Synthetic Underlayment
A woven or non-woven polypropylene roof underlayment that is lighter, stronger, and more slip-resistant than traditional felt paper. Increasingly required by shingle manufacturers.
A woven or non-woven polypropylene roof underlayment that is lighter, stronger, and more slip-resistant than traditional felt paper. Increasingly required by shingle manufacturers.
Why Synthetic Underlayment Matters for Insurance Claims
Synthetic underlayment has become the default choice for new roof installations because major shingle manufacturers require it for their top-tier warranty programs. When a roof is replaced due to storm damage, using synthetic underlayment may be necessary to activate the manufacturer warranty on the new shingles. This makes it a justifiable line item even if the original roof had felt paper, as the warranty requirement creates a legitimate need for the upgraded material.
Synthetic Underlayment in Xactimate Estimates
Synthetic underlayment has separate selector codes from felt paper in Xactimate and is priced higher per square. The estimate should specify synthetic underlayment when the replacement shingles require it for warranty compliance. Measure the full roof area minus any areas covered by ice and water shield (which is a different product). List synthetic underlayment as its own line item, not combined with other materials.
Performance Advantages
Synthetic underlayment does not absorb water, which means it protects the roof deck even if shingle installation is delayed by weather. It lies flatter than felt paper, creating a smoother surface for shingle installation. It is also lighter, which reduces the load on the roof structure and makes handling easier for the installation crew. These performance benefits translate to a better-quality finished roof, which supports the use of synthetic underlayment in insurance-funded re-roof projects.
Frequently asked questions
For most applications, yes. Synthetic underlayment is stronger, lighter, more slip-resistant for worker safety, and does not absorb water. Many shingle manufacturers require it for their enhanced warranty coverage, making it a practical necessity on new installations.
If the shingle manufacturer requires synthetic underlayment for warranty compliance on the replacement shingles, the cost is justified in the estimate. If synthetic is not required, insurance pays for like kind and quality, which would be felt paper.
Most synthetic underlayment products have a UV exposure rating of 3 to 6 months, depending on the manufacturer. This is significantly longer than felt paper, which deteriorates within weeks of UV exposure. However, shingles should be installed as soon as practical.
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