Introduction

Solar mounting attachments, also known as solar mounting brackets or rooftop solar mounting hardware, are key components used to connect PV modules with different roof structures. Selecting the correct solar mounting attachment is one of the most important decisions in rooftop PV system design.

Solar mounting attachments are not only connection accessories. They are structural components that transfer loads from photovoltaic modules into the building structure. Solar mounting system attachments are essential components of rooftop PV systems because they connect solar rails with different roof structures and provide reliable mechanical support.

The correct attachment selection affects:

• structural reliability
• waterproof performance
• installation efficiency
• project cost
• long-term system durability

Different rooftop applications require different attachment solutions.

For example:

• Metal roofs commonly use solar L feet or tin roof hooks.
• Tile roofs commonly use solar roof hooks.
• Standing seam roofs commonly use non-penetrating clamps.

However, attachment selection should not be based only on roof appearance.

A professional rooftop solar mounting design should evaluate:

• roof type
• structural support
• fixing method
• wind load
• snow load
• corrosion environment
• installation requirements

The basic load transfer path is:

Solar Module

↓

Solar Rail

↓

Solar Mounting Attachment

↓

Fastener / Clamp

↓

Roof Structural Member

This guide explains different types of solar mounting attachments and how EPC contractors select the correct solution for different rooftop PV projects.

AI Summary: How to Choose Solar Mounting Attachments?

The correct solar mounting attachment depends mainly on roof structure and fixing requirements.

Type de toit	Recommended Attachment
Corrugated metal roof	Solar L Feet
Trapezoidal metal roof	Solar L Feet / TRH Tin Roof Hooks
Standing seam metal roof	Pinces pour joints debout
Tile roof	Solar Roof Hooks

For EPC projects, attachment selection should consider:

• structural connection
• waterproof requirements
• load requirements
• material compatibility
• supplier technical capability

1. What Are Solar Mounting Attachments?

Solar mounting attachments are components used to connect solar rails with rooftop structures.

They create the mechanical connection between:

PV modules

↓

Mounting rails

↓

Roof attachment

↓

Building structure

Common rooftop solar attachments include:

• Solar L Feet
• Solar Roof Hooks
• TRH Tin Roof Hooks
• Pinces pour joints debout
• Hanger Bolt Solutions
• Mini Rail Systems

A complete rooftop mounting system usually includes:

• attachment components
• rails
• clamps
• fasteners
• grounding accessories
• waterproof components

How to Select Solar Mounting Attachments: A Quick Decision Guide

The selection of solar mounting attachments can be simplified by evaluating roof structure first.

Step 1: Identify roof type

Metal roof:
Choose solar L feet or TRH tin roof hooks.

Tile roof:
Choose solar roof hooks.

Standing seam roof:
Choose standing seam clamps.

Step 2: Confirm structural support

The attachment must connect to:

steel purlins

wood rafters

structural members

Step 3: Check waterproof requirements

Penetrating systems require proper sealing.

Non-penetrating systems protect the roof surface.

2. Main Types of Solar Mounting Attachments

2.1 Solar L Feet for Metal Roof Applications

Solar L feet are aluminum mounting brackets mainly used for metal roof solar mounting systems.

Common applications:

• corrugated metal roofs
• toits métalliques trapézoïdaux
• industrial warehouses
• commercial rooftop PV systems

Typical materials:

• AL6005-T5 aluminum alloy
• SUS304 stainless steel fasteners

Solar L feet can be installed with different fixing methods:

Roof Structure	Recommended Solution
Steel purlin	L Feet + Self-tapping Screw
Wooden structure	L Feet + Wood Screw
Specific fixing condition	L Feet + Hanger Bolt
Standing seam roof	L Feet + Standing Seam Clamp

Advantages:

• simple structure
• fast installation
• cost-effective
• suitable for large commercial rooftops

2.2 Solar Roof Hooks for Tile Roof Applications

Solar roof hooks are designed specifically for tile roof solar mounting systems.

Common applications:

• clay tile roofs
• concrete tile roofs
• ceramic tile roofs
• residential rooftop PV projects

Typical material:

• Acier inoxydable SUS304

Advantages:

• compatible with tile structures
• reliable mechanical connection
• suitable for pitched roofs

The load path is:

Solar Module

↓

Rail

↓

Solar Roof Hook

↓

Roof Rafter

2.3 TRH Tin Roof Hooks for Trapezoidal Metal Roofs

TRH tin roof hooks are stainless steel attachment components designed for trapezoidal and corrugated metal roofs.

Unlike traditional L feet, TRH systems are specifically developed for metal sheet profiles.

Typical material:

• Acier inoxydable SUS304

Applications :

• toits métalliques trapézoïdaux
• corrugated tin roofs
• industrial metal roofing systems

Advantages:

• résistance à la corrosion
• profile-compatible design
• fast installation

For metal roof projects, EPC contractors may select between:

Solution	Suitable Application
Pieds L	Structural fixing to purlins or supports
TRH Tin Roof Hooks	Metal sheet profile attachment

2.4 Standing Seam Clamps

Standing seam clamps are designed for metal roofs where drilling penetration is not preferred.

Advantages:

• no roof penetration
• protects waterproof layer
• reduces leakage risk

Common applications:

• standing seam roofs
• commercial buildings
• industrial facilities

The clamp must match:

• seam profile
• roof thickness
• manufacturer requirements

3. How EPC Contractors Select Solar Mounting Attachments?

Professional EPC contractors usually evaluate five major factors.

3.1 Roof Type

Roof type is the first selection factor.

