How to Approach Roofing Material Selection
Roofing material selection comes down to three questions that pull against each other: how long the material lasts, how it performs in your climate, and what it costs to buy and to keep. A material that wins on one can lose badly on another. Slate outlives everything and needs framing most houses do not have. Asphalt costs the least and asks the most of your maintenance schedule.
Your region does a lot of the deciding. Hail country, wildfire country, salt air and freeze-thaw cycles each rule certain choices in or out. So does the structure you already have. Below is what each of the common options is genuinely good at.
Asphalt Shingles
Asphalt is the default for a reason. It is the least expensive common roof covering, it installs quickly, and with correct installation and maintenance it commonly runs 15 to 30 years depending on the product grade and the climate.
The material flexes with daily temperature swings, which reduces cracking and splitting during installation. Most architectural shingles carry a Class A fire rating when installed as a full system over an approved deck. Color and profile options are wide. The trade-off is service life. Asphalt ages faster than any other option here, and it shows that age through curling, granule loss and lost adhesion. Budget for a mid-life inspection rather than assuming the manufacturer’s stated term.
Wood Shakes
Wood shakes look like nothing else, insulate well, and dampen outside noise. They are light enough to go on most existing framing without reinforcement. With regular maintenance they can reach 30 years.
The costs are real and ongoing. Shakes need cleaning and sealing to hold up against weather, and they need fire-retardant treatment, which has to be maintained rather than applied once. Rot and insect damage are live risks in humid regions. Several jurisdictions in wildfire-exposed areas restrict or prohibit untreated wood roofing outright, so check local code before you fall in love with the look.
Metal
Metal roofing runs 50 years or more, sheds water and snow efficiently, and holds up under wind because standing-seam panels lock together and present very few seams for wind to get under. It reflects solar heat, which shows up on summer cooling bills. It is light, so it rarely requires structural reinforcement, and it can often go over an existing deck.
The barrier is the up-front number, which is well above asphalt. Over a full service life the arithmetic usually reverses, since you are buying one roof instead of two or three, with less maintenance in between. Metal also dents under large hail, so ask about gauge and profile if you live where hail is routine.
Slate
Natural slate is the long-life option. Properly installed slate roofs can run up to 100 years, resist fire, and shrug off severe weather. The material comes in a range of colors and textures and needs little upkeep.
Three things keep slate rare. It is the most expensive material on this list. It is heavy, and most homes need structural work before it can go on. And repairs are specialized, because tiles are frequently cut to fit and the trade that knows how to walk a slate roof without breaking it is small. If you are considering slate, get the framing evaluated before you get a roofing quote.
Rooftop Decks and Deck Tiles
Rooftop decks are increasingly common in dense urban housing, and they change the question entirely. A deck surface built over occupied space is an exterior elevated element, and it carries a waterproofing assembly, drainage and structural framing underneath the part you can see.
Deck tiles in composite or metal handle weather well and improve drainage across the surface. What fails is rarely the tile. It is the membrane, the flashing and the framing below, and none of that is visible once the deck is finished. In California, exterior elevated elements on multifamily and condominium buildings are subject to SB 721 and SB 326 inspection requirements. NRCIA accredits members through the E3GUARD™ program specifically to evaluate decks, balconies, walkways, patios and staircases.
Start With the Roof You Have
Before choosing a replacement material, find out what condition the current roof and its deck are actually in. That answer changes the budget more than the material choice does. Across 6,460 member inspections nationwide, more than 66 percent of roofs either qualified for a LeakFREE® Roof Certification or could be repaired to qualify, which means a replacement decision is often less urgent than it looks from the driveway.
NRCIA sets the inspection standard, trains and accredits members, and maintains the member directory. Members perform the inspections and issue the reports.
Find an accredited NRCIA inspector near you and get the roof assessed before you choose materials: /member-directory/
LeakFREE®, Forensic ROOF®, Mr. RoofCheck®, InspectionPLUS®, Today’s Inspection… Tomorrow’s Protection®, and Got Leaks?® are registered trademarks of Field Gate FLP, used by permission. RoofGUARD™, ForensicGUARD™, DisasterGUARD™, E3GUARD™, and Think Like a Raindrop™ are trademarks of Field Gate FLP.
