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Roof replacement can be an expensive arduous task and most of us don't even think about the top of the house until it springs a leak. By then damage extends beyond the roof, potentially warping the 4"x8" sheathing panels and weakening the joists which hold them in place. The other bad aspect of a leaking roof is saturation of the wall board, setting up a potential for mold. Most common asphalt tile is generally warranted for 15 to 40 years and may actually hold up for an additional 5 years. When a roof is replaced, its usually best to do a tear-off as well - stripping down the surface to its bare panels. Putting on layer-upon-layer of roofing tiles is a losing proposition. Load-bearing is a critical factor in a decision to cover over old asphalt (not recommended) with new asphalt tiles. Too much weight can cause the sheathing to buckle and cause other structural problems. If you are building a new home, its advisable to use roofing material rated from 50 to 100 years. By using lower rated materials, one risks the expense of having to replace the roofing materials in thirty years or so - much more expensive than doing it right the first time.
...now onto the ratings...
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Asphalt |
Cedar |
Slate |
Clay Tile |
Steel |
| Material Cost |
$25 - $65 |
$100 - $230 |
$300 - $855 |
$300 - $720 |
$80 - $340 |
| Installation Cost |
$30 - $70 |
$70 - $130 |
$120 - $160 |
$120 - $180 |
$85 - $105 |
| Weight |
195 - 430 lbs. |
300 - 400 lbs. |
900 lbs. |
900 lbs. |
50 - 270 lbs. |
| Life Span |
15 to 40 years |
20 - 50 years |
50 years |
50 - 100 years |
20 - 50 years |
Costs and weights are "per square", coverage of 100 square feet. Underlayment is not included in cost evaluations. Contractors markup is generally 40% to the material costs.
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