At Proway Works, we always convey one simple message to homeowners. It is the importance of maintaining a slate roof. If done right, it extends the longevity and prevents costly repairs of your slate roofing system.
In the roofing world, slate is known as one of the most durable and aesthetic materials. The variants of slate roofs are intense; they include Vermont, synthetic, natural, Welsh, and most notably, the Spanish slate.
In North Carolina, many roofs with slate have lasted more than 100 years!
However, without regular maintenance, such longevity and durability are not possible to achieve. This region’s humid climate and occasional storms can result in structural damage and leakage.
A study from Roofing Contractor found out nearly 80% of premature roof failures are due to lack of proper maintenance. Similarly, a report from Bloom Roofing states a proactively maintained roof has an average lifespan of 21 years.
In this guide, we will help homeowners like you with maintenance tips to protect your roof. Also, maximize the investment you have in your roofing system.
Slate Roof’s Maintenance Importance
Durability and Lifespan
A slate roofing system can last for 75 to 100 years. The longevity will depend on proper installation and maintenance. Unlike other materials like asphalt, slate tiles do not require any specialized approach to upkeep.
As a homeowner, you must conduct at least one roofing inspection by a professional roofer. If done right, it can reduce the likelihood of any major repairs occurring. These repairs tend to have a cost of upwards of $10,000 to $20,000 or even more (HomeAdvisor).
Impact of Durham’s Climate
In Durham, we experience an annual rainfall of 48.1 inches (US Climate Data). If slate tiles aren’t installed as required, severe water damage or leakage is around the corner.
Source: US Climate Data
On top of that, occasional storms can have a negative impact on a slate roof. The moisture and retention cause freeze-thaw damage. It can lead to cracking and delamination of slates.
Also, in Durham, we do experience strong winds of about 58 mph or even higher, which can loosen improperly secured tiles. In the worst case, the many tiles can go absolutely missing due to wind.
However, a proper maintenance schedule helps to identify these issues earlier. It minimizes the risk of incurring any damage and protects the home from any water infiltration.
Slate Roof Maintenance Tips
Regular Inspections
- As stated earlier, conduct visual roof inspections at least once a year. Especially after any severe weather event, check for cracked, missing, or slipping slate tiles.
- When it comes to inspection, hire a professional contractor. It is not recommended for a homeowner to walk on a slate roof. It can break the tiles or crack them.
- It is important to examine flashing around chimneys, skylights, and valleys. A deteriorated metal can result in leakage in the slate roofs.
- Check the ridge and hip tiles. Any movement in these areas can cause displacement of slate tiles.
Cleaning and Debris Removal
- It is crucial to remove debris like leaves and twigs every 3-6 months. It can prevent moisture retention or any organic matter decay, which can damage slate. If not a roofer, you can hire a roof cleaner to get the job done.
- Use a soft brush or lower-pressure water to clean algae, moss, or mildew. It is a common scenario in a city like Durham with a humid climate.
- It is highly recommended to never use power washing on a slate. The high pressure can loosen tiles. Also, degrade the stone surface.
- It is vital to keep roof valleys and flashing areas clear of debris. If these areas are clogged, it can lead to trapped moisture. As a result, it negatively impacts the health of the slate roofing system.
Gutter and Drainage Maintenance
- As a homeowner, be aware of the conditions of your gutters and downspouts. At Proway Works, we recommend cleaning it at least once a year. If not, the backed-up water can infiltrate the underlayment of the tiles.
- A roofing system is incomplete without gutter guards. As a homeowner, you must ensure your chosen contractor installs copper or zinc and copper gutter guards. It will prevent any excessive debris buildup without causing any corrosion.
- Also, check for any sign of water overflow or improper drainage. It can weaken the edge and stability of the slate tiles.
Addressing Small Repairs Early
- A contractor can use roofing hooks to replace individual slates. It is a better alternative than nailing through existing tiles.
- The minor cracks can be sealed with specialized slate repair adhesives. In terms of slate, a generic roofing sealant is not the best option.
- If multiple slate tiles are slipping, the roofer must check underlying battens or lath. There is a possibility of a deterioration in the support structure. If not fixed on time, it can lead to an all-around displacement of the tiles.
Moss and Algae Growth
- If tree branches are overhanging, it is best to trim them. A slate roof covered with organic growth can be susceptible to weathering.
- A roofer must apply zinc or copper strips along the ridge. It creates a natural biocide that prevents any moss and algae growth.
- Avoid using bleach or acid-based cleaners. These can degrade the natural appearance of the slate over time.
Freeze-Thaw Damage in Winter
- A roofing system must have proper attic insulation and ventilation. It helps to reduce any ice formation on the slate tiles. Also, it plays a key role in summer days to regulate indoor temperature.
- If the roof is filled with snow, remove it with a roof rake. It is recommended to not use shovels or tools that can crack slate.
- Avoid the use of salt or chemical deicers. These can corrode the metal flashing and weaken slate tiles.
Hire a Professional Contractor in Durham
At Proway Works, we are certified and experienced with slate roofing systems. We have been installing and replacing slate roofs in Durham and North Carolina for the past three decades. On top of that, we provide maintenance and repair service to keep your roof in top condition.
When it comes to anything with a roof, better leave it to a professional. As a homeowner, if you carry out any improper measure, it will cause more damage than good. Here are some criteria you must consider before selecting a contractor for your slate roof:
- Check for all the necessary valid licensing and insurance related to roofing.
- The contractor must have at least three years of installing slate roofs.
- If there’s any issue with your slate roof, ask the roofer to use appropriate fasteners. For example, copper or stainless steel. It can prevent long-term damage to your roof.
- In our opinion, speak to at least three roofers before scheduling any maintenance or repair work. Or, you can consult with your previous contractor who installed slates earlier on your home. It is crucial to understand the condition of your roofing system.
Frequently Asked Questions
How Much Does It Cost to Maintain a Slate Roof in Durham, NC?
The cost can vary based on the condition of the roof. In general, routine maintenance costs about $300 to $1000 per year. In case of any major repair, it can be between $1,500 and $5,000 or above.
Can I Walk on My Slate Roof for Inspection?
As stated earlier, as a homeowner, it is not recommended to walk on a slate roof. A slate tile can crack under 250 pounds of pressure. Therefore, it is best to inspect using binoculars or hire a professional roofing contractor.
What Are the Best Products to Clean a Slate Roof?
It is recommended to use specialized slate roof cleaner. Or, mild solutions with water and hydrogen peroxide. However, you must avoid using any harsh chemicals that erode the health of your slate tiles.
How Do I Know When My Slate Needs Replacement?
If a few slate tiles are missing or cracked, a repair job can be the solution.
However, if more than 20% of the tiles are damaged, a replacement is the best option. If the slate tiles are exposed in these conditions for a prolonged period, it can lead to structural damage. The cost estimated to fix these damages can be around $10,000 or above.