Embedded Files
Learning How to call out and create Scopes of work and Material lists
To view full slide show training which includes real life scenarios, please direct yourself to the Design & Engineering Google drive. Power point can be found under "Tools and References"
Training Module: Assessing Structural Upgrades in Attics for Solar Panel Installation
When installing solar panels, it's crucial to assess the structural integrity of the attic and roof. This training will help you identify when structural upgrades are needed and understand the reasons behind these upgrades. Ensuring the roof can support the additional load from solar panels is essential to maintain safety and efficiency.
Understanding the Load Requirements
Why is it important?
Solar panels add significant weight to the roof structure. Beyond the panels themselves, racking systems, wiring, and potential snow or wind loads increase the overall burden on the roof.
Ensuring the roof can handle this extra weight is crucial to prevent structural failure, which could result in damage to the building, the solar system, and potential safety hazards.
When are upgrades needed?
When the current roof load capacity is insufficient: If the roof was not initially designed to support additional loads beyond its existing structure, upgrades might be necessary.
In regions with heavy snow or wind loads: Areas prone to heavy snow accumulation or strong winds require more robust roof structures to handle the combined load.
For older buildings: Roofs that are several decades old may have deteriorated or used outdated materials that do not meet modern load-bearing standards.
Upgrades may include:
Reinforcing existing rafters or trusses.
Adding additional support beams or posts.
Installing stronger, thicker sheathing.
Evaluating Roof Structure and Condition
Why is it important?
The overall condition of the roof and attic structure determines whether they can safely support solar panels. A weak or deteriorating roof could fail under the added stress.
When are upgrades needed?
Visible signs of damage or wear: Cracked, sagging, or rotting rafters, trusses, or sheathing require repair or replacement.
Compromised roof decking: If the roof decking (the surface on which shingles are placed) is weak or deteriorating, it may need to be replaced or reinforced.
Pest or water damage: Signs of termite damage, mold, or water infiltration suggest that the structure's integrity may be compromised, necessitating repairs before solar installation.
Upgrades may include:
Replacing damaged or rotting wood.
Reinforcing or replacing weakened trusses or rafters.
Installing new, moisture-resistant materials to prevent future damage.
Assessing the Roof’s Age and Material
Why is it important?
The type of materials used in the roof and their age can significantly affect the structure's ability to support solar panels. Older roofs may have degraded over time, while some materials are inherently weaker.
When are upgrades needed?
Roofs nearing the end of their lifespan: Roofs that are 20-30 years old may need to be replaced before solar panels are installed to ensure they remain durable for the lifespan of the solar panels.
Roofs with low-quality materials: Roofs made from materials like untreated wood or older composite materials may not provide sufficient support without reinforcement.
Flat or low-slope roofs: These types of roofs may require additional support or a different approach to solar panel installation to ensure proper load distribution.
Upgrades may include:
Re-roofing with stronger, more durable materials.
Installing a support structure specifically designed for flat or low-slope roofs.
Reinforcing or replacing outdated materials.
Local Building Codes and Permitting
Why is it important?
Adhering to local building codes is essential for safety and compliance. Structural upgrades may be required to meet these codes, especially when adding significant loads like solar panels.
When are upgrades needed?
Non-compliance with local codes: If the current roof structure does not meet local building codes for additional loads, upgrades will be required.
Permit requirements: Some jurisdictions may require specific upgrades or inspections before issuing permits for solar installations.
Upgrades may include:
Consulting with a structural engineer to ensure compliance with local codes.
Making any necessary modifications to meet code requirements, such as adding bracing or reinforcing key structural elements.
When to Consider Structural Upgrades
Insufficient Load Capacity
Scenario: If the existing roof structure wasn't designed to support additional loads.
Indicators: Age of the building, original construction design, type of materials used.
Upgrades Needed: Reinforcement of rafters, trusses, or adding new support beams.
Visible Damage or Deterioration
Scenario: Presence of cracks, sagging, or rotting in the attic’s structural components.
Indicators: Sagging roof lines, cracked rafters, moisture damage.
Upgrades Needed: Replacement or reinforcement of damaged structural elements.
Roof Age and Material Considerations
Scenario: Older roofs or those made with less durable materials.
Indicators: Roofs nearing the end of their lifespan (typically 20-30 years), materials like untreated wood.
Upgrades Needed: Re-roofing, replacing outdated materials with stronger, more durable options.
Roof Type and Design
Scenario: Unique roof designs such as flat roofs or low-slope roofs.
Indicators: Non-traditional roof shapes, potential for poor load distribution.
Upgrades Needed: Custom-engineered supports, reinforcements tailored to the roof’s design.
Materials List for Structural Upgrades in Attics for Solar Panel Installation
Lumber and Wood Products
Dimensional Lumber: Typically used for reinforcing rafters, trusses, or adding new support beams. Common sizes include 2x4, 2x6, 2x8, and 2x10.
Plywood or OSB (Oriented Strand Board): Used for reinforcing or replacing roof decking. Plywood is generally preferred for its strength, while OSB is more economical.
Engineered Wood Products (e.g., LVL - Laminated Veneer Lumber): Often used for adding structural beams due to their high strength and stability.
Metal Connectors and Fasteners
Joist Hangers: Metal brackets used to secure joists to beams or other structural members.
Simpson Strong-Tie Brackets: A popular brand of metal connectors used to reinforce connections between wood members.
Nails and Screws: Specifically, galvanized or stainless-steel fasteners are recommended for their resistance to corrosion.
Lag Bolts: Heavy-duty bolts used for securing beams and other large structural members.
Reinforcement Materials
Steel Plates or Angles: Used for reinforcing connections between structural members, particularly in areas with high load demands
Metal Strapping: Strapping can be used to tie rafters or trusses together, providing additional support against wind or seismic forces.
Rod Bracing: Steel rods used to reinforce trusses or other structural components that may need extra support.
Sheathing and Roofing Materials
Roof Sheathing: As mentioned, plywood or OSB is commonly used, with thicknesses ranging from 1/2" to 3/4", depending on structural needs.
Roofing Felt or Underlayment: Installed under shingles to provide an additional moisture barrier.
Moisture-Resistant Sheathing: For areas prone to moisture issues, using treated or moisture-resistant sheathing is recommended.
Page updated
Report abuse