As a roof ages, it’s going to require eventual replacement. One common question by Mukilteo homeowners is whether shingle installation can be done over existing shingles. Is this doable, or is this just a temporary band-aid at best? Here are facts regarding shingles and whether you can simply place new ones over the existing tiles.
Why Homeowners Want to Install New Shingles Over Old Shingles
The answer is simple: it costs less. By not having to remove the old shingles, this can save homeowners roughly $1,000 on labor costs, depending on the size of the home. While the money saved is undeniable, this practice is actually counterproductive in the long run.
Too Much Weight
Homes have a roof weight limit. The average shingle weighs roughly four pounds per square foot. By not removing the existing shingles, the weight doubles, possibly surpassing the weight limit. Multiple roof layers lead to the risk of sagging that can occur between the trusses and rafters.
Can’t Evaluate the Underlayment
The underlayment is the section between the shingles and sheathing that safeguards the house from water leaks. If the old shingles are left in place, the contractor won’t be able to inspect the underlayment or even replace it. If the underlayment is damaged, a second layer of new shingles won’t prevent an eventual leak.
Shorter Lifespan
Heat can accumulate between the two layers of shingles with no means of escape. This can lead to the shingles prematurely wearing. In addition, existing mold from the old shingles can spread from the trapped heat and moisture.
Need Shingle Installation For Your Mukilteo Home?
Urbizo Bros Roofing performs home and commercial roof inspections for Mukilteo properties. We have a reputable history of performing shingle installation for various house types. Installation over existing shingles isn’t something we recommend; instead, we strive for long-lasting quality. Contact us to set up an inspection.
Residential Shingle Installation
Quality roof replacement & repair in Edmonds, Seattle, Lynnwood, Mill Creek, Mercer Island, Mukilteo & South Everett
Posted on March 25, 2025 | Published by Ignite Local | Related Local Business