First, name your grey
Hold a white paper and a known blue against your siding in daylight. If the grey looks slightly blue or green, it is cool. If it looks a little beige or brown, it is a warm grey, sometimes called greige. Then judge its value: light, mid or dark. These two facts narrow the roof choice quickly.
Roof pairings by shade
The general rule is to keep the roof darker than the walls and on the same side of warm or cool. Exceptions exist, but this rule rarely fails.
- Light cool grey: black or charcoal roofs for contrast, or a weathered grey blend for a softer look.
- Light warm grey: weathered grey or driftwood blends that carry a little brown.
- Mid grey: charcoal or black. A mid grey roof on mid grey siding can make the house look flat.
- Dark grey or charcoal: black roofs work on modern forms; on traditional houses a slightly lighter weathered grey keeps the roofline visible.
- Blue-grey: black, charcoal or a cool estate grey blend. Avoid brown roofs.
Shingles versus metal on grey houses
Shingle blends add texture and slight color variation, which suits lap siding and traditional houses. Standing seam metal in charcoal or black gives a cleaner line and suits board and batten and modern farmhouse designs. Silver or unpainted-look metal on grey siding can work on contemporary houses, though it reflects sky and changes color through the day.
If you have stone on the front, look at it closely. Grey stone often has brown or rust in it; a charcoal roof with a slight brown base will tie stone and siding together better than a pure black.
Light, orientation and climate
On a north-facing house, cool greys read even cooler and a black roof can look heavy. A weathered grey blend may feel lighter. On a south or west face, strong light washes out pale greys and the contrast with a dark roof looks crisper.
Shadows from trees and neighboring houses also shift greys. Look at a sample shingle bundle and a siding board together at the time of day you usually see the front of the house.
In most of Canada and the northern US, a dark roof is not a meaningful energy penalty compared with insulation and ventilation choices, so you can pick on looks. Where summers are long and hot, a lighter roof is worth considering.
Trim, gutters and fixed details
With grey siding, white trim and a dark roof give a classic three-step contrast. Charcoal or black trim with a black roof is more modern but can make the house feel heavy if the siding is mid grey. Match gutters to the trim and downspouts to the siding.
Do not forget the driveway and walkway. Concrete tends to read warm grey and asphalt dark grey; both sit closer to some roof colors than others. A charcoal roof with grey siding over a light concrete drive tends to look balanced, while a brown roof can look out of place with cool grey concrete.
