Roofing education
Plain-language answers to the questions homeowners on Vancouver Island ask us most.
How long does an asphalt shingle roof last?
Lifespan depends on the product, the quality of installation, ventilation, sun exposure and maintenance. On the coast, constant moisture and moss growth can shorten a roof's life considerably if they are left unmanaged. The age on paper matters less than the condition you can see.
Ridge and ridge vent
Cracked, loose, or missing ridge caps and warped vent strips allow water, snow, and pests directly into the attic. This compromises ventilation and leads to leaks, mold, and wood rot at the roof's peak.
Visible daylight in the attic
Visible daylight through attic roof boards indicates direct openings in the roofing deck. This allows immediate water intrusion, pest infestation, and severe energy loss.
Sagging between rafters
Sagging between rafters signals rotting, saturated, or structurally compromised roof decking. Left untreated, the weakened decking can collapse under heavy loads, requiring extensive structural repairs.
Shingles and underlayment
Curled, cracked, lifted, or missing shingles signal severe weathering and age. This compromises the roof's water barrier, exposing the structure to leaks, moisture intrusion, and rot.
Eaves, drip edge and gutters
Granules in gutters signal severe shingle erosion, exposing the underlying asphalt to UV damage. This accelerates roof degradation and greatly increases the risk of leaks.
Thick moss mats
Moss mats trap moisture and lift shingles, forcing water underneath. This accelerates wood rot and roof decking failure.
Interior damage
Water stains or musty smells indicate active, hidden roof leaks and trapped moisture. Unaddressed, this causes attic mold growth, insulation failure, and costly structural damage.
Warning signs worth a closer look
- Shingles that are curling, cracked, lifted or missing.
- Granules collecting in gutters or at the bottom of downspouts.
- Thick moss mats, especially on north-facing slopes.
- Stains on ceilings or in the attic, or a musty smell upstairs.
- Daylight visible through roof boards from inside the attic.
- Sagging between rafters, which can indicate deck damage.
Repair or replace?
A repair makes sense when damage is limited and the rest of the roof is sound. Replacement makes more sense when problems are widespread, when the roof is near the end of its service life, or when repeated repairs are adding up. We will show you photographs of what we find so you can make the decision with us.
Choosing a roofing material for the West Coast
Asphalt shingles are the most common choice on Vancouver Island. Architectural (laminated) shingles are thicker than older three-tab shingles, resist wind better and come in many colours. Many lines now include algae-resistant granules, which helps in our damp climate.
Metal roofing costs more at the start but sheds rain and moss well, is light, and lasts a long time. Standing seam panels hide their fasteners, which removes a common source of leaks.
Cedar shakes give a traditional look that suits many island homes. They need more maintenance than other materials and, in many areas, attention to fire-resistance ratings.
Low-slope and flat roofs cannot use shingles. They need a membrane system, such as torch-on (SBS modified bitumen) or a single-ply membrane, installed so water drains rather than pools.
Moss and roof care
Moss holds water against the roof and lifts shingle edges, letting wind-driven rain underneath. Treat it before it forms thick mats, using a method the shingle manufacturer approves. Avoid pressure washing asphalt shingles, which strips their protective granules. Keeping overhanging branches trimmed lets the roof dry faster after rain.
Why ventilation and underlayment matter
An attic that cannot breathe traps warm, moist air, which condenses on the underside of the roof deck through the winter and can lead to mould and rot. Good intake and exhaust ventilation, together with modern underlayment and properly installed flashing, protect the parts of the roof you never see.
What affects the price of a new roof?
- The size and pitch of the roof. Steep roofs take longer and need more safety equipment.
- The material you choose.
- How many layers of old roofing have to be removed.
- The condition of the roof deck under the old roofing.
- Chimneys, skylights, valleys, dormers and other details.
- Access for equipment and for removing old materials.
For a quick idea, our instant roof estimate measures your roof from satellite imagery. For an exact price, we give a free written estimate after looking at the roof.
What happens during a tear-off?
The existing roofing is removed down to the deck, the deck is inspected and any damaged sheathing is replaced, then new underlayment, flashing, ventilation and shingles are installed. The site is protected throughout and cleaned at the end, including a magnetic sweep for nails.
How to read a roofing estimate
A good estimate names the products being installed, describes the scope of work, explains how damaged decking will be handled and priced if it is found, states which permits are included, and sets out both warranties. If any of those are missing, ask before you sign.
When is the best time to replace a roof on Vancouver Island?
Late spring through early fall gives the most dry days, so it is the busiest season and the easiest to schedule around the weather. Roofs can still be replaced in fall and winter by working between rain systems and making the roof watertight at the end of every day. If your roof is leaking, do not wait for summer: a temporary repair now can prevent damage to the deck, insulation and ceilings.
Chimneys, skylights and other weak spots
Most leaks start where something passes through the roof or where two slopes meet, not in the middle of the shingles. Chimneys, skylights, plumbing vents, valleys and walls that meet the roof all rely on metal flashing and sealants. When a roof is replaced, these details should be rebuilt with new flashing rather than reused, because old flashing and sealant rarely last as long as a new roof.
Storm damage and insurance
After a windstorm, look for shingles in the yard, lifted tabs, exposed underlayment and dented flashing. Take photographs from the ground and do not climb onto a wet or damaged roof. Home insurance usually covers sudden storm damage but not wear and tear, so a record of what happened and when helps your claim. We can secure the roof first and document the damage for your insurer.
Questions to ask any roofer
- Are you registered with WorkSafeBC, and can you provide a clearance letter? If a contractor is not in good standing, the person who hired them can be held responsible for unpaid premiums.
- What liability insurance do you carry?
- Will the old roof be removed down to the deck, and how is damaged decking priced?
- Which products will be installed, and will the installation qualify for the manufacturer's warranty?
- How long is your workmanship warranty, and is it in writing?
- Who looks after permits, if they are needed?
Looking after your roof
- Look at your roof from the ground each spring and fall, and after big windstorms.
- Clean gutters at least once a year, usually after the leaves drop.
- Check the attic for stains, damp insulation or daylight.
- Fix small problems early; they rarely get cheaper with time.