Laminate and Floating Floor Installation

Installation of Laminate and Floating Flooring

Introduction to Floating Floors

The floating floor is an installation system where the flooring is not mechanically fastened or adhesively bonded to the subfloor. It rests on an underlayment and is assembled by interlocking the planks together. This technique applies to laminate planks, engineered hardwood flooring, and certain luxury vinyl plank/tile (LVP/LVT) products. For the Red Seal exam, you must understand that the term "floating" refers to a mechanical principle: the floor expands and contracts as a single unit, independent of the subfloor.

Laminate is a composite product made up of four distinct layers:

Wear layer (overlay): Aluminum oxide (Al₂O₃) for abrasion resistance.

Decorative layer: Melamine-impregnated paper replicating wood, stone, etc.

Core (HDF or MDF): High-density fiberboard (HDF ≥ 800 kg/m³) or medium-density fiberboard (MDF).

Stabilizing layer: A melamine backing that balances tension.

Engineered hardwood differs from laminate: it has a genuine hardwood veneer (1.5 to 6 mm) bonded to a plywood or HDF backing. It can be sanded and refinished, unlike laminate.

2. Applicable Standards and Codes

In Canada, flooring installation is governed by several national standards. You should be familiar with the following:

Standard	Application
CAN/CGSB-11.3-M	Classification of laminate flooring
ASTM F710	Concrete subfloor preparation before installation
ASTM F1869	Calcium chloride test (moisture emission rate)
ASTM F2170	In-situ relative humidity test (probe)
CSA O118.1	Plywood and wood-based panels
CAN/CGSB-51.34-M	Underlayments and vapour barriers

The National Building Code of Canada (NBC) applies to structural and moisture requirements. Article 9.30.2.2. of the NBC specifies that the subfloor must be dry, clean, and level. The Canadian Electrical Code, Part I (CE Code) applies if you need to drill or cut near electrical circuits — Rule 8-200 for safety clearances.

> Important: Concrete must have a moisture content of ≤ 4.5% (moisture meter test) or ≤ 3.0 lb/1000 ft²/24 h (calcium chloride test ASTM F1869) before installation.

3. Subfloor Preparation

3.1 General Requirements

The subfloor must be:

Dry: Relative humidity ≤ 75% for wood, ≤ 4.5% for concrete.

Clean: Free of dust, oil, wax, and peeling paint.

Level: Tolerance of 3 mm over 3 m (1/8 in over 10 ft) per ASTM F710.

Structurally sound: No active cracks, no delaminated areas.

3.2 Concrete Subfloors

Concrete must be cured for at least 28 days. Shrinkage cracks must be repaired with a polymer-modified cementitious product. Bumps > 3 mm must be ground down; depressions must be filled with a self-leveling compound.

Leveling calculation: For a room measuring 4 m × 5 m with an average depression of 5 mm:

Volume = 4 m × 5 m × 0.005 m = 0.1 m³

One 20 kg bag covers approximately 3 m² at 3 mm thickness.

Total area = 20 m² → 20 ÷ 3 = 6.7 bags → 7 bags.

3.3 Wood Subfloors

Plywood must be a minimum of 19 mm (3/4 in) thick for joists spaced at 400 mm (16 in) on center. Panels must be installed in a staggered pattern with a 3 mm gap between panels. Any irregularity > 3 mm must be sanded down or compensated for.

3.4 Moisture Testing — Methods

Method	Standard	Acceptance Criteria
Calcium chloride	ASTM F1869	≤ 3.0 lb/1000 ft²/24 h
In-situ probe	ASTM F2170	≤ 75% RH
Pin-type moisture meter	—	≤ 4.5% for concrete

Exam trap: The calcium chloride test measures water vapour emission (transmission rate), not moisture content. The probe test measures the internal relative humidity of the concrete. Both are valid, but the probe test is more reliable for slabs on grade.

4. Underlayments and Vapour Barriers

4.1 Roles of the Underlayment

The underlayment (foam, cork, felt) serves several functions:

Acoustic insulation: Reduces impact noise (INR ≥ 50 dB).

