Interview Questions for Slate Roof Inspection

Slate roofing comes in various types, each with unique characteristics influencing its durability and appearance. The most common include:

• Natural Slate: This is the most durable and sought-after type, quarried from natural formations. Different regions yield slates with varying colors and textures – think the deep grays of Vermont slate or the rich greens of Welsh slate. The quality varies significantly depending on the quarry and splitting process.
• Synthetic Slate: A more budget-friendly alternative, synthetic slate mimics the look of natural slate but is made from composite materials like polymers and fiberglass. While less durable than natural slate, it offers a lower maintenance option and is often lighter.
• Recovered Slate: This sustainable choice uses reclaimed slate from older roofs. It offers a unique, aged aesthetic but may have more imperfections and require careful assessment for potential damage.

Choosing the right type depends on budget, aesthetic preference, and the expected lifespan of the roof. Natural slate, though expensive initially, offers unparalleled longevity, while synthetic offers a more cost-effective but shorter-term solution.

Assessing a slate roof’s condition requires a multi-faceted approach, combining visual inspection with hands-on examination. Methods include:

• Visual Inspection from Ground Level: Observe the overall roofline for missing or damaged slates, significant discoloration, or sagging sections. Binoculars can be helpful for detailed viewing.
• Close-Up Inspection from the Roof (with proper safety precautions): This allows for a thorough examination of individual slates, assessing for cracks, chips, weathering, and signs of freeze-thaw damage (more on this later). A strong head lamp is beneficial for checking in shaded areas.
• Checking the Underlayment: Where possible, access the underlayment to check for moisture penetration. This involves carefully removing a few slates, ensuring you replace them properly.
• Assessing Flashings and Chimneys: These areas are prone to leakage; careful attention needs to be paid to the condition of the metalwork and sealing materials (detailed in a later response).
• Documentation: Photos and detailed notes are crucial. They serve as records of the roof’s condition for future reference and insurance claims. Consider using a drone for an aerial survey of large roofs.

A combination of these methods provides a comprehensive picture of the roof’s health and helps identify areas needing immediate attention or future preventative maintenance.

Weathering and degradation in slate tiles manifest in several ways:

• Surface Erosion: The slate’s surface might appear worn, with a loss of its original texture. This is often caused by wind, rain, and sun exposure over time.
• Cracking and Fracturing: Stress from freeze-thaw cycles, structural movement, or impacts can lead to cracks running through the slate. These can be subtle hairline fractures or larger, more obvious breaks.
• Delamination: The layering of the slate can separate, causing portions of the slate to flake or peel off.
• Efflorescence: White, powdery deposits (salt deposits) on the slate surface indicate the presence of moisture, often due to poor flashing or underlying structural issues.
• Discoloration: Changes in color, often darkening or staining, may indicate exposure to moisture or pollutants.
• Moss and Algae Growth: While not damage in itself, this indicates areas of prolonged moisture retention. It can lead to more significant issues if left untreated.

The severity of these signs varies based on the age, type, and exposure of the slate. Early detection is key to preventing more extensive damage and costly repairs.

Freeze-thaw damage is a significant concern for slate roofs. Water seeps into cracks in the slate, freezes, expands, and puts pressure on the already weakened material. Repeated cycles cause the slate to spall (chip) or crack further. Identifying this involves looking for:

• Spalling: Small, chipped pieces of slate breaking off along the edges or surface.
• Increased Cracking: Existing cracks widening or new cracks appearing, particularly in areas exposed to repeated freezing and thawing.
• Scaling: Layers of slate peeling or separating from the main body.
• Areas of significant moisture retention: These could indicate poor drainage or areas where water is trapped within the slate itself.

Assessment requires careful examination of the affected areas, noting the extent and pattern of the damage. Severe freeze-thaw damage often requires slate replacement. Early detection allows for targeted repairs preventing escalating issues.

Underlying structural problems can significantly impact a slate roof’s condition. Indicators include:

• Sagging Roof Sections: Noticeable dips or unevenness in the roofline suggest issues with the supporting structure, such as weakened rafters or trusses.
• Cracks in Walls or Chimney: These could indicate foundation settlement or other structural instability that transmits stress to the roof.
• Uneven Slate Layering: If the slate appears to be buckling or unevenly laid, it suggests underlying problems with the roof’s decking or sheathing.
• Excessive Gutter Sagging: While not directly related to the slate itself, overloaded gutters can add undue stress and even contribute to roof damage.
• Water Leakage unrelated to Slate: Leaks appearing unexpectedly in interior walls might mean water penetration through the underlying structure, not just the slate itself.

