Ask what is beneath the roof covering
Your estimate may name felt, synthetic, or self-adhered underlayment. Before choosing among those labels, ask the contractor to identify the exact product and show where it fits in the proposed roof assembly. Request a sample or diagram if the terminology is unfamiliar. The useful decision is whether the specified product and installation suit your project, not which broad category sounds strongest in a sales presentation.
Compare the actual products
For each option, request the manufacturer’s current application instructions and ask the estimator to explain the relevant conditions. Ask whether the roof covering, slope, deck surface, or other proposed materials affect the selection. Have the contractor identify what must be confirmed with the local permitting authority.
- What preparation is specified before this product is installed?
- Where on the roof will it be used?
- How are seams, roof edges, and penetrations addressed?
- What limits apply during exposure before the covering is installed?
- What documentation will be kept before this layer is concealed?
Make the selected assembly part of the agreement
Ask the proposal to identify the product rather than simply say upgraded underlayment. If the plan uses different products in different areas, request a clear explanation of that arrangement and the supporting instructions. Keep any insurance questions separate and seek the insurer’s written response to the proposed details. You should leave the discussion knowing what is planned, why it was selected, and where to find the documentation behind the recommendation.
Understand the layer beneath the roof covering.
Underlayment sits beneath the visible roof covering as part of the specified assembly. Felt, synthetic and self-adhered products are different categories, not interchangeable promises. Compare the exact product, installation requirements and compatibility with the rest of the proposed roof.
Understand how the layers connect
The underlayment, roof covering, flashing and edges must be considered together. Ask how the selected system handles valleys and penetrations. If an upgrade is offered, request a clear explanation of the assembly change and the added work.
Read the supporting guidance: TAMKO application instructions and warranty documents · IBHS: roof flashing