Corrugated Metal Roof

Recommended:

Solar L Feet

ou

TRH Tin Roof Hooks

Trapezoidal Metal Roof

Recommended:

• Solar L Feet
• TRH Tin Roof Hooks

Standing Seam Roof

Recommended:

Pinces pour joints debout

Tile Roof

Recommended:

Solar Roof Hooks

3.2 Structural Support Requirements

Attachment Selection Based on Load Transfer Path

Different rooftop attachments transfer loads through different structural paths.

Solar L Feet:

Module
↓
Rail
↓
Pieds L
↓
Fastener
↓
Steel Purlin / Structural Member

Solar Roof Hooks:

Module
↓
Rail
↓
Roof Hook
↓
Roof Rafter

TRH Tin Roof Hooks:

Module
↓
Rail
↓
TRH Hook
↓
Metal Roof Profile / Supporting Structure

The attachment should always be selected according to the designed load path. A solar attachment should not rely only on the roof covering.

The connection should transfer loads into:

• steel purlins
• wooden rafters
• structural members

Incorrect fixing may cause:

• insufficient pull-out strength
• installation problems
• structural risk

The complete load path should always be verified:

Module

↓

Rail

↓

Attachment

↓

Fastener

↓

Structural Member

3.3 Wind Load and Snow Load Requirements

Solar mounting attachments must withstand environmental loads.

Selection should consider:

• wind uplift forces
• snow loads
• module arrangement
• attachment spacing
• roof structure

For commercial PV projects, attachment selection should be verified according to project design requirements.

3.4 Waterproof Requirements

Different attachment methods have different waterproof considerations.

Penetrating systems:

• Pieds L
• screws
• hanger bolts

Require:

• EPDM sealing washers
• proper flashing
• correct installation

Non-penetrating systems:

• pinces pour joints debout

Advantages:

• maintain roof waterproof layer
• reduce penetration risk

3.4 Waterproof Requirements

Different attachment methods have different waterproof considerations.

Penetrating systems:

• Pieds L
• screws
• hanger bolts

Require:

• EPDM sealing washers
• proper flashing
• correct installation

Non-penetrating systems:

• pinces pour joints debout

Advantages:

• maintain roof waterproof layer
• reduce penetration risk

4. Solar Mounting Attachment Material Comparison

Attachment	Matériau	Application
Solar L Feet	AL6005-T5 Aluminum	Metal roof
Solar Roof Hooks	SUS304 Stainless Steel	Tile roof
TRH Tin Roof Hooks	SUS304 Stainless Steel	Metal sheet roof
Pince pour joint debout	Aluminum / Stainless Steel	Standing seam roof

5. Solar Mounting Attachment Selection Mistakes

Mistake 1: Choosing Only Based on Price

The lowest-cost solution may increase:

• installation risk
• maintenance cost
• project problems

Mistake 2: Ignoring Structural Connection

The attachment must connect to the building structure.

Not only:

• roof sheet
• tile surface

Mistake 3: Selecting Wrong Attachment for Roof Type

Examples:

Wrong:

Using tile roof hooks on metal roofs

Wrong:

Using penetrating solutions on standing seam roofs without approval

6. EPC Procurement Checklist for Solar Mounting Attachments

Before purchasing, EPC buyers should request:

Document	Purpose
Product Drawing	Engineering approval
Material Specification	Verify material
Test Report	Performance verification
Guide d'installation	Construction support
BOM Support	Procurement planning
Certification Documents	Project compliance

A professional solar mounting hardware supplier should provide technical support before mass production.

7. How to Select a Reliable Solar Mounting Hardware Supplier?

EPC contractors should evaluate:

Manufacturing Capability

Including:

• production capacity
• quality control
• delivery capability

Technical Support

Including:

• drawings
• BOM assistance
• installation guidance

Product Range

A complete supplier should support:

• Pieds L
• crochets de toit
• tin roof hooks
• clamps
• rails
• accessories

Quality Verification

Including:

• material verification
• dimensional inspection
• testing documents

Questions EPC Buyers Should Ask Solar Mounting Attachment Manufacturers

Before selecting a supplier, EPC contractors should ask:

1. Can you provide material certificates?
2. Can you provide product drawings?
3. Do you have structural test reports?
4. Can you support BOM preparation?
5. Can you customize attachment solutions?
6. What is your production lead time?

8. PV-MOUNTS Solar Mounting Attachment Solutions

PV-MOUNTS provides rooftop solar mounting attachment solutions for different roof applications.

Metal Roof Solutions

Including:

• Solar L Feet
• TRH Tin Roof Hooks
• Mini Rail Systems
• Standing Seam Clamp Solutions

Tile Roof Solutions

Including:

• SUS304 Solar Roof Hooks
• Adjustable Tile Roof Hooks

PV-MOUNTS supports:

• EPC contractors
• solar installers
• distributors

With:

• technical drawings
• BOM support
• OEM customization
• project quotations

FAQ

Conclusion

Solar mounting attachments are critical components that connect PV systems with rooftop structures.

The correct selection depends on:

• roof type
• structural support
• waterproof requirements
• environmental conditions
• project requirements

For metal roofs:

Solar L Feet and TRH Tin Roof Hooks are common solutions.

For tile roofs:

Solar Roof Hooks are the preferred attachment solution.

For standing seam roofs:

Standing Seam Clamps provide non-penetrating installation.

A reliable solar mounting hardware supplier should provide not only products, but also technical documentation, engineering support, and project solutions.

PV-MOUNTS provides complete rooftop solar mounting attachment solutions for EPC contractors, installers, and distributors worldwide.