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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


  • Can a slate roof be repaired?

    ABSOLUTELY YOU CAN REPAIR A SLATE ROOF! Sometimes a slate roof can be damaged by stress cracks, over nailing, foot traffic, fallen tree limbs and inclement weather. A slate roof can last 100 plus years so when a few pieces or a section of the roof is damaged, it’s worth repairing. More importantly, finding an experienced contractor will ensure the repair is done properly and not repaired with a roofing cement which doesn’t last and makes future repairs difficult. An experienced slate roofer will be able to match the existing color, and identify the size and thickness. The rule of thumb is if 20-30% of the slates are damaged, it’s better to replace the entire roof. CONTACT US for an experienced slate roof specialist in your area.