Discovering these signs requires a thorough inspection of the entire structure, not just the roof. Addressing these issues promptly is crucial to prevent catastrophic damage.

Inspecting flashings and chimneys is critical, as these areas are particularly vulnerable to leaks. The inspection should cover:

• Flashing Condition: Examine all flashing materials (metal, lead, etc.) for corrosion, gaps, and proper sealing. Look for signs of rust, deterioration, or lifting away from the substrate.
• Chimney Flashing: Pay close attention to the flashing around the chimney, checking for gaps or deteriorated mortar joints. This area experiences significant temperature fluctuations, so careful examination is needed.
• Counterflashing: Check for proper installation and condition of the counterflashing, which covers the chimney from above. Ensure that it’s properly sealed and not damaged.
Caulking and Sealants: Inspect the caulking and sealants around flashing and chimneys. Look for cracks, gaps, or signs of hardening or deterioration. Regular maintenance and re-application of sealant is necessary.

Any damage to flashings or chimneys needs immediate attention to prevent water penetration, which can lead to extensive and costly repairs.

Proper ventilation is essential for a healthy slate roof. It prevents moisture buildup, which can contribute to the growth of mold, mildew, and algae, accelerating the degradation of the slate and underlayment. Inadequate ventilation can lead to:

• Ice Dam Formation: Warmer air from the interior of the house can melt snow on the roof, then refreeze at the eaves, creating ice dams that can damage the roof and gutters.
• Moisture Accumulation in the Attic: Dampness and condensation in the attic can cause structural damage and create an environment ripe for mold growth.
• Faster Slate Degradation: Constant moisture exposure weakens the slate, making it more susceptible to cracking and spalling.
• Reduced Roof Lifespan: The combination of moisture damage and stress on the structure shortens the lifespan of the entire roofing system.

Adequate ventilation involves proper soffit and ridge vents ensuring air circulation throughout the attic space. A thorough inspection should check the size, location and functionality of these vents.

Slate roof underlayment, while crucial for waterproofing, can suffer from several issues. The most common problems arise from improper installation, material degradation, and age. Think of the underlayment as a safety net; if it fails, the roof’s integrity is compromised.

• Punctures and Tears: These can occur during installation, from foot traffic during the roofing process, or from falling debris. Even small tears can lead to leaks if not addressed.
• Improper Overlap: Insufficient overlap between sheets leaves gaps that allow water penetration. This is a frequent oversight, particularly in older installations.
• Material Degradation: Underlayment materials, like felt or synthetic membranes, break down over time due to UV exposure, moisture, and temperature fluctuations. This weakens the material and reduces its effectiveness.
• Moisture Accumulation: Poor ventilation can trap moisture under the slate, leading to underlayment rot and mold growth. This significantly impacts its lifespan and waterproofing capabilities.

Inspecting the underlayment requires carefully examining exposed areas, especially around flashing and valleys. During a reroofing project, I always thoroughly check the underlayment before installing new slate.

The decision between repairing and replacing a damaged slate roof depends on several factors: the extent of damage, the age of the roof, the slate’s condition, and the overall cost-benefit analysis. Imagine evaluating a piece of fine china – a small chip might be repairable, but a major crack warrants replacement.

• Extent of Damage: Is it a few broken slates, or is there widespread damage due to age, storms, or neglect? A small area of damage is easier and cheaper to fix; widespread issues indicate replacement may be more cost-effective in the long run.
• Age of the Roof: An older roof might have reached the end of its lifespan, making replacement a more prudent strategy. Regular maintenance extends the roof’s life, but even the most resilient slate eventually needs replacing.
• Slate Condition: Are only the slates damaged, or is the underlying structure – including the underlayment, sheathing, and rafters – also compromised? Extensive structural damage often necessitates a complete replacement.
• Cost-Benefit Analysis: Repairing a large number of broken slates can be just as expensive as a partial replacement. A detailed assessment considers repair costs, material cost, labor, and the longevity of each option before a decision is made.

