Chapter 29 Exercises: Flooring Systems

These exercises develop practical flooring assessment and repair skills, from subfloor evaluation through finish floor maintenance and squeak repair.

Exercise 1: Subfloor Flatness Assessment

Skill: Subfloor evaluation Time required: 1–2 hours

In a room that will be, or recently has been, re-floored (or in any room with carpet or vinyl that can be pulled back in a corner), assess the subfloor:

  1. Obtain an 8–10-foot straightedge (a long level works; a piece of straight lumber works if checked for straightness)
  2. Lay the straightedge in multiple directions across the floor: with the joists, across the joists, and diagonally
  3. Measure the gap between the straightedge and any low point beneath it using a feeler gauge or a dollar bill (which is approximately 0.1mm thick — stack bills to estimate gap size)
  4. Record the maximum deviation and its location
  5. Compare to standards: 3/16 inch in 10 feet for most flooring; 1/8 inch in 10 feet for tile

If high spots exist, note where and estimate the correction method (belt sanding, floor grinder). If low spots exist, note and estimate self-leveling compound volume.

Deliverable: Flatness assessment map with maximum deviation and recommended corrective action.

Exercise 2: Subfloor Moisture Testing

Skill: Pre-installation moisture measurement Time required: 30 minutes

If you have access to an exposed subfloor (from a flooring project, under a removed appliance, or at a corner under carpet), measure moisture content:

  1. Purchase or borrow a pin-type moisture meter ($20–$80 at hardware stores) — useful for any wood-related home project
  2. Take readings at multiple points across the subfloor: center, corners, along walls
  3. Compare to acceptable ranges: Most flooring manufacturers specify 6–9% for interior subfloors; check your specific product's installation guide
  4. If elevated: Identify the source (exterior wall, plumbing, basement humidity) and determine whether the condition is temporary (new construction drying out) or chronic (requires moisture control before flooring)

For concrete slabs, purchase a calcium chloride test kit ($20–$40 per test) and follow ASTM F1869 procedure — this involves taping a sealed dish of calcium chloride to the concrete, then weighing the dish 60–72 hours later to measure water absorption.

Deliverable: Moisture content readings with interpretation and any indicated corrective action.

Exercise 3: Identify and Locate Squeaky Floor Sources

Skill: Diagnostic skills Time required: 30–60 minutes

Select a squeaky floor area in your home. Work systematically to locate the specific source:

  1. Walk the squeak area slowly, stopping when you hear the sound. Mark the exact location with blue tape.
  2. Characterize the squeak: Is it a single point or does it occur over a 12-inch span? Does it occur when walking both directions across it, or only when weight is applied going one direction?
  3. Identify the framing below: Use a stud finder or drive a probe nail to locate the nearest joists on each side of the squeak.
  4. Assess the squeak type: Is it in a flooring-to-subfloor joint, a subfloor-to-joist joint, or an isolated plank (for hardwood)?
  5. If accessible from below: Have a helper walk the squeak while you watch from the crawlspace or basement. Can you see the subfloor moving? Can you identify a gap between subfloor and joist?

Document the source type and location, then choose the appropriate repair method from Section 29.6.

Deliverable: Squeak source documentation with recommended repair method.

Exercise 4: Repair a Squeaky Floor — From Above

Skill: Squeak repair Time required: 30–60 minutes

Using the source identified in Exercise 3 (or any accessible squeak), perform a repair from above:

For carpeted floors: Use Counter-Snap or similar snap-off screw system. Drive the screw through the carpet backing and into the joist. Confirm the screw head is below carpet backing. Test by walking — is the squeak reduced or eliminated?

For hardwood floors: Locate joist. Drill a pilot hole at an angle through a grout line or at the nail line of a board. Drive a 2-inch screw, countersink, fill with wood putty matching the floor color. Test. Evaluate visibility of repair.

