Is It Okay to Put Two Layers of Shingles on a Roof?

Homeowners frequently consider the addition of the two layers to a roof to help save time and cost in roofing tasks. But Is It Okay to Put Two Layers of Shingles on a Roof? While it could be appealing, layering shingles has the potential for risks as well as benefits. This guide explains whether roofing shingle laying is a wise choice with a discussion of pros and cons, as well as professional advice to help you make the right choice!

What Does Two Layers of Shingles Mean?

“Roof overlay” is the process of installing new shingles on top of an existing layer, and avoiding the hassle of tearing away the old ones. As opposed to a full roofing replacement, which requires the removal of all shingles in order to examine the roof deck, roofing overlays can be seen as a more cost-effective, quicker alternative. Many homeowners opt for double-shingle roofing to save money; however, it’s not the best option for long-term solutions.

Pros of Two Layers of Shingles

The addition of 2 layers of roofing to the roof can provide some benefits:

• Cost-effective:
  Cutting down on tear-offs can reduce the cost of disposal and labor.
• Time efficient:
  Overlays perform quickly than replacements that are complete, which reduces disruption.
• Temporary fix:
  If done correctly, an additional layer may extend the lifespan of a roof by several years.

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Cons of Two Layers of Shingles

Yet, roof shingle layering is not without its drawbacks.

• Adds Weight:
  The extra shingles strain the roof’s structure, posing a risk of falling.
• Hidden damage:
  Leaks from the past or rot are not visible and get worse over time.
• Longer life span:
  New shingles could wear more quickly when the base is uneven.
• Warranty Problems:
  Some manufacturers cancel warranties on overlays.
• Resale concerns:
  Home inspectors frequently signal roofing with double shingles and discourage buyers.

The risks are greater than the savings in the short term.

Building Codes & Regulations

Local building codes differ on the 2 layers of roofing that are placed on the roof. Certain regions allow an additional layer, while others ban overlays completely. Insurance companies could be concerned, since the layers can mask problems. Always consult with a professional roofing contractor to make sure that you are in compliance with local laws before taking any action.

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When Is a Second Layer Acceptable?

The layering process can be effective under certain conditions:

• The decking on the roof is in great condition, without damage or rot.
• There’s not any structural weaknesses.
• There is only one shingle layer (never add another).
• It’s a temporary solution to budgetary constraints.

These situations allow double-shingle roofing to be possible, but being cautious is the key.

When to Avoid Two Layers

Do not apply the roof shingle layering if:

• The house is older and has framing for the roof that is weaker.
• Shingles that are currently in use show curling the moss is damaged, or there is a significant amount of damage.
• The area has a lot of snow/wind, which may strain the house.

In such cases, the full tear-off is more stable and would be less expensive in the long run.

The Bottom Line

Is It Okay to Put Two Layers of Shingles on a Roof? Installing two layers of shingles on a rooftop can be a temporary solution in certain situations, yet it is not usually the most desirable option. The incremental weight, latent damage, and warranty faults usually overshadow savings. A professional inspection will help you make the right decision. A2ZRoofing provides professional inspections to help you determine whether to overlay or replace a roof. Get a roof evaluation or custom roofing services today!