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Data & figures

2 numbered figures, each drawn from a technical paper on this site and each with its own permalink. Every one carries the table it was built from, so the numbers can be checked rather than trusted.

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Figure 1

Indoor relative humidity against the band hardwood needs

Indoor relative humidity against the band hardwood needsToronto indoor air spends much of the year outside the range hardwood is dimensionally stable in. The shaded band is the safe operating range; the two bars are the seasonal extremes an installed floor actually experiences. The gap between them is why moisture testing, acclimation and expansion gaps are not optional in this city.Safe operating band for hardwood35–55Winter indoor low18–25Summer indoor high60+01530456075% relative humidity

Toronto indoor air spends much of the year outside the range hardwood is dimensionally stable in. The shaded band is the safe operating range; the two bars are the seasonal extremes an installed floor actually experiences. The gap between them is why moisture testing, acclimation and expansion gaps are not optional in this city.

Figure 1 — source data
Condition% relative humidityNote
Safe operating band for hardwood35–55%Where the material is dimensionally stable
Winter indoor low18–25%Heating season
Summer indoor highabove 60%Source states "above 60%" — the upper bound is not published

Source: Climate Mastery — climate reality · Permalink: /data#fig-toronto-indoor-humidity

Figure 2

Janka hardness of the species used in the GTA

Janka hardness of the species used in the GTAResistance to denting, for the five species that account for most Greater Toronto Area hardwood work. Hardness is one variable among several — stability, grain character and finish performance matter equally, and a species chosen on this number alone produces a floor that wears wrong.Hickory1,820Hard maple1,450White oak / European oak≈1,360Red oak (northern)≈1,290Black walnut1,01005001,0001,5002,000Janka rating

Resistance to denting, for the five species that account for most Greater Toronto Area hardwood work. Hardness is one variable among several — stability, grain character and finish performance matter equally, and a species chosen on this number alone produces a floor that wears wrong.

Figure 2 — source data
SpeciesJanka ratingNote
Hickory1,820Extreme durability
Hard maple1,450High-traffic workhorse
White oak / European oak≈1,360Current aesthetic and resale sovereign
Red oak (northern)≈1,290Traditional default
Black walnut1,010Luxury accent

Source: The Intelligent Homeowner's Decision Framework — species · Permalink: /data#fig-janka-hardness-gta

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Screenshot them, embed them, redraw them from the tables. The licence is CC BY 4.0 and the only condition is attribution by URL. Every figure is server-rendered SVG with the underlying table beside it, so nothing here requires JavaScript, and the machine-readable version of the same data is at /api/knowledge.

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