For any floor with subfloor-to-joist gap (from above): Drive 2-inch drywall screws through finish floor and subfloor into the joist, using a bit that countersinks the head slightly.

Document the repair with before and after "squeak test" — walk across the repair 10 times and rate the squeak reduction: eliminated, significantly reduced, or unchanged. If unchanged, reassess source location.

Deliverable: Repair documentation with effectiveness rating.

Exercise 5: LVP Wear Layer Comparison

Skill: Product evaluation Time required: 1–2 hours at a flooring store

Visit a flooring showroom or home improvement center that carries luxury vinyl plank products. Identify at least four products at different price points:

For each product, find and record: 1. Wear layer thickness (in mil) — this will be on the package; ask a salesperson if not obvious 2. Core type (SPC or WPC) 3. Total thickness of the plank 4. Whether underlayment is attached 5. Warranty duration (for residential use) 6. Price per square foot

Build a comparison table. Calculate the cost per mil of wear layer for each product. Which products represent the best value when measured this way rather than by total price?

Also evaluate by feel: press your thumbnail into the surface of each product. Notice the firmness difference between thin and thick wear layers. Ask to see the cross-section of a sample piece.

Deliverable: Comparison table with value analysis.

Exercise 6: Hardwood Floor Condition Assessment

Skill: Refinishing readiness evaluation Time required: 45 minutes

If your home has hardwood floors, assess their condition and refinishing readiness:

  1. Check finish condition: In high-traffic areas (in front of doorways, at kitchen entry), does the finish look cloudy, worn, or show bare wood?
  2. Scratch test: Use a key or coin to gently scratch an inconspicuous area. Does it scratch the finish (surface level) or does the scratch cut into bare wood? Surface scratches indicate finish wear; bare wood exposure means the floor needs refinishing.
  3. Measure remaining wear layer: At a floor register, heat vent, or doorway transition, you may be able to see the floor from the side. Is there still a visible amount of wood above the tongue? Solid 3/4-inch hardwood that has been refinished multiple times may have limited remaining material.
  4. Count previous refinishing: Look at the side profile at a threshold or vent — each refinishing removes material, and heavily refinished floors show a narrower board thickness.
  5. Water test: Drop a few water drops on the floor in a traffic area. If they bead (surface tension intact), the finish is still protective. If they absorb immediately, the finish is compromised.

Deliverable: Condition report with recommendation: no action needed, screening and recoating (light buff + new finish layer), or full sand and refinish.

Exercise 7: Tile Substrate Planning

Skill: Tile installation planning Time required: 1–2 hours

Plan the tile substrate installation for a hypothetical bathroom remodel (or an actual one if you have one planned). The room is 8x10 feet with a 3/4-inch plywood subfloor on 16-inch joist centers:

  1. Calculate deflection: For a 12-foot joist span with 40 psf live load and 10 psf dead load, does the existing structure meet the L/360 deflection limit for tile? (Your structural engineer or a structural engineer's reference guide can confirm — or look up the L/360 requirement for your joist size and span.)
  2. Choose a substrate: Cement board or uncoupling membrane (DITRA)? Research the cost per square foot and installation requirements for each. Note that DITRA adds approximately 1/4 inch while cement board adds 1/2 inch — calculate the impact on your door swing clearance.
  3. Calculate materials: How many 3x5-foot sheets of cement board are needed for the floor? (Include 10% waste factor.) How many boxes of thinset for setting the cement board plus the tile?
  4. Layout planning: For 12x12-inch tiles, where does the first full tile go to ensure no cuts smaller than half-tile at any visible edge?

Deliverable: Written installation plan with materials list and cost estimate.

Exercise 8: Flooring Height Change Cascade

Skill: Renovation planning Time required: 1 hour

Plan a flooring replacement that involves a height change. Starting conditions: existing 3/4-inch hardwood floor. New floor: 1/2-inch engineered hardwood (slightly lower) in one room, 3/8-inch LVP (lower) in an adjacent room, and existing 3/8-inch tile in a bathroom (unchanged).

