Module: VctFinishLayerCount2026

Defined in:
lib/vct_finish_layer_count_2026.rb

Overview

VCT Finish Layer Count 2026 — Ruby Engine

Burnishing response, repairability, and COF/slip compliance calculator for commercial VCT floor maintenance programs.

Reference: www.binx.ca/guides/vct-finish-layer-count-optimization-2026.pdf Published by Binx Professional Cleaning, North Bay and Sudbury, Ontario.

Constant Summary collapse

VERSION = 
"0.1.0"
FINISH_TYPES = 
%w[acrylic_zinc acrylic_no_metal high_solids].freeze
TRAFFIC_LEVELS = 
%w[low medium high extreme].freeze
ZONE_TYPES = 
%w[dry_general wet_general accessible_route healthcare_wet].freeze
BURNISH_DATA = 
{
  "acrylic_zinc" => {
    1  => [12, 18, 22, 0],  2  => [22, 30, 34, 0],  3  => [34, 52, 60, 0],
    4  => [42, 64, 74, 0],  5  => [48, 72, 82, 0],  6  => [52, 78, 88, 0],
    7  => [54, 80, 90, 0],  8  => [54, 80, 89, 1],  9  => [53, 79, 87, 1],
    10 => [51, 75, 82, 2], 11  => [48, 68, 74, 2], 12  => [44, 60, 66, 2],
    13 => [40, 54, 59, 3], 14  => [38, 50, 55, 3],
  }.freeze,
  "acrylic_no_metal" => {
    1  => [10, 15, 18, 0],  2  => [18, 26, 30, 0],  3  => [28, 44, 52, 0],
    4  => [36, 56, 66, 0],  5  => [42, 64, 74, 0],  6  => [44, 68, 78, 0],
    7  => [46, 70, 80, 0],  8  => [44, 68, 76, 1],  9  => [42, 64, 72, 1],
    10 => [40, 60, 66, 2], 11  => [36, 54, 58, 2], 12  => [32, 46, 50, 3],
  }.freeze,
  "high_solids" => {
    1  => [18, 26, 30, 0],  2  => [30, 48, 58, 0],  3  => [46, 70, 82, 0],
    4  => [54, 82, 92, 0],  5  => [56, 84, 94, 1],  6  => [54, 80, 88, 1],
    7  => [50, 72, 80, 2],  8  => [46, 66, 72, 2],  9  => [40, 56, 62, 3],
    10 => [34, 48, 52, 3],
  }.freeze,
}.freeze
OPTIMAL_RANGES = 
{
  "acrylic_zinc_low"          => [3, 5,  8],
  "acrylic_zinc_medium"       => [5, 6,  9],
  "acrylic_zinc_high"         => [6, 7, 10],
  "acrylic_zinc_extreme"      => [7, 7, 10],
  "acrylic_no_metal_low"      => [3, 4,  8],
  "acrylic_no_metal_medium"   => [5, 6,  9],
  "acrylic_no_metal_high"     => [6, 7, 10],
  "acrylic_no_metal_extreme"  => [6, 7, 10],
  "high_solids_low"           => [2, 3,  6],
  "high_solids_medium"        => [3, 4,  7],
  "high_solids_high"          => [4, 5,  8],
  "high_solids_extreme"       => [4, 5,  8],
}.freeze
REPAIR_SCORES = 
{
  1  => [1,  false, true,  "easy",      18],
  2  => [3,  false, true,  "easy",      20],
  3  => [6,  true,  false, "easy",      22],
  4  => [8,  true,  false, "easy",      24],
  5  => [9,  true,  false, "easy",      26],
  6  => [9,  true,  false, "moderate",  30],
  7  => [8,  true,  false, "moderate",  34],
  8  => [6,  true,  false, "moderate",  38],
  9  => [4,  false, true,  "hard",      45],
  10 => [2,  false, true,  "hard",      52],
  11 => [2,  false, true,  "very_hard", 60],
  12 => [1,  false, true,  "very_hard", 65],
  13 => [1,  false, true,  "extreme",   78],
  14 => [1,  false, true,  "extreme",   85],
  15 => [1,  false, true,  "extreme",  100],
}.freeze
HEAT_RISK_LABELS = 
%w[low medium high very_high].freeze
COF_DATA = 
{
  "acrylic_zinc" => {
    0  => [0.62, 0.55], 1  => [0.58, 0.50], 2  => [0.56, 0.47], 3  => [0.55, 0.45],
    4  => [0.54, 0.44], 5  => [0.52, 0.42], 6  => [0.51, 0.40], 7  => [0.50, 0.39],
    8  => [0.49, 0.37], 9  => [0.48, 0.36], 10 => [0.47, 0.35],
  }.freeze,
  "acrylic_no_metal" => {
    0  => [0.63, 0.56], 1  => [0.60, 0.52], 2  => [0.58, 0.50], 3  => [0.57, 0.48],
    4  => [0.56, 0.47], 5  => [0.54, 0.45], 6  => [0.53, 0.43], 7  => [0.51, 0.41],
    8  => [0.50, 0.39], 9  => [0.49, 0.38], 10 => [0.48, 0.37],
  }.freeze,
  "high_solids" => {
    0  => [0.62, 0.55], 1  => [0.57, 0.49], 2  => [0.55, 0.46], 3  => [0.53, 0.43],
    4  => [0.51, 0.41], 5  => [0.50, 0.39], 6  => [0.49, 0.37], 7  => [0.47, 0.35],
    8  => [0.46, 0.34],
  }.freeze,
}.freeze

Class Method Summary collapse

Class Method Details

.assess_coat_count(finish_type:, traffic_level:, coat_count:) ⇒ Hash

Assess a VCT finish coat count program.

