SW-04 · Techniques
Subfloors & Moisture
13 articlesConcrete, plywood and OSB preparation: flatness, moisture and pH testing, barriers and self-levelling.

TechniquesSubfloors & Moisture
Click-lock LVP on uneven concrete is tough, but it’s also picky. Put it over a wavy concrete slab and it can sound hollow, unlock at the joints, or telegraph every ridge like a shirt…
- Filed
- 10 Feb 2026
- Length
- 1,318 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
A self-leveler pour can look perfect at first, then turn into a headache a day later. You tap the surface and hear a dull thud, the floor dents under a boot heel, or a…
- Filed
- 15 Jan 2026
- Length
- 1,549 w
- Read
- ~7 min

TechniquesSubfloors & Moisture
Click-lock LVP can look tough, but the locking joints are picky. If the floor under it has waves, ridges, or dips, the planks can flex, rock, and slowly work the seams loose. Getting LVP…
- Filed
- 13 Jan 2026
- Length
- 1,280 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
A concrete slab can look clean, flat, and dry, then still ruin an LVP install. The surprise is often chemistry, not craftsmanship. Concrete slab pH (a quick read on how alkaline the surface is)…
- Filed
- 12 Jan 2026
- Length
- 1,381 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
Winter installs can feel calm on the surface. The home is quiet, the HVAC is running, and the jobsite looks stable. Then a few weeks later, the call comes in: gaps opened up, end…
- Filed
- 11 Jan 2026
- Length
- 1,319 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
If you install LVP over concrete, you’ve seen it happen: the slab hits “28 days,” the GC wants floors down tomorrow, and your meter says “not so fast.” In 2026, that tension hasn’t gone…
- Filed
- 10 Jan 2026
- Length
- 1,289 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
A concrete slab can look dry, feel hard, and still hold enough moisture to wreck a luxury vinyl plank (LVP) install weeks later. That’s the trap. Moisture moves like smoke, it finds the path…
- Filed
- 09 Jan 2026
- Length
- 1,479 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
Moisture is the quiet troublemaker on LVP jobs. It doesn’t announce itself, it just shows up later as peaking seams, bubbles, loose adhesive, or that “mystery” odor the GC swears wasn’t there at turnover.…
- Filed
- 08 Jan 2026
- Length
- 1,427 w
- Read
- ~6 min

TechniquesSubfloors & Moisture
Basements and crawl spaces don’t fail floors with drama. They do it quietly, with water vapor that creeps up through concrete or soil like steam from a pot with the lid half on. Luxury…
- Filed
- 07 Jan 2026
- Length
- 1,198 w
- Read
- ~5 min

TechniquesSubfloors & Moisture
Moisture is the quiet troublemaker on a jobsite. It doesn’t announce itself, it just waits. Then a floor cups, adhesive lets go, or seams peak after turnover, and everyone asks the same question: “How…
- Filed
- 06 Jan 2026
- Length
- 1,343 w
- Read
- ~6 min