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Velux FCM User Manual

Velux FCM
12