Flooring Diagrams
12 diagrams · 4 calculators
Subfloor panel orientation and fastening, floating-floor expansion gaps, plank stagger and layout waste, carpet seam placement, and shower mud-bed assemblies — from the joists up to the finish surface.
Calculators in this category
Flooring · 12 diagrams
- Flooring
Shower mud bed assembly — layered cross-section from the wall to the center drain
A shower floor is two mortar beds, not one: a pre-slope under the liner and a finish bed on top. Both slope ¼″ per foot to the drain.
- Flooring
Center-drain shower pan geometry and the four-plane mortar volume formula
A center drain slopes from all four sides, so the bed holds more mortar than “area × average depth.” This calculator uses the four-plane formula.
- Flooring
Wire mesh reinforcement placement in a mortar bed — wrong versus right
Wire reinforcement belongs at mid-depth on chairs — not flat on the subfloor, where it does nothing.
- Flooring
How flooring layout affects waste — straight ≈10%, diagonal ≈15%, herringbone ≈17.5%
The same room needs more flooring as the layout gets more angled: straight ≈10% waste, diagonal 45° ≈15%, herringbone ≈17.5%+. The angled patterns throw away a cut at every wall.
- Flooring
Floating-floor expansion gap — leave ¼″–⅜″ at the wall or the floor buckles
A floating floor moves as one sheet. Leave a ¼″–⅜″ expansion gap at every wall (hidden by the baseboard) — butt it tight and it buckles when it expands.
- Flooring
How to stagger plank end joints — random offset ≥6″ vs. H-joints and stair-steps
Stagger plank end joints randomly, offset at least 6″ row to row (8″–10″ for wide planks). Avoid H-joints (joints lining up) and a repeating stair-step pattern.
- Flooring
Carpet roll width drives seams — a room wider than the 12-ft roll needs a fill strip
Carpet comes off a fixed-width roll (12 ft is the US standard). Any room wider than the roll needs a second strip and a seam, so you buy more than the bare square footage. Run strips along the longer wall to keep seams short.
- Flooring
Carpet seam placement & pile direction — run seams with the light, all pile one way
Two rooms of identical size need different layouts. Run seams parallel to the main window light, out of traffic and pivot points, and keep every strip’s pile (nap) facing the same way — reverse one and the halves look like two colors.
- Flooring
Stretch-in carpet anchoring — tackless strip, gully and pad hold it tight without glue
A stretch-in carpet is anchored, not glued: a tackless strip (pins toward the wall) grips the stretched carpet, the pad butts to the strip, and the edge tucks into the gully. This is what the tackless-LF and pad-roll outputs cover.
- Flooring
Subfloor panel orientation — lay the 8-ft length across the joists, not along them
Lay the 8-ft panel length ACROSS the joists, not along them — that puts the sheet on every joist instead of just a few. Pick the panel by span rating: it must be ≥ your joist spacing (23/32″ = 24 o.c. covers 16/19.2/24″).
- Flooring
Stagger subfloor end joints and leave a 1/8-inch gap at the square ends
Stagger end joints at least 4 ft row-to-row (running bond) — stacked joints make a weak seam that telegraphs through the finish floor. Leave a 1/8″ gap at the SQUARE end joints only; the T&G long edges self-gap.
- Flooring
Subfloor fastener schedule — 6 in at panel edges, 12 in in the field, plus glue
Fasten 6″ on center at the panel edges and 12″ in the field (IRC R602.3(1)): 2 edge joists × 9 + 5 field joists × 5 = 43 screws per 4×8 sheet. Run a continuous glue bead on every joist first — glue + screws is the APA squeak-free floor.