The Heavyweights: Pros and Cons of Clay, Concrete and Slate Roofs
“A roof over your head…”
The very prevalence of this phrase goes right to the heart of what a roof offers: shelter, one of humankind’s primal needs. From simple thatch roofs to elaborate constructions of slate and stone, roofs have historically been crafted by humans in an attempt to gain protection from the effects of weather: rain, snow, wind, hail, dampness, and the sun’s burning rays.
A roof, of course, means more than simple protection from the elements. Along with four solid walls, a roof grants the structural integrity that makes a home a safe haven from other dangers as well: the hazards of fallen tree limbs, the intrusion of stinging or disease-carrying insects, the threat of animal and even human intruders with possible harmful intent. A roof protects everything that lies underneath —not only you, your family and your belongings, but the framework, the walls and the floors themselves.
In addition, there are economic and aesthetic benefits to a well-constructed roof. Not only can a properly-installed roof raise your house’s value, but it can save money by cutting energy bills. Finally, a snug, attractive roof adds immeasurably to the visual appeal of your house.
With the roof performing such important functions, it is imperative to select the proper type of roof for your particular needs. Asphalt shingles, which are fairly inexpensive, are by far the most common material used for roofing; rubber shingles, wooden shingles and various types of metal can also provide good results.
But if you crave a sturdy, durable roof that will last for decades — especially if you feel you have found your lifetime home and are not looking to resell — you may want to make an investment in one of the “heavyweights:” natural slate, clay tiles or concrete tiles.
Clay Tiles: Sturdy Mediterranean Charm
Clay tiles, which reflect rather than absorb the heat of the sun, help to keep homes cool in warm-weather areas. They are also picturesque, weather-resistant and durable, with the potential to last for close to a century. Although clay roofs are strongly associated with the Mediterranean climate and are common in parts of Florida and California, the surprising truth is that they can be adapted for the harshest northern winters by a process of hard-firing. Clay tiles that have been adapted in this way will be rated ASTM Grade 1.
Clay tiles have much to recommend them — they are fire-proof, beautiful, energy-efficient and durable enough to withstand hurricane-force winds. In addition, they are impervious to insect damage, rot, mildew and mold — factors that can torpedo a wooden roof. However, they are a heavy roofing material, and require a sturdy structure to support them. Experts recommend consulting an architect to make sure a clay tile roof doesn’t exceed your house’s load capacity.
Concrete Tile: Durable and Affordable
Concrete tiles are somewhat more inexpensive than clay tiles. Like clay tiles, they are extremely durable, and designed to last for the house’s lifetime. Although they lack the natural beauty of clay tiles, concrete tiles can be customized to mimic the look of clay, wood shake, or slate roofs; they are also available with various pigments for a range of colors. Like clay tiles, concrete tiles are heavy, and require a strong support system.In addition, they are subject to water leakage unless properly sealed, and may need to be periodically power-washed to remove unsightly algae and moss.
Slate: Undeniable Quality
Natural slate— probably the gold standard of roofing materials — features enduring beauty and unparalleled longevity. Resistant to severe rain, wind and snow, impervious to mildew and mold, and non-combustible, slate roofs are usually repair- and maintenance-free, and can be expected to last for generations.
Slate can complement the look of almost any architectural style, and is available in black, gray, green, purple, blue and red; multi-colored and blended color tiles are also available.
The disadvantage of slate is that the cost of purchase and installation can be exorbitant. With a slate roof costing between $1,000 and $4,000 per 100 square feet — nearly five times as much as other roofing materials — it is obviously a major investment. However, a slate rooftop can greatly add to the house’s resale value.
Like clay and concrete tiles, slate is heavy. With a slate roof weighing in at 800 to 1500 lbs. per 100 square feet, you will need an extremely solid roof structure to support its weight. Slate is also surprisingly prone to breakage if walked on by someone unfamiliar with how to properly distribute their weight upon it; for this reason, installation of a slate roof must be performed by professionals experienced with this material. Once a tile is broken, it can be difficult to ensure a consistent match for the repair.
Roofs made of clay tiles, concrete tiles and slate all require a considerable investment, but — as the roof continues to protect and beautify the home over a period of many years — many homeowners come to feel that the expense is truly justified. The durability and strength of tile and slate rooftops can grant an undeniable feeling of stability and security, while their lasting beauty can occasion a sense of joy and pride.
Since your home really is your castle, it can make sense to install a regal-looking “heavyweight” roof as its crowning glory.
About The Author
Robert Landry is co-owner/partner of The Cutting Edge Roofing in Pickering, Ontario, Canada. Robert has more than 25 years’ experience in the commercial and residential roofing industry and has led the company to its current status as an award-winning roofing provider with a Best of 2012 Homestars Award in the Roofing Division. He is avid ice hockey fan and enjoys spending his free time with his family.
