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Residential Roof Consultant ~ Unbiased Advice ~ Independent Oversight
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Slate / Tile
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The Process
ROOFING PRODUCTS
Pitched Roofs
► Cedar
► Composition
► Metal
► Slate / Tile
► Synthetic
Low-Pitch / Flat Roofs
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Concrete and clay roof systems have long been popular in the Southwest. They provide a durable roof system in a dry climate, but there are some inherent challenges in a high-moisture climate like the Pacific Northwest. These products are available in numerous tile and slate styles, both in full-weight and light-weight options. The full-weight products often require specific structural engineering to support the roof product weight. In the light-weight variety, the roofs can be installed over conventional framing.
Because these products are made from natural materials like concrete and clay, they are porous by nature and prone to moss growth. As they age, they typically become brittle and susceptible to cracking when walked upon. True or natural slate is easily the most durable roofing product in terms of walkability, but has severe limitations with regard to weight and affordability. Tile is typically installed over battens, and most water infiltration issues are related to blocked sub-roof flashing elements and cracked or broken tiles. Superior substrate preparation is recommended and should incorporate an ice and water shield, treated battens and painted/galvanized screws as fasteners for the batten system.
|
Product |
Exposure |
Batten System |
Walkability |
Structural Required |
Life Expectancy |
|
Concrete Slate |
10” - 14” |
Yes |
Yes |
Yes |
50+ |
|
Light-weight Slate |
10” - 14” |
Yes |
No |
No |
50+ |
|
True Slate |
6” - 10” |
No |
Yes |
Yes |
Permanent |
|
Clay Tile |
14” |
Yes |
No |
Yes |
50+ |
|
Concrete Tile |
14” |
Yes |
Yes |
Yes |
50+ |
|
Light-weight Tile |
14” |
Yes |
No |
No |
50+ |
Pros
- Durability
- Multiple styles available
- High perception of value
- Long life expectancy
Below are links to several manufacturers’ sites. Remember that manufacturers’ web sites are designed to promote their products and will generally provide you with only positive product information.
You can count on Seattle Roof Advisor to provide unbiased advice.
Cons
- Price
- Moss growth
- Limited walkability
- Susceptible to cracking
- Excessive weight
- Maintenance challenges
- Water permeability in side-lap products
Even though there are clear limitations with regard to structural issues, with proper substrate preparation, a slate or tile roof system can be an excellent choice for a long-lasting roof system.
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