I often create a detailed report that includes photographs, a damage assessment, and cost estimations for both repair and replacement options, helping clients make an informed decision.

My experience encompasses a range of slate repair techniques, from simple replacements to more complex repairs involving custom fabrication. I’ve worked with various slate types and conditions, always aiming for a seamless, aesthetically pleasing, and durable repair.

• Individual Slate Replacement: This involves carefully removing damaged slates, matching them with salvaged or new slates as closely as possible in terms of color, size, and texture, and securely refastening them using appropriate techniques (wire, copper nails, or slate clips).
• Section Repair: Larger areas of damage sometimes require a section repair involving the removal and replacement of multiple slates, often using a similar matching and refastening process.
• Mortar Repair: When slate is loose or cracked due to compromised mortar, I repair the mortar joints, ensuring proper adhesion and water resistance.
• Custom Slate Fabrication: For particularly unique or difficult repairs, I might need to create custom slate pieces to fit irregular gaps or damaged areas, replicating the original slate’s profile as closely as possible.

Safety is paramount. I always use appropriate safety equipment like harnesses, fall arrest systems, and protective gear when working at heights on slate roofs. Every repair is carefully planned and executed to achieve longevity and integrity.

Safety is my top priority when inspecting a slate roof. These roofs are inherently hazardous due to their steep pitches, slippery surfaces, and the potential for falling debris. Ignoring safety precautions can result in serious injury.

• Fall Protection: This is crucial. I always use a safety harness and anchor points, especially on steeper roofs. A sturdy ladder and proper ladder safety techniques are always implemented.
• Footwear: I wear appropriate footwear with good traction to prevent slips and falls on the often-wet or moss-covered slate.
• Personal Protective Equipment (PPE): Safety glasses protect against falling debris, while gloves prevent cuts and scrapes from sharp slate edges. A hard hat further protects against head injuries.
• Weather Conditions: Inspections are postponed if weather conditions (high winds, rain, ice, or snow) are hazardous.
• Awareness of Surroundings: I am always mindful of potential hazards like broken slates, loose materials, and nearby power lines.

My safety practices are unwavering. I’d rather reschedule an inspection than risk injury.

Thorough documentation is essential. I use a combination of visual and written records to capture all aspects of the inspection. Think of it like a detailed medical chart for the roof.

• High-Resolution Photography: Detailed photographs of damage, including close-ups and wide shots, are crucial for showing the extent of issues.
• Sketching or Drawings: Sketches help highlight the location of damage or other significant findings, especially useful for complex roof layouts.
• Detailed Written Report: This report summarizes the inspection findings, identifies problems, and makes recommendations. It often includes the estimated cost of repairs or replacement.
• Digital Measurement Tools: I use laser measures for accurate measurements of the roof’s dimensions and damaged areas.
• Drone Imagery (if applicable): For large or complex roofs, drone technology can provide a comprehensive overview and detailed images inaccessible by traditional methods.

My reports are clear, concise, and easy to understand, enabling clients to make informed decisions about their slate roof maintenance or repair.

I’m familiar with various slate installation methods, each with its advantages and disadvantages depending on the specific slate type, roof design, and local building codes. Just like there are many ways to build a house, there are multiple ways to install a slate roof.

• Secret Nailing: Slates are nailed in a way that hides the fasteners, maintaining an aesthetically pleasing appearance. This method requires more skill and precision.
• Surface Nailing: Fasteners are visible, which is a simpler but less aesthetically pleasing method.
Through-fastening: Slates are fastened through holes drilled directly into the slate, and are then attached to battens or directly to the roof decking.
• Hooked Slates: Some slate types are pre-fabricated with hooks that engage directly to the roof underlayment, simplifying and speeding up the installation process.
• Pattern and Gauge: Understanding the correct slate pattern (e.g., 3:1 or 4:1) and gauge is crucial. This ensures proper overlap, water resistance and structural integrity.

My experience allows me to assess the existing installation method and recommend appropriate techniques for repair or replacement, ensuring the project aligns with best practices and building codes.

Natural and synthetic slate offer distinct advantages and disadvantages. The choice depends on budget, aesthetics, and longevity expectations. Think of it like choosing between a vintage car and a modern replica.

