Current California Inventory
Synthetic roof underlayment
Check current synthetic underlayment rolls, confirm coverage and quantity, then call the yard closest to your job before pickup.
A Better Starting Point
Buy the roll that fits the roof plan.
Underlayment sits below the shingles, but it should not be treated like an afterthought. The roll needs to suit the shingle system, roof area, roof details, and installation plan. Affordable Roof Supply lists synthetic underlayment with stated roll coverage, a current price, and the yard where it is available, so customers have a useful starting point before they drive over.
For many reroofs, synthetic underlayment is part of the field material list. That list can also include shingles, starter material, ridge cap, flashing, fasteners, vents, and weather protection where the project calls for it. Bringing the list together before pickup helps prevent the familiar problem of having the main shingle order ready while a smaller material holds the job up.
Listed stock can move. A quick call lets the yard confirm the exact product, coverage, quantity, price, and location before you leave. It also gives you a chance to compare the roll on hand with the material details from your installer or the roofing system you are using.
Current Underlayment Rolls
Start with real listed inventory.
Affordable Roof Supply currently lists synthetic felt in 1,000-square-foot rolls at all three yards, along with a FeltBuster synthetic roofing felt roll in Ripon. The exact product, stated coverage, and yard availability matter more than a generic category name, so confirm the details before pickup.
A roll count is only useful when it is tied to the adjusted roof area and the instructions for the materials being installed. Valleys, hips, ridges, penetrations, transitions, overlaps, and areas that need weather protection can all change the material list. Use the coverage printed for the selected product and follow the installation requirements for the shingle system.
If you are unsure whether a particular synthetic roll is the right fit, bring the product name, roof measurement, and any installer notes when you call. The yard can check current stock, while the installer or product instructions should guide the final system choice.
Listed Inventory
See the synthetic underlayment currently listed.
Product listings show a useful starting point. Call the yard before pickup to confirm current price, roll coverage, quantity, and availability.
Before You Call
Have the details that make a material check useful.
Start with the roof area, not the number of rolls someone used on a different job. A roof measurement creates the base for the material list, then the selected product and installation plan determine how that area is covered. The roof measurement guide can help you organize the roof planes and turn them into a clearer starting area before you call.
Next, keep the shingle information nearby. Underlayment is part of a roofing system, so the manufacturer instructions for the selected shingle and the job requirements take priority over a generic rule of thumb. Share the shingle brand or product line, roof pitch if you know it, and any notes from the installer. That context helps distinguish a simple stock question from a material mismatch.
It also helps to separate field underlayment from local protection details. A broad field layer beneath the shingles is not automatically the same product or quantity used around valleys, eaves, walls, chimneys, skylights, or other transitions. Affordable Roof Supply lists Ice & Water SA separately, and a project can need both a field underlayment roll and a different protection material where the roof design calls for it.
Check the unit on every listing. Roll coverage, square feet, bundle counts, boxes, and linear feet describe different things. A clean material list keeps them on separate lines. That makes it easier to compare a listed product with the order your project actually needs and reduces the chance of ordering enough shingles while overlooking a separate roof component.
Finally, decide which yard makes sense before you make the trip. Synthetic felt is listed at Ripon, Sacramento, and Fresno, but quantity and current availability can change by location. Use the yard locations page to choose the closest place, then call that yard with the product, quantity, and timing you need.
For Repairs And Reroofs
Keep the material conversation tied to the job.
A smaller repair can look simple from the ground but still involve details that change the material plan. The damaged area may reveal deck condition, flashing needs, or a section where the existing layers have to be handled carefully. Do not assume that one roll or one product is the answer just because the repair area is small. Let the person doing the work confirm the system and quantities before you buy.
A full reroof needs a broader view. Field shingles are only one part of the order, and underlayment coverage should be considered alongside waste, starter, ridge cap, ventilation, fasteners, flashing, and any protection details on the roof. The roof underlayment guide explains the role of synthetic underlayment, traditional felt, and self-adhered protection so you can have a more practical conversation about the options.
When you compare prices, compare the same thing. A less expensive roll is not automatically a better value if the stated coverage, product requirements, or job suitability are different. Confirm the full product name, the coverage shown on the listing, current quantity, and whether it fits the plan before you count it as part of the order.
Affordable Roof Supply can help you check the listed inventory and direct you to the yard with the product on hand. It is still smart to keep the final material selection with the roofing professional and the applicable product instructions. That keeps a convenient pickup from becoming a preventable problem after installation starts.
Frequently Asked Questions
Synthetic roof underlayment questions
How much synthetic underlayment comes in a roll?
Check the stated coverage on the specific listed product. Affordable Roof Supply currently lists synthetic felt in 1,000-square-foot rolls, but call the yard to confirm the exact product and current availability.
Can synthetic underlayment be used beneath shingles?
Synthetic underlayment is commonly used beneath asphalt shingles. The product that belongs on a roof depends on the shingle system, roof design, project requirements, and manufacturer instructions.
How many underlayment rolls do I need?
Start with the adjusted roof area, then use the stated coverage and installation requirements for the specific product. Account for the roof details and separate materials that may be needed beyond the field layer.
Do all three yards have synthetic felt?
Synthetic felt is currently listed at Ripon, Sacramento, and Fresno. Inventory can change, so call the yard you plan to visit before pickup.
Should I call before I drive to the yard?
Yes. Confirm the roll, stated coverage, listed price, available quantity, and yard location before making the trip.
Ready To Check Stock?
Choose the yard closest to the job.
Call with the product name, roof area, and quantity you need.