For each transition: 1. Calculate the height difference between adjacent floor surfaces 2. Select the appropriate transition strip type from Section 29.7 3. Determine whether any door bottoms require trimming 4. Identify where the transition strip should be located (typically at the door centerline)

Additionally, calculate how much the new floors reduce the ceiling height relative to door heights and whether door casings require undercutting.

Deliverable: Transition plan with strip types, door trimming requirements, and any other adjustments.

Exercise 9: Carpet Odor Assessment

Skill: Carpet condition evaluation Time required: 15 minutes

If your home has carpet — especially if purchased from a previous owner — perform the odor assessment described in Section 29.5:

  1. Dry sniff: Get close to the carpet in a low-traffic area (behind a door, in a closet). Note any odor.
  2. Wet test: Dampen a section of carpet (8–10 square inches) with water. Wait 2 minutes. Press a clean white cloth against it for 30 seconds.
  3. Examine the cloth: Discoloration? Odor on the cloth? Strong odor released from the carpet when wet?
  4. Check the pad: If you can access a corner or edge where the carpet has been pulled back (at a closet threshold, near a heating vent cover), inspect the pad. Is it firm and intact, or compressed, discolored, or clearly saturated with previous moisture?

If the wet test reveals significant odor or discoloration, investigate the source (pet urine, water damage, mold) before deciding whether to clean, remediate, or replace.

Deliverable: Condition assessment report with recommendation.

Exercise 10: Flooring Cost Comparison for a Real Space

Skill: Budgeting and material selection Time required: 2–3 hours

Choose a real room in your home (or a hypothetical renovation space) and build a cost comparison for three flooring options. Measure the room accurately (length x width plus any alcoves; subtract fixed features like built-ins).

For each flooring option: - Material cost per square foot (research current retail prices) - Underlayment cost per square foot (if needed) - Estimated subfloor preparation cost (assume your specific subfloor conditions) - Installation: professional labor estimate (call one flooring installer for a quote) vs. DIY estimate (your time + tool rental) - Expected lifespan and refinishing/replacement cost at end of life

Build a 20-year total cost of ownership comparison. Which option has the lowest 20-year cost? Which has the best appearance vs. cost trade-off?

Deliverable: Cost comparison table with 20-year ownership analysis and recommendation.

Exercise 11: Transition Strip Inventory

Skill: Detail assessment Time required: 30 minutes

Walk every doorway and floor-type transition in your home. For each, note: 1. What type of transition strip is present (T-molding, reducer, end cap, threshold, etc.)? 2. Is it secured properly (not lifting, not rocking)? 3. Is it the correct type for the height difference between the two floors? 4. Is it aesthetically appropriate (matches floor color, correct material)? 5. Is there any trip hazard (transition higher than 3/8 inch above either floor)?

Note any transitions that are damaged, missing, or incorrect. Research the replacement cost for any items on your list.

Deliverable: Transition inventory with action items.

Exercise 12: Plan a Squeak Prevention Strategy for a New Floor

Skill: Preventive planning Time required: 1 hour

If you are planning a flooring project (or planning it hypothetically), develop a squeak prevention plan before installation:

  1. Subfloor inspection: How will you check for loose panels before the finish floor goes down? (Walk the subfloor listening for squeaks; find loose panels by prying gently at edges.)
  2. Re-fastening: Plan to add drywall screws through the subfloor into every joist at 8-inch spacing before installing finish floor — this eliminates the most common squeak cause proactively.
  3. Squeaky stairs: If stairs are part of the project, how will you address the tread-riser-stringer connections?
  4. Adhesive: For hardwood nail-down installations, should construction adhesive be used between the subfloor and finish floor in addition to nailing? (Some installers do this; research pros and cons.)

Write a one-page squeak prevention protocol for your specific project.

Deliverable: Written squeak prevention protocol.