab failure
• Severe moisture problems beneath or through the slab
• A slab that needs to be raised as a structural unit

Where the slab has settled structurally, the appropriate service is concrete leveling or replacement — not underlayment. Where moisture is unresolved, no cementitious material will perform reliably over the slab. We assess the substrate before recommending underlayment and tell you plainly when a different service is the better fit.

A dependable underlayment installation follows the substrate's condition. The floor is assessed, prepared, primed, and then the flowable material is mixed, placed, and gauged to the intended thickness for the selected system.

1. 1Substrate assessment — evaluate the concrete condition, flatness, and existing materials.
2. 2Moisture review — check for vapor or moisture conditions that could affect the underlayment or the finished floor.
3. 3Removal of coatings and contaminants — strip incompatible sealers, adhesives, or contamination where required.
4. 4Mechanical preparation where required — profile the substrate so the underlayment bonds.
5. 5Crack and joint review — assess how existing cracks and joints will be treated.
6. 6Primer according to the selected system — apply the primer the product requires for adhesion.
7. 7Perimeter and transition preparation — address edges, transitions, and containment for the flowable material.
8. 8Mixing — prepare the underlayment to the selected system's requirements.
9. 9Placement — pour or pump the material over the prepared substrate.
10. 10Spreading and gauging — spread and gauge the material to the intended uniform thickness.
11. 11Curing and drying — allow the underlayment to cure and dry according to the system before the finished floor is installed.
12. 12Preparation for the final floor system — confirm readiness for tile, resilient flooring, coatings, carpet, or other finished floors where relevant.

We do not provide DIY mix ratios. The mixing, placement, primer, and cure requirements depend on the selected product system and the substrate conditions.