• Natural Slate: Provides a timeless aesthetic, exceptional durability, and longevity. However, it’s more expensive, heavier, and can be more prone to breakage during handling and installation.
• Synthetic Slate: Offers a cost-effective alternative with similar aesthetic appeal. It’s lighter and easier to handle, making installation quicker and less labor-intensive. However, it typically has a shorter lifespan than natural slate and may not have the same inherent weathering characteristics, especially colour consistency over time.

Both materials can create a beautiful roof. However, a comprehensive understanding of each material’s properties, combined with budget limitations and the customer’s design preference, is crucial in making the right selection.

Estimating the cost of slate roof repairs or replacement involves a multifaceted approach. It’s not a simple calculation, as several factors significantly influence the final price. Firstly, we need to determine the extent of the damage. Is it a minor repair involving a few cracked slates, or a major overhaul needing extensive work? Secondly, the type of slate itself matters. Natural slate, for instance, is more expensive than synthetic options. Its quality and thickness also play a role. Third, labor costs vary significantly based on location and the contractor’s experience. Access to the roof (e.g., steepness, height) will also affect labor costs.

The process usually begins with a thorough inspection. I document all damaged areas, take detailed measurements, and carefully assess the condition of the underlying structure. Once the scope of work is defined, I use established pricing models – either per square foot or a detailed breakdown of individual tasks (e.g., slate replacement, underlayment repair, flashing repair). For example, replacing a single slate might cost between $10 and $50 depending on accessibility and slate type. A complete roof replacement can easily range from tens of thousands to over a hundred thousand dollars for larger homes. I always provide clients with a detailed breakdown, clarifying each cost component and giving them options.

I find it beneficial to compare quotes from multiple suppliers for materials. This ensures the client gets the best value for their money. Finally, I incorporate contingency costs to account for unforeseen issues during the repair process, keeping transparency and realistic budgeting at the core of my service.

While drones and other advanced technologies offer exciting possibilities in roof inspections, limitations exist, particularly with slate roofs. Drones, for example, can provide excellent aerial views, helping assess overall roof condition and identifying large-scale problems. However, their high-resolution cameras often struggle to detect subtle cracks or damage to individual slates, which is crucial for proper slate roof assessment. The resolution might not be sufficient to distinguish between minor imperfections and significant damage requiring immediate attention.

Moreover, weather conditions can severely impact drone usage. Wind, rain, or snow can make safe drone operation impossible. Similarly, the complexities of slate roof structure, such as intricate valleys and complicated flashing details, can obstruct clear drone imagery. Finally, drones don’t replace the need for hands-on inspection. I need to physically touch and assess the slates to determine their integrity, measure their thickness, and check for underlying issues. Using a drone in tandem with a thorough physical inspection provides the best overall assessment.

Handling difficult clients or contractors requires patience, clear communication, and a professional demeanor. My approach prioritizes active listening and understanding their concerns. If a client is upset, I listen to their complaints without interruption, showing empathy and validating their feelings. Then, I clearly explain my findings, using straightforward language, avoiding technical jargon. I provide visual aids such as photos or diagrams to support my assessment. If a contractor seems to be disagreeing, I calmly present my evidence and methodology. I always maintain professionalism, even under pressure, and offer solutions, not just problems.

For example, I’ve encountered situations where a client questioned the necessity of a repair. By showing them close-up pictures of damaged slates and explaining the potential consequences of inaction (e.g., leaks, further damage), I’ve successfully addressed their concerns. With contractors, it’s about professional collaboration. If there’s a disagreement on a specific technique, I’d present industry best practices and supporting documentation. Ultimately, my goal is to find common ground, ensuring the client’s best interests are met while maintaining respectful communication with all parties.

Creating detailed inspection reports is a cornerstone of my work. My reports are meticulously crafted and include a comprehensive overview of the roof’s condition, focusing on specific findings. I utilize clear and concise language, avoiding technical terms where possible, ensuring the report is understandable for both clients and contractors. Each report includes several key components: photographic evidence documenting all damaged areas, a detailed description of the damage, including location and severity; an assessment of the roof’s overall condition, highlighting any potential safety concerns; recommendations for repair or replacement, clearly outlining the scope of work; and a cost estimate with itemized details. I utilize software that allows for easy integration of photos and annotations directly onto the report.