Compensates for minor irregularities: ≤ 2 mm.

Moisture barrier: Some underlayments incorporate a polyethylene vapour barrier.

Foot comfort: Provides resilience.

4.2 Choosing the Underlayment by Product Type

Floor Type	Recommended Underlayment	Max. Thickness
Laminate (AC3-AC4)	PE foam 2 mm	3 mm
Laminate (AC5)	Felt 2 mm	3 mm
Nail-down engineered	15 lb felt paper	—
Floating engineered	Cork 2 mm	3 mm
LVP (vinyl)	LVP-specific underlayment	1.5 mm

Critical rule: An underlayment that is too thick (> 3 mm) causes excessive joint deflection and can break the interlocking mechanisms. The underlayment must never be stapled or glued to the subfloor for a floating floor.

4.3 Mandatory Vapour Barrier

On concrete slabs (in contact with the ground or above a crawl space), a 6 mil (0.15 mm) polyethylene vapour barrier must be installed between the concrete and the underlayment. Sheets must overlap by 200 mm and be sealed with adhesive tape. This requirement comes from NBC Article 9.25.4.2.

5. Installation Techniques

5.1 Acclimation

Planks must be acclimated in the installation room for a minimum of 48 hours at a temperature of 18-24 °C and a relative humidity of 35-55%. Packages must be opened and stacked in a crisscross pattern to allow air circulation.

Acclimation calculation: For a 20 m² room with a wood moisture content of 8% and an ambient RH of 50%, the wood will reach an equilibrium of ~9.5% EMC. The dimensional change is:

ΔL = L × α × ΔMC

Where α = 0.002 (linear expansion coefficient of HDF), ΔMC = 1.5%.

For a 5 m length: ΔL = 5 × 0.002 × 1.5 = 0.015 m = 15 mm.

5.2 Expansion Gap

The perimeter gap (expansion space) is mandatory:

Minimum 8 mm (5/16 in) along walls and fixed obstacles.

Minimum 12 mm for rooms > 12 m in length.

Maximum 15 mm to ensure the baseboard covers the gap.

Calculation rule: Gap = 1.5 mm per meter of room width, with a minimum of 8 mm. For a room 6 m wide: 6 × 1.5 = 9 mm.

5.3 Installing Planks — Locking Methods

Lock Type	Assembly Method	Required Tool
Click lock	Angle at 30-45° then lower	None
Lock (tap)	Lateral tapping using a tapping block	Block + mallet
Glue lock	Apply PVA glue in the groove	Glue, straightedge

Standard procedure (click installation):

65.Lay the first row with the tongue facing the wall, inserting spacers of 8-12 mm.

66.Engage the second plank into the first by angling at 30° and lowering.

67.For the last row, measure the remaining width minus the expansion gap, mark, and cut with a circular saw (fine-tooth blade) or jigsaw.

68.Use a pull bar for the last rows near the wall.

69.End joints must be staggered by at least 300 mm (12 in) between adjacent rows.

5.4 Cutting and Fitting

Circular saw: For straight cuts, 40-tooth carbide blade, cut with the decorative side facing up.

Jigsaw: For curved cuts, cut with the decorative side facing down.

Retractable utility knife: For scoring the HDF and snapping (score-and-snap technique).

Exam trap: The score-and-snap cut only works for HDF laminate, not for engineered hardwood (which has a real wood veneer).

5.5 Doorways and Obstacles

Under door frames: Cut the bottom of the frame with a handsaw or jamb saw, and slide the plank underneath. The plank must fit under the frame with a 2 mm clearance.

Pipes: Drill a 20 mm diameter hole (pipe diameter + 16 mm for expansion), then cut the plank in two pieces along the hole's axis, and engage both pieces around the pipe.

Transitions: Use transition profiles (reducer, threshold, expansion joint) for level changes > 3 mm.

