Why We Don't Recommend Adding Another Layer To Your Roof

The backstory: While we take the term “re-roofing” to mean out with the old and in with the new, other companies will install a whole new roof on top of an old one.

So why don’t we do that?

Well, we want to do what’s best for our homeowners.

But here are six other reasons why we advise homeowners not to stick another layer on:

1. Weight: Another layer of shingles adds weight to your roof structure, which could cause structural issues.

2. Hidden Damage: Overlaying shingles can hide problems with the underlying roof deck, such as rot, water damage, or poor ventilation.

3. Shorter Lifespan: The new layer may not last as long as it would if installed directly on the roof deck because it doesn't adhere as well to the old shingles.

4. Poor Ventilation: Two layers of shingles can trap heat and moisture, reducing the effectiveness of roof ventilation, which can accelerate the aging of the new shingles and lead to mold or mildew growth.

5. Voiding Warranty: Many shingle manufacturers' warranties are voided if the shingles are installed over an existing layer.

6. Cost Of Future Work: When the time comes to replace the roof again, you'll have to remove both layers, which can increase labor costs.

While some building codes allow for a second layer, it’s generally better to remove the old roof before installing a new one. This ensures a longer-lasting, more reliable roof.

Need an estimate for your roof? Give us a call to schedule a no-hassle appointment – 804-575-7254.