For example, a report might include a section on ‘Flashing Condition,’ detailing any observed problems with the flashing around chimneys or valleys. This section would contain photographic evidence, a description of the damage (e.g., ‘Corrosion observed on north-facing chimney flashing,’), and a recommendation for repair or replacement (‘Recommend replacing corroded flashing with new copper flashing’). The use of standardized reporting formats ensures consistency and facilitates efficient communication with other professionals involved in the project.

Identifying a significant safety hazard during a slate roof inspection requires immediate and decisive action. My primary concern is the safety of the property owners and myself. If I find a situation that poses an imminent danger, such as a large section of the roof at risk of collapse or loose slates posing a fall hazard, I will immediately inform the homeowner of the danger and advise them to vacate the affected area. I will then take steps to mitigate the hazard to the best of my ability, without jeopardizing my own safety, such as temporarily securing loose slates or blocking off access to the dangerous area. Following this, I’ll document the hazard thoroughly, including photos and detailed descriptions in my report. I will provide clear and explicit safety recommendations, and advise on obtaining professional assistance for immediate remediation.

For instance, if I observe significant structural damage that could cause a roof collapse, I wouldn’t simply note it in my report. I would immediately alert the homeowner to the urgent need for professional structural assessment and potentially temporary relocation. Safety is paramount, and prioritizing it dictates my immediate actions in such a scenario.

Determining the cause of a slate roof leak involves a systematic and thorough investigation. I start by visually inspecting the roof, looking for signs of damaged or missing slates, cracked flashing, or deteriorated mortar. This often involves using binoculars to examine hard-to-reach areas. I also carefully check the areas surrounding the leak, such as chimneys, valleys, and skylights, paying close attention to any signs of water penetration. This initial visual assessment provides crucial clues about the leak’s origin. I then proceed to a more detailed investigation which may include using a moisture meter to detect hidden moisture within the roof structure and checking the attic for signs of water damage. If necessary, I may use a waterproof probe to find the exact point of water entry. I’ll consider external factors such as wind direction and rainfall patterns during the inspection.

Once the point of entry has been identified, I carefully consider the likely cause. Is it a cracked slate, inadequate flashing, or perhaps a problem with the underlayment? I document all findings and observations, correlating them with the leak’s location. For example, a leak near a chimney might be caused by damaged flashing, while a leak in the middle of a roof section could indicate a broken or missing slate. A comprehensive report provides a clear picture of the situation and recommendations for effective repair.

Premature slate roof failure can stem from a variety of factors. Improper installation is a major culprit. Incorrectly installed slates, inadequate underlayment, or poorly constructed flashing can leave the roof vulnerable to water damage and lead to premature deterioration. Poor quality materials can also contribute; using low-quality slate, underlayment, or fasteners can result in a shorter lifespan. Neglecting regular maintenance is another critical factor. Accumulated debris, moss growth, and lack of inspection can damage the roof gradually. Environmental conditions like extreme weather events (hailstorms, strong winds, freeze-thaw cycles) can also accelerate slate roof deterioration. Lastly, improper ventilation can lead to moisture buildup and accelerate the decay process. This can lead to increased risk of fungal growth and premature decay of the slate and underlayment.

For example, using improperly sized nails or neglecting to provide sufficient overlap between slates during installation will create weak points that expose the roof to water infiltration. Similarly, the lack of proper attic ventilation can cause condensation to form beneath the slate, accelerating the decay process. Understanding these factors is essential in providing effective recommendations for preventing premature slate roof failure and extending its lifespan.

Assessing the integrity of a slate roof’s underlying structure – the battens and rafters – is crucial for a complete inspection. It’s like checking the foundation of a house before assessing the walls; a weak foundation can lead to significant problems later. I begin by visually inspecting all accessible areas of the battens and rafters. This includes looking for signs of rot, decay, insect infestation (termite damage is common), or significant warping or cracking. I’ll use a probing tool to check the firmness and soundness of the wood in less accessible areas.

For a more thorough assessment, I’ll often use a moisture meter to detect hidden moisture problems within the wooden structure. Elevated moisture readings can indicate rot even before visual signs become apparent. If I suspect significant structural damage, I might recommend a more invasive inspection, possibly involving removing some slates to get a closer look. This isn’t always necessary, but sometimes it’s the only way to accurately assess the extent of the damage. The inspection report will detail the findings and recommend appropriate actions, from minor repairs to major structural remediation.