6. Quantity Calculations

6.1 Net Area and Waste

The standard formula:

Quantity (m²) = Room area × (1 + % waste)

Installation Type	% Waste
Straight layout (parallel to long wall)	5-8%
Diagonal layout (45°)	10-15%
Herringbone layout	15-20%

Example: Room measuring 4.5 m × 6.0 m = 27 m². Straight layout with 7% waste:

27 × 1.07 = 28.89 m² → 29 m² (round up to the next full package).

6.2 Number of Packages

Each package covers an area indicated on the label (e.g., 2.13 m²). For 29 m²:

29 ÷ 2.13 = 13.6 → 14 packages.

6.3 Calculating Planks per Row

Standard plank width: 190 mm (7.5 in).

Number of planks per row = (Room length) ÷ (Plank length).

For a 6 m room with 1.2 m planks: 6 ÷ 1.2 = 5 full planks.

The last plank will be cut to the remaining length minus the expansion gap.

7. Product-Specific Requirements

7.1 Laminate (AC1 to AC5)

The AC (Abrasion Class) rating per CAN/CGSB-11.3-M:

Class	Usage	Traffic	Resistance
AC1	Light residential	Bedroom	Moderate
AC2	Medium residential	Living room	Medium
AC3	Heavy residential	Hallway, kitchen	High
AC4	Light commercial	Office, boutique	Very high
AC5	Heavy commercial	Store, school	Extreme

For the exam: AC4 is the minimum recommended for commercial applications in Canada.

7.2 Floating Engineered Hardwood

Hardwood veneer thickness: 2 to 6 mm. Above 6 mm, it can be sanded once.

The locking system is identical to laminate, but the top layer is softer.

Never sand engineered hardwood with a veneer < 2 mm — risk of cutting through the decorative layer.

The expansion gap must be 10-12 mm (solid wood expands more than HDF).

7.3 Luxury Vinyl Plank/Tile (LVP/LVT)

LVP (luxury vinyl plank) and LVT (luxury vinyl tile) use a click lock or glue-down installation.

Mandatory underlayment: closed-cell foam, 1.5 mm max.

Minimum installation temperature: 18 °C — below this, the locking mechanisms become brittle.

LVP is waterproof, but the subfloor must still be dry (≤ 4.5%).

8. Finishing and Transitions

8.1 Baseboards and Quarter Rounds

Baseboards are fastened to the wall (never to the floor) to allow for expansion. The quarter round (11/16 in × 11/16 in molding) is installed at the base of the baseboard to cover the expansion gap. It must be nailed to the baseboard, not to the floor.

8.2 Transition Profiles

Type	Usage
Reducer	Transition between two different levels (3-12 mm)
Threshold	Doorway passage, same level
T-molding (expansion joint)	Large rooms > 12 m, direction changes
End cap	Transition to a lower floor (carpet)

8.3 Intermediate Expansion Joints

For rooms exceeding 12 m in length or 8 m in width, an intermediate expansion joint is mandatory. This is achieved with a T-profile fastened to the subfloor, with a 10 mm gap on each side of the profile.

9. Quality Control and Inspection

9.1 Pre-Installation Checks

Verify the lot number on packages — mixing different lots can cause shade variations.

Inspect each plank for defects (chips, warping, colour variation).

Ensure the underlayment is rolled out in the same direction as the plank installation.

9.2 Post-Installation Checks

Walk on the floor to detect squeaks (causes: underlayment too thick, uneven subfloor, improperly engaged locks).

Check joint alignment using a 3 m straightedge.

Check the expansion gap with spacers every 1.5 m.

Ensure doors close freely (clearance under the door ≥ 15 mm).

9.3 Acceptable Tolerances

Defect	Tolerance
Level variation between planks	≤ 0.5 mm
Joint gap between planks	≤ 0.3 mm
Overall flatness	3 mm over 3 m
Expansion gap	8-15 mm

10. Occupational Health and Safety

Saws: Use a blade guard, safety glasses, and an N95 dust mask when cutting HDF (formaldehyde dust).

Material handling: Laminate packages weigh 15-25 kg — use safe lifting techniques (bend your knees, keep your back straight).

Ventilation: Work in a ventilated area when using adhesives or leveling compounds.

