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3 Things to Consider When Repairing an Existing Slate Roof


Does the existing slate appear to be Semi-Weathering or Unfading?

Semi-Weathering slates will most likely exhibit a percentage of color change to buff, brown and tan over time.

Unfading slates will least likely exhibit color change over time.

It is important to note that over a long period of time (75-100 years) unfading slates may appear to lighten or mellow in color due to environmental pollutants.

Note: If you are able to remove an existing piece of slate and look at the underside, it usually helps depict the original / historical color the best.

Not sure what color of slate you are trying to match? Email a photo to info@ncslate.com and will let you know what North Country Slate color might provide the best match.


What is the length(s) and width(s)?

Measure the length and width of the slate(s) you are looking to replace.

If you are unable to get the exact measurements of a full-size slate it may be helpful to consider measuring the slate exposure and width to help estimate the length of slate from our schedule of standard sizes chart. Example: Depending on the headlap a 6.5” exposure may correlate to a 16” length.


What is the thickness(es)?

Measure the bottom (butt) of the slate(s) you are looking to replace.

Standard thicknesses

– 3/16”
– 1/4”
– 1/4”-3/8”
– 3/8”-1/2”
– 1/2”-3/4”
– 3/4″ +

Slate Thickness and Weights

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