• Visual Inspection: Checking for cracks, warping, rot, and insect damage.
• Probing: Using a tool to assess the firmness of wood in less accessible areas.
• Moisture Meter: Detecting hidden moisture problems indicative of rot.

My familiarity with building codes and regulations regarding slate roofing is extensive. I understand that these codes vary by location, and I always ensure my inspections are compliant with the relevant local, state, and national regulations. This includes understanding requirements for proper underlayment, flashing, and ventilation. I’m well-versed in the International Building Code (IBC) sections relevant to roofing, as well as specific local amendments and ordinances. For example, some jurisdictions have strict requirements regarding the spacing of battens or the type of fasteners used. Ignoring these could lead to costly legal issues or insurance problems for the homeowner. I consider code compliance an essential aspect of a thorough and responsible slate roof inspection.

Understanding these codes allows me to identify potential safety hazards and code violations. I can then clearly articulate these issues in my report, providing recommendations for bringing the roof into compliance. This often involves consulting the appropriate documentation and referencing specific code sections in my report.

For managing and analyzing inspection data, I utilize a combination of tools. I start with a detailed checklist to ensure consistency and thoroughness during the inspection. This is supplemented by photographic documentation, using a high-resolution camera to capture clear images of all relevant areas, including both damage and healthy sections of the roof. I use specialized roofing software to create detailed reports, which can include images, measurements, and detailed observations. This allows me to generate professional-looking reports that clearly communicate my findings and recommendations to clients. I also use cloud-based storage to securely archive the data, ensuring its accessibility and longevity.

In some instances, I may use drone technology to capture aerial images of the entire roof, providing a comprehensive view of its condition. This is particularly useful for large or complex roofs where ground-level access is limited.

Prioritizing repairs on a slate roof requires a balance of urgency and cost-effectiveness. Think of it like triage in a hospital – you address the most life-threatening issues first. I begin by identifying immediate safety hazards, such as damaged areas that could lead to leaks or structural compromise. These take top priority. Next, I assess areas with significant water penetration or damage that could cause further, more extensive harm if left unrepaired. These typically involve repairing damaged slates, replacing damaged flashing, or addressing issues with the underlayment.

After addressing the urgent issues, I focus on cost-effective repairs, which are usually preventive in nature. This might involve cleaning debris, addressing minor chipping or cracking, or making minor repairs to the structure. My reports will clearly outline this prioritization, presenting a phased approach to repairs that balances immediate needs with long-term cost savings. This allows clients to budget effectively and plan maintenance accordingly.

One particularly challenging inspection involved a historic slate roof on a steep-sloped Victorian home. Access was extremely difficult and dangerous, requiring specialized safety equipment and a methodical approach. The roof was covered in thick moss and lichen, obscuring much of the underlying slate. This meant I had to carefully remove sections of moss to assess the condition of the slate beneath. I discovered significant damage due to frost heaves and decades of neglect. The difficulty lay in not just identifying the damage but also figuring out how to safely access and repair the damaged areas without further compromising the structure.

My solution was to use a combination of techniques: detailed photographic documentation, careful probing to assess the soundness of the underlying structure, and detailed measurements to quantify the extent of the damage. I then collaborated with a specialized roofing contractor experienced in working with historic structures to develop a safe and effective repair plan. The project required meticulous work and close coordination, and the successful completion was a satisfying testament to a careful, planned approach to even the most challenging situations.

Staying current in the field of slate roofing requires ongoing professional development. I actively participate in industry conferences and workshops, networking with other professionals and learning about the latest techniques, materials, and technologies. I subscribe to relevant trade publications and online resources to keep abreast of new research, best practices, and evolving standards. I also maintain contact with experienced slate roofers and contractors, exchanging knowledge and experiences. This ensures I remain at the forefront of the field, providing clients with the most up-to-date and effective solutions.

Further, I actively seek out continuing education opportunities offered by organizations such as the National Roofing Contractors Association (NRCA) to maintain my certifications and proficiency. This commitment to continuous learning is crucial for providing high-quality, compliant inspections.

My salary expectations for this role are commensurate with my experience, expertise, and the market rate for experienced slate roof inspectors in this region. I’m confident that my extensive knowledge and skills in this specialized area will contribute significantly to your organization. I’m happy to discuss my salary expectations further in a more detailed conversation after reviewing the full job description and responsibilities.