WHMIS: Know the Safety Data Sheets (SDS) for adhesives, primers, and levelers.

11. Common Pitfalls to Avoid

140.Forgetting the vapour barrier on concrete slabs — the most frequent cause of failure. The vapour barrier is mandatory even if the underlayment claims to be "waterproof."

141.Underlayment too thick — 6 mm foam under laminate causes lock failure. Maximum 3 mm.

142.Not leaving an expansion gap under baseboards — baseboards must be installed after the flooring, never before.

143.Confusing the calcium chloride test with a moisture meter — the former measures vapour emission, the latter measures moisture content.

144.Installing without acclimation — laminate must acclimate for 48 h, not 24 h. Dimensional changes after installation cause joint gaps.

145.Using a metal tapping block — it damages the tongue. Always use a wooden or rubber tapping block.

146.Score-and-snap cutting engineered hardwood — this technique only works for HDF.

147.Forgetting to stagger end joints — aligned joints create weak points and an unattractive appearance. Minimum stagger: 300 mm.

148.Installing over a damp subfloor — concrete must have ≥ 28 days of curing. A moisture test is always required.

149.Not calculating waste — a straight layout requires 5-8% waste; a diagonal layout requires 10-15%.

12. Summary

The floating floor is based on the principle of free expansion: planks are joined together but never fastened to the subfloor.

Laminate is a composite HDF product with a decorative layer; engineered hardwood has a genuine wood veneer.

The subfloor must be dry (≤ 4.5% concrete), clean, and level (3 mm/3 m).

Moisture tests: ASTM F1869 (calcium chloride ≤ 3.0 lb/1000 ft²/24 h) and ASTM F2170 (probe ≤ 75% RH).

A 6 mil vapour barrier is mandatory on concrete slabs.

The underlayment must not exceed 3 mm for laminate.

Expansion gap: 8 mm minimum, 12 mm for large rooms, calculated at 1.5 mm/m.

Acclimation: 48 hours at 18-24 °C, 35-55% RH.

Waste: 5-8% straight layout, 10-15% diagonal, 15-20% herringbone.

AC rating: AC3 residential, AC4 light commercial, AC5 heavy commercial.

Baseboards and quarter rounds are fastened to the wall, never to the floor.

Intermediate expansion joints are required beyond 12 m in length.

Safety: safety glasses, N95 mask, ventilation, WHMIS.

13. Self-Assessment Questions

167.What is the minimum expansion gap for a room measuring 4 m × 5 m?

Answer: 8 mm (1.5 mm/m × 4 m = 6 mm → minimum 8 mm).

169.A concrete slab shows 5.5% moisture on a moisture meter. What do you do?

Answer: Wait — the threshold is 4.5%. Installing an additional vapour barrier does not fix the problem.

171.How many packages are needed for 30 m² with 8% waste, knowing that one package covers 2.13 m²?

Answer: 30 × 1.08 = 32.4 m² → 32.4 ÷ 2.13 = 15.2 → 16 packages.

173.What is the difference between an ASTM F1869 and ASTM F2170 test?

Answer: F1869 measures water vapour emission (lb/1000 ft²/24 h); F2170 measures the internal relative humidity of the concrete (% RH).

175.Can engineered hardwood with a 1.5 mm veneer be sanded?

Answer: No — a minimum of 2 mm is required for a single sanding.

14. Normative References

CAN/CGSB-11.3-M: Laminate flooring — classification and requirements.

ASTM F710: Concrete preparation before flooring installation.

ASTM F1869: Calcium chloride test.

ASTM F2170: In-situ relative humidity test.

CSA O118.1: Plywood and wood-based panels.

National Building Code of Canada (NBC) 2020: Articles 9.25.4.2 (vapour barrier), 9.30.2.2 (subfloor).

Canadian Electrical Code, Part I (CE Code): Rule 8-200 (safety clearances).

This chapter covers all the competencies assessed for the "Installation of Laminate and Floating Flooring" block of the Red Seal exam. Review the quantity calculations, moisture tests, and tolerances — these are the most frequently asked questions on the exam.