A straightforward answer to this question is yes. It’s possible to lay new roofing shingles over old ones. But under what circumstances is this approach to roof replacement recommended? In this piece, we aim to discuss when and why this re-roofing option is ideal.
Why is putting new roof shingles over old ones ideal?
Let’s begin touching on the good side of re-roofing. The approach offers a few benefits over tearing off the old roof to install a new one. They include:
- It’s less expensive.
- It takes less time and hassle.
- It offers the same durability and aesthetic effects.
- It may tag along with the same manufacturer’s warranty.
- It comes in handy as added protection during storms.
As outlined above, there are numerous benefits to laying a new roof over an existing one. However, it’s not always recommended.
When does tearing off the old roof become a better option?
Despite the discussed benefits of installing a new roof over an old one, there are circumstances in which we wouldn’t advise going with the re-roofing option. Below are some valid reasons.
You already have another pre-existing layer of a roof under the existing one
In most states, the building codes instruct property owners and roofers to have only two layers of roofing systems at a maximum. If you already have another layer below the current roof, you have no other viable option other than to tear both of them off and install a new roof.
Current roof shingles are already severely damaged
Going with the re-roofing option, the new shingles should sync and lay flat on the old one. This eliminates the possibility of creating entry points for water to sip into the other layers of the roofing system and encourage rotting or mold growth. Your roofer will inspect the condition of the existing shingles and advice best on whether to tear off the roof or go ahead and lay the new roof.
Your current roof leaks
Installing a new roof over a leaking roof often equates to null effort and roof material wastage. We normally would advise that you tear off a leaking roof, fix the already established problem within the roofing system, and install the new roof.
Your existing roofing can’t support the new roof
The underlying foundation of the roofing system should support the new roof. If your current shingles weigh less than what you are planning to install, re-roofing might not be a good idea.
You don’t have to struggle between re-roofing and tearing off your old roof. An experienced roofer will help you make the best decision.
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