Slate roofs have an attractive natural appearance and are strong and fire resistant. The material also repels weathering, rotting, insects and other pests. However, slate roofing has several drawbacks and negatives.
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Since slate roofing typically weighs between 363 and 680kg. per 100 square feet, existing supporting structures often need reinforcements to support it. The added support adds to the costs of new home construction.
Although slate stands up well to weather, it is highly susceptible to cracking and breaking if weight is applied to it. This fragility makes roof repairs and maintenance difficult without destroying the slate tiles. Finding matching replacement tiles is challenging because slate tiles are produced and sold in lots and natural colours are rarely duplicated.
Many roofing contractors have minimal experience in slate roof installation since it is a fairly uncommon choice of homeowners. Improperly installed slate roofs are prone to leaks and cracks.
Slate is the most expensive roofing option and normally costs at least five times as much as more common roofing materials.
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