Is synthetic slate or shake roofing worth it?

Synthetic slate and shake are molded plastic or rubber tiles made to look like stone slate or split cedar. They cost less than the natural materials they copy and far more than asphalt shingles: HomeGuide prices synthetic slate at $9 to $12 per square foot installed and HomeAdvisor at $10 to $15, against $10 to $30 for natural slate and $3 to $8 for asphalt. They are much lighter than slate, and many products carry the top ratings for hail and fire. The sources disagree most about how long they last, so the lifespan is the part to weigh most carefully.

What synthetic roofing is made of

Each manufacturer uses its own blend, which HomeGuide describes as plastic, polymer or rubber, injection molded into the shape of a slate or a shake. Three manufacturers' published descriptions show how much the recipes differ:

• DaVinci says its composite slate is made from virgin resins with UV and thermal stabilizers and a fire retardant.
• Brava says its slate and shake tiles are made from recycled plastics and can be recycled again.
• CeDUR says its synthetic shakes are made with a polyurethane formula.

Because the material differs by brand, so do the weight, the ratings and the warranty. Compare products by their data sheets, not by the word "synthetic".

A note on the words: asphalt shingles are also sold as "composition" shingles, and some cost pages use "composite" for both. Fixr's composite roofing page, for example, lists 3-tab and laminated asphalt shingles among its composition roofs. When an estimate says composite, ask for the manufacturer and the product line.

What it costs against asphalt and the real thing

The sources disagree most on shakes. HomeGuide prices synthetic shake well below real cedar; HomeAdvisor's figures put real cedar as low as $6 per square foot and says composite shake can sometimes cost more than natural cedar. Price your own roof from estimates, and compare them per square, 100 square feet of roof.

For a whole roof, HomeGuide gives $12,500 to $26,000 for synthetic slate. On its table, a 2,000-square-foot roof comes to $18,000 to $24,000. HomeAdvisor puts a natural slate roof at $4,389 to $22,377, averaging $13,348, but that survey average covers roofs of every size and is not a like-for-like comparison.

What else moves the price, according to HomeGuide:

• Brand and product line. Materials alone run $300 to $1,200 per square.
• Fire rating. Class A products cost more than Class C.
• Labor. About half the total.
• The roof itself. Steep pitches, dormers, chimneys and several stories add labor.
• Tear-off, decking and underlayment, as with any roof. Our guide to roof replacement cost covers those.

Weight

Weight is where synthetic products differ most from what they copy.

On these figures, the synthetic slate weighs about a third as much as quarter-inch natural slate (our division). HomeAdvisor says natural slate weighs up to four times as much as asphalt and that most homes need added structural support for it, often $1,000 to $10,000. The National Slate Association says slate at these weights can be too heavy for standard post-war framing, and that a licensed structural engineer should check any house that has never carried a slate roof. HomeGuide says synthetic slate needs no structural reinforcement. For a house that was framed for shingles, that difference in weight is the main practical case for synthetic slate.

Hail, fire and wind ratings

Two tests matter most, and both rate products, not materials.

Impact (UL 2218). Steel balls from 1.25 to 2 inches across are dropped onto the roof covering; Class 4, the 2-inch ball, is the top rating, according to the Insurance Institute for Business and Home Safety. HomeGuide says most synthetic slate brands carry Class 4. DaVinci, Brava and CeDUR each say their products are rated Class 4.

Fire (ASTM E108, also published as UL 790). Class A is effective against severe fire exposure, Class B moderate and Class C light, according to Intertek, a testing laboratory. The test is run on a roof assembly, so the rating depends on what is under the tile:

• DaVinci says all its roofing products are rated Class A.
• CeDUR says its shakes are Class A on their own, which it calls a standalone rating.
• Brava says its slate and shake pass Class A when tested over its fire-retardant underlayment, and Class C over standard underlayment.

Ask whether a Class A rating needs a special underlayment, and make sure that underlayment is in the estimate. Real cedar shakes need fire-retardant treatment to reach Class A, and HomeGuide says codes in many wildfire-prone areas require it.

Wind. HomeGuide says synthetic slate is rated for winds of 110 to 130 mph depending on the brand. DaVinci rates its slate for 110 mph winds; Brava says its tiles are tested to 188 mph with nails and 211 mph with screws. Ask for the rating of the product and the fastening pattern your roofer will use.

Our guide to hail damage explains the UL 2218 classes and what counts as damage.

