Roofing Shingles & Tiles FAQs
How long do different roofing materials typically last?
Longevity varies: standard asphalt shingles last roughly 15–25 years, architectural shingles can hit 25–30 years, concrete and clay tiles often last 40–70 years, and natural slate can exceed 100 years. Metal roofs usually last 40–70 years depending on the metal and coating.
Can I install a new roof over my existing shingles?
In some cases you can overlay a single layer of asphalt shingles on top of existing shingles, saving on tear-off costs. However, overlays add weight and hide potential underlying problems. Many professionals recommend a full tear-off for accurate deck inspection and longer-lasting results—especially for heavier materials like tiles or slate.
What is a roofing “square” and how do I calculate roof area?
A roofing square equals 100 square feet of roof surface. To estimate roof area, measure the length and width of each roof plane in feet, multiply to find square footage, add all planes together, then divide by 100 to get the number of squares. Always add extra for waste and complex roof features.
How important is ventilation for my roof?
Essential. Proper ventilation prevents excess heat and moisture buildup in the attic, which can shorten shingle life, cause insulation problems, and create mould. A balanced system typically uses soffit intake vents and ridge or exhaust vents to move air through the roof space effectively.
Are there roofing options that are good for energy savings?
Yes. Light-coloured or reflective metal roofs reduce heat absorption and can lower cooling costs. Some modern shingle products also have reflective granules. Additionally, installing good insulation and ventilation complements roofing choices to improve overall energy efficiency.