You’ve got two quotes in front of you.
One’s $9,000. One’s $15,000. Both say they’re replacing your roof with shingles. Both have similar product names in the description.
What’s actually different?
The Material Tier
Asphalt shingles have a wide quality range. Builder-grade 3-tab shingles, standard architectural shingles, and premium architectural shingles with impact-resistant ratings are three genuinely different products.
Builder-grade shingles are thin. They’re rated for 20-25 years in ideal conditions, which Texas is not. Standard architectural shingles are a meaningful step up in thickness and wind resistance. Premium impact-resistant shingles carry Class 4 ratings and are tested specifically for hail performance.
The material cost difference between standard and premium is real but often smaller than the markup suggests. If a contractor is using cheap materials and charging you a standard price, that’s where margin comes from.
The Underlayment
Underlayment is the layer between the shingles and the roof deck. Budget installs often use 15 or 30 pound felt. Better installs use synthetic underlayment.
Synthetic holds up to heat and UV exposure significantly better than felt. In San Antonio summers, roofing projects sometimes get interrupted. A roof with exposed synthetic underlayment holds up through that exposure. Felt does not.
It’s also a moisture barrier when shingles fail. The underlayment is your second line of defense.
The Leak Barriers
Self-adhering leak barrier membrane should go in the eave areas, around all roof penetrations, in valleys, and along rakes.
This adds material cost and installation time. Skipping it or reducing it is one of the most common ways to cut a roofing bid.
You won’t see it from the ground. You won’t know it was skipped until you get a leak at an eave or valley three years later.
The Ventilation Design
A proper residential ventilation system balances intake at the soffits with exhaust at or near the ridge. The ratio has to be right for the attic volume.
A lot of roofers don’t calculate this. They put in whatever ridge vent comes standard with the shingle package and call it done.
Wrong ventilation traps heat. Trapped heat destroys shingles from underneath. It also voids most manufacturer warranties, though nobody tells you that until you try to file one.
The Installation Detail
Shingle nailing pattern matters. Nail placement that’s too high on the shingle, which is called high-nailing, significantly reduces wind resistance. It’s faster to install. It fails earlier.
Starter strip at the eaves and rakes is designed to seal down the first course of shingles. Using cut field shingles as starter strip, which is common, leaves adhesive gaps at the edge.
Ridge cap shingles, not cut field shingles folded over the peak, should be used at the ridge. Proper ridge cap has a thicker profile and is manufactured with the bend already built in.
What You’re Actually Paying For
Atrium Roofing installs asphalt shingle roofing in San Antonio using premium materials and the full installation sequence, no shortcuts.
They’re an Owens Corning Platinum Preferred Contractor, top 1% nationally, and certified with Malarkey, Atlas, and TAMKO. Each of those certifications has installation standards attached to them.
The difference between a $9k and $15k quote is usually explained somewhere in the list above. The question is whether you find that out now or after the first significant rain.