How long it lasts

The range is wide. InterNACHI's figure is the most cautious; the cost sites' figures are several times higher. A long warranty is not a promise of life: read what it covers, whether it is prorated, and whether it transfers if you sell. Our guide to roofing warranties explains what to look for.

HomeGuide lists curling and cracking in harsh climates as the most common problems with synthetic slate, and HomeAdvisor says composite shingles may fade slightly over time. Real cedar needs more care: HomeGuide says a cedar roof needs a preservative treatment every 3 to 5 years.

When synthetic makes sense

Synthetic slate or shake tends to fit when:

• You want the look of slate or cedar and your framing was built for shingles.
• Hail is common where you live and you want a Class 4 product.
• Your neighborhood rules call for a slate or shake look, or real cedar is limited by fire rules where you live.
• You are prepared to pay well above the price of asphalt shingles.

Natural slate tends to fit when:

• The house already carries slate and its framing was built for it.
• You plan to keep the roof for generations and can find a slate specialist to install and repair it.

Asphalt shingles tend to fit when cost comes first. Impact-resistant asphalt shingles rated Class 4 are also made, as the IBHS tests show; our guide to architectural and 3-tab shingles compares them.

What to ask before you sign

• The manufacturer, the product line and the color, in writing.
• The product's UL 2218 impact class, its fire class, and whether that fire class needs a particular underlayment.
• The wind rating and the fastening the crew will use to meet it.
• The weight per square, and whether anyone has checked the framing if the product is heavier than your current roof.
• The warranty on materials, whether it is prorated or transferable, and the contractor's own warranty on labor.
• How many roofs of this exact product the crew has installed. HomeGuide notes that synthetic slate is nailed differently from asphalt shingles.

Frequently asked questions

Is synthetic slate cheaper than real slate?

Usually, though the ranges overlap. HomeGuide and HomeAdvisor put synthetic slate at $9 to $15 per square foot installed and natural slate at $10 to $30. Natural slate can also need structural reinforcement, which HomeAdvisor prices at $1,000 to $10,000.

Does synthetic slate need a stronger roof?

Usually not. One manufacturer's synthetic slate weighs 311 pounds per square, against about 935 for quarter-inch natural slate, and HomeGuide says synthetic slate needs no structural reinforcement. Check the data sheet for the exact product.

Are synthetic shakes fire-rated?

Many are, but check how. Some products are Class A on their own; others reach Class A only over a fire-retardant underlayment and are Class C without it.

How long does a synthetic roof last?

The sources range from 10 to 35 years (InterNACHI, for simulated slate) to 50 to 100 years (HomeAdvisor). Read the warranty terms closely, and plan around the cautious end of the range.

Can synthetic slate go over my old roof?

Ask your roofer what the product's installation instructions and your local building code allow. Removing the old roof lets the roofer see and repair the deck underneath. Our guide to roof replacement cost covers tear-off.

How we got these numbers

HomeAnvil does not yet publish price data of its own. Every figure on this page comes from a published source, read on September 26, 2026:

• HomeGuide, synthetic slate roofing cost, November 7, 2025: installed cost, totals by roof size, materials per square, cost factors, weight and structure, lifespan, wind and impact ratings, common problems and installation. HomeGuide says its figures come from research and project costs its members report.
• HomeGuide, cedar shake roof cost, November 23, 2025: synthetic and real cedar shake prices, lifespans, maintenance and fire treatment.
• HomeAdvisor, slate roof cost, updated June 19, 2026: natural and synthetic slate and asphalt prices per square foot, totals, structural reinforcement and lifespans.
• HomeAdvisor, composite shingle roof cost, updated June 20, 2026: composite and real cedar shake prices and fading. HomeAdvisor says its figures come from surveying its customers, combined with other published research.
• Fixr, composite roofing installation cost, undated: used only for how it groups asphalt shingles with composition roofs.
• National Slate Association, common myths about slate roofing: natural slate weights and structural review.
• InterNACHI, life expectancy of home components: roofing life expectancies, including simulated slate.
• Insurance Institute for Business and Home Safety, relative impact resistance of asphalt shingles, August 2014: the UL 2218 ball sizes.
• Intertek, ASTM E108 fire tests of roof coverings: the fire classes and assembly testing.
• Manufacturers' published product pages, for their own materials, weights, ratings and warranties: Brava Old World Slate and Cedar Shake; DaVinci slate roofing; CeDUR. Naming them is not a recommendation; they are the products whose data we could read.
• The per-square-foot cedar price from HomeAdvisor and the weight comparisons are our own division, calculated for this page.

We will update this page when these sources publish new figures, and the date above will say when.

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