Parameters:

  • finish_type (String) —

    “acrylic_zinc” | “acrylic_no_metal” | “high_solids”

  • traffic_level (String) —

    “low” | “medium” | “high” | “extreme”

  • coat_count (Integer) —

    current number of finish coats

Returns:

  • (Hash) 


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# File 'lib/vct_finish_layer_count_2026.rb', line 113

def assess_coat_count(finish_type:, traffic_level:, coat_count:)
  ft = finish_type
  tl = traffic_level
  cc = coat_count.round

  ft_data = BURNISH_DATA.fetch(ft) { raise ArgumentError, "Unknown finish_type: #{ft}" }
  bkey = clamp_key(ft_data.keys, cc)
  gi, g1, g3, hri = ft_data[bkey]

  rep_key = clamp_key(REPAIR_SCORES.keys, [[cc, 1].max, 15].min)
  score, spot_viable, strip_required, strip_diff, strip_time = REPAIR_SCORES[rep_key]

  mn, mx, trigger = OPTIMAL_RANGES.fetch("#{ft}_#{tl}", [4, 7, 10])
  to_trigger = [trigger - cc, 0].max

  if cc < mn
    action = "add_coats"
    notes  = "Floor is under-coated. Optimal range for #{tl} traffic (#{ft.gsub('_', ' ')}) is #{mn}–#{mx} coats. Add #{mn - cc} coat(s) before next burnish."
  elsif cc <= mx
    action = "maintain"
    notes  = "Coat count is within optimal range (#{mn}–#{mx}) for #{tl} traffic. Strip cycle triggered at #{trigger} coats (#{to_trigger} coats remaining). Continue scheduled program."
  elsif cc < trigger
    action = "plan_strip"
    notes  = "Coat count exceeds optimal range. Schedule strip-and-refinish within next maintenance cycle. #{to_trigger} coats remaining before strip trigger."
  else
    action = "strip_now"
    notes  = "Strip trigger reached (#{cc} coats). Full strip cycle required. Expect #{strip_diff} strip (#{strip_time} min/1,000 sq ft)."
  end

  {
    finish_type:   ft,
    traffic_level: tl,
    coat_count:    cc,
    burnish_response: {
      gloss_initial: gi,
      gloss_1pass:   g1,
      gloss_3pass:   g3,
      rating:        burnish_rating(g3),
      heat_risk:     HEAT_RISK_LABELS[hri],
    },
    repairability: {
      score:                    score,
      spot_repair_viable:       spot_viable,
      strip_required:           strip_required,
      strip_difficulty:         strip_diff,
      strip_time_per_1000sqft:  strip_time,
    },
    recommendation: {
      action:                action,
      optimal_range:         [mn, mx],
      coats_to_strip_trigger: to_trigger,
      notes:                 notes,
    },
  }
end

.assess_cof(finish_type:, coat_count:, zone_type: "dry_general") ⇒ Hash

Assess COF compliance for a finished VCT floor.

Parameters:

  • finish_type (String)
  • coat_count (Integer)
  • zone_type (String) (defaults to: "dry_general") —

    default “dry_general”

Returns:

  • (Hash) 


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# File 'lib/vct_finish_layer_count_2026.rb', line 175

def assess_cof(finish_type:, coat_count:, zone_type: "dry_general")
  ft = finish_type
  cc = coat_count.round
  zt = zone_type

  ft_data = COF_DATA.fetch(ft) { raise ArgumentError, "Unknown finish_type: #{ft}" }
  ckey = clamp_key(ft_data.keys, cc)
  dry, wet = ft_data[ckey]

  high_zone   = %w[accessible_route healthcare_wet].include?(zt)
  wet_thresh  = high_zone ? 0.60 : 0.50
  diff        = wet - wet_thresh

  slip_risk =
    if    diff >= 0.08  then "low"
    elsif diff >= 0.02  then "medium"
    elsif diff >= -0.02 then "medium_high"
    elsif diff >= -0.08 then "high"
    else                     "very_high"
    end

  threshold_met = high_zone ? wet >= 0.60 : wet >= 0.50
  action_required =
    if    threshold_met && dry >= 0.50 then "none"
    elsif dry >= 0.50 && wet >= 0.44   then "monitor"
    elsif cc >= 9                       then "strip_and_retreat"
    else                                     "anti_slip_treatment_required"
    end

  {
    finish_type:          ft,
    coat_count:           cc,
    zone_type:            zt,
    static_cof_dry:       (dry * 100).round.to_f / 100,
    static_cof_wet:       (wet * 100).round.to_f / 100,
    passes_osha_dry:      dry >= 0.50,
    passes_nfpa_wet:      wet >= 0.50,
    passes_csa_accessible: dry >= 0.60,
    passes_obc_healthcare: wet >= 0.60,
    slip_risk_rating:     slip_risk,
    action_required:      action_required,
  }
end

.burnish_rating(g3) ⇒ Object 



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# File 'lib/vct_finish_layer_count_2026.rb', line 99

def burnish_rating(g3)
  if    g3 >= 85 then "excellent"
  elsif g3 >= 70 then "good"
  elsif g3 >= 55 then "fair"
  else                "poor"
  end
end

.clamp_key(keys, n) ⇒ Object 



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# File 'lib/vct_finish_layer_count_2026.rb', line 95

def clamp_key(keys, n)
  keys.min_by { |k| (k - n).abs }
end