Deciding how to tackle a roof replacement comes down to two main paths. You either strip the old layers down to the bare wood deck, or you nail a fresh layer of shingles right over the top. Around Billings, where sudden spring storms and heavy winter snow packs put serious stress on our homes, property owners ask which approach is better all the time. The comparison of these methods involves several factors when you factor in our local climate.
The Upfront Cost Difference
Saving money on the front end is usually why homeowners look at roof overlays. Leaving the old shingles in place saves hours of heavy labor and disposal fees at the Yellowstone County landfill. You can easily knock twenty to thirty percent off the initial project bid by going this route.
A complete tear-off costs more because our crew has to haul away tons of old debris, inspect the plywood decking for rot, and replace damaged wood before laying down any new materials. But upfront savings can quickly evaporate if your roof structure is not ready to handle the extra weight.
Weight and Montana Weather Stress
Asphalt shingles are heavy. Putting a second layer on top means your roof joists have to support double the load. That extra weight causes problems when a heavy wet snowstorm dumps two feet of snow across the Heights or the West End. That extra weight adds up fast, increasing the risk of sagging or structural strain over time.
A full tear-off gives us a clean slate to install proper underlayment, ice and water shield, and ventilation. Billings experiences massive temperature swings thanks to chinook winds, which love to create ice dams if your roof is not venting correctly. Stripping the old roof lets us catch soft decking or hidden leaks that a roof overlay would just trap and hide.
Longevity and Manufacturer Warranties
If you plan on selling your house in a couple of years, a roof overlay can offer a clean look on a budget. Just keep in mind that most shingle manufacturers will not honor their full material warranties if you install their product over an existing layer of shingles.
When Billings Roofing Company handles a complete tear-off, you get the full backing of the manufacturer warranty plus a system built to last decades rather than years. Trapping old, curling shingles underneath a new layer also telegraphs imperfections right through the new material, affecting appearance and letting wind catch edges much easier.
For homes and businesses in Billings, Billings Roofing Company provides roof replacement services that hold up for many years in the Montana climate.