06/16/2026
Thinking about laying new shingles directly over your old roof to save a quick buck? 🛑 Hold that shovel! 🛠️
In Ontario, while the building code technically allows for up to two layers of shingles in some scenarios, a complete tear-off is almost always the right call. Here is why cutting corners on a "roof-over" can cost you thousands down the road:
1️⃣ Hidden Damage: You can’t see what’s under the old shingles until they’re off. We frequently pull back layers only to find soft, rotten plywood decking underneath. Layering over it just hides the problem until your roof begins to sag.
2️⃣ Trapped Heat & Moisture: Two layers trap extreme heat and moisture in your attic. This cooks your new shingles from the inside out, causing them to warp, buckle, and fail prematurely.
3️⃣ Voided Warranties: Many top shingle manufacturers will limit or entirely void their lifetime warranties if the shingles aren't installed over a clean, flat, properly prepared deck.
4️⃣ Extra Weight: Double the shingles means double the weight on your home’s structural framing—especially dangerous during heavy Ontario winter snowfalls. ❄️
Don't pay twice for the same roof. Invest in a quality, full tear-off installation that protects your home for decades. 🏡✨
🔗 Head to the link in our bio to read our full breakdown:
https://www.google.com/maps/place/C.D.+Roofing+%26+Construction+Ltd./@43.8588148,-78.9235345,17z/data=!4m4!3m3!1s0x0:0xf8bc5748d9cd4460!11m1!2e1?hl=en&entry=ttu&g_ep=EgoyMDI2MDYxMC4wIKXMDSoASAFQAw%3D%3D
https://www.google.com/maps/place/C.D.+Roofing+Scarborough/@43.8173043,-79.2728601,11z/data=!4m4!3m3!1s0x0:0xef4affa9b20179af!11m1!2e1?hl=en&entry=ttu&g_ep=EgoyMDI2MDYxMC4wIKXMDSoASAFQAw%3D%3D
Need an honest assessment? Call us at 905-430-7911 for a FREE, no-pressure estimate!