Ardex SD-P Self-Drying Trowelable Concrete Underlayment
A trowelable, self-drying underlayment for concrete subfloors, gray finish, in standard and Rapid formulas so you can match dry time to your schedule.
Free pickup in Markham once it arrives (1–2 weeks) · GTA delivery $140
Specs
| Category | Subfloor Prep |
| Type options | SD-P 40 lb · SD-P Rapid 40 lb |
| Unit sold | SD-P 40 lb (SD-P 40 lb) |
| Availability | Order-in — usually 1–2 weeks |
| Code | ARSDP40LB |
How to use Ardex SD-P Self-Drying Trowelable Concrete Underlayment
- 1Clean the subfloor of dust and loose debris first.
- 2Prime if the product calls for it — most self-levelers and patch compounds need a compatible primer on concrete.
- 3Mix with water to the consistency the bag specifies, using a drill and paddle mixer for a lump-free batch.
- 4Pour or trowel it on, feathering patch compounds to a true zero edge, or spreading self-levelers with a gauge rake.
- 5Let it cure fully per the bag’s schedule before installing your new floor — cure time varies by floor covering type.
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FAQ
How do I know if I need a patch compound or a full self-leveling pour?
Small gouges, seams, and low spots (under about 1/4") are a job for a patch/skimcoat compound. A subfloor that’s sloped, or has low spots across a large area, needs a self-leveling underlayment that pours and finds its own level. Ask us if you’re not sure which your floor needs.
How long before I can install flooring over it?
Cure time depends on the product and your new floor covering — check Ardex SD-P Self-Drying Trowelable Concrete Underlayment, Gray - 40 lb’s bag for the exact window, and always confirm before laying flooring over a fresh pour.
Not sure which product you need?
Use our supplies calculator to get a full kit recommendation for your floor type and subfloor, or ask us directly.