Is a 20-Year-Old Roof Too Old to Repair?

Twenty-year-old roofs in Greater Victoria are the roofs installed around 2005–2006: the first roofs on early Bear Mountain and the Langford hillsides, replacement roofs on 1970s Sidney ranchers, and the second roof on a lot of Saanich split-levels. The Bear Mountain and Sidney roofs sit in sun and wind and are often in reasonable shape at 20. The Saanich, Highlands and Metchosin roofs under Douglas fir and Garry oak are frequently done, because a north slope that stays damp from October to April ages roughly as fast as the contractor's 15–22 year figure suggests.

The tell is usually in the gutters. Victoria homeowners who clean gutters each fall notice the year the granules start arriving in quantity; that is the year the shingle mat begins to weather bare. If your 20-year-old roof still holds its colour on the south slope and the north slope has been kept clear of moss, a repair is a reasonable bet. If the south slope has gone dark and patchy, the shingles are brittle and a repair crew may break more than they fix.

For laminate asphalt, 20 years is the start of the end-of-life window, and our engine counts that as one replacement signal on its own. For cedar shakes, 20 years is mid-life for a well-maintained roof (Paragon's BC guide gives 18–25 years maintained and 12–15 unmaintained), so repairs on cedar at 20 depend almost entirely on how the roof was cared for. For metal, 20 years is early: fasteners and sealant at penetrations may need attention, but the panels themselves have decades left. For 2-ply torch-on on a flat section, 20 years is the middle of a 20–30 year range and seam or drain repairs are normal.

• Asphalt at 20: inside the end-of-life window; repair only if the rest of the roof is sound
• Cedar at 20: repairable if kept clean and ventilated; replace if shakes are split and mossy
• Metal at 20: repair; look at fasteners, sealant and flashings
• Torch-on at 20: repair seams, blisters and drains; plan replacement within a decade

A single failed pipe boot, a lifted piece of step flashing at a wall, or a skylight reseal are all cheap (roughly $250–$1,500 in our repair menu) and do not depend on the surrounding shingles being flexible. These are worth doing at 20 even on a tired roof, because they stop water now while you plan.

A section repair, where a crew replaces one slope area with new matching shingles, is a different matter. At 20 years the original product line is often discontinued, the new shingles will not match, and the old shingles around the patch crack when lifted. In our engine a $4,000 section repair on a 22-year-old roof is 46% of replacement and trips the 35% rule; combined with the age signal that is enough for a replacement evaluation.

Enter age, material, repair history, recent leaks and the repair quote into the repair-or-replace tool. It returns remaining life, the repair's share of replacement, and 1, 5 and 10-year cost paths. For the 20-year-old example with a $1,500 repair, the repair path is $1,500–$14,100 over one year and $10,200–$21,300 over ten years; the replace path is $6,900–$13,100. If you are staying, the ten-year view is the one that matters. If you are selling within two years, the one-year view plus honest disclosure is usually the practical choice.

Ask for a written condition summary with photos of each slope, the state of granules, any curling or cracking, moss cover, flashing condition at every penetration, and what the attic sheathing looks like from below. Many roofers credit an inspection fee ($150–$400 in our menu) against a later quote. With that summary in hand, the 'too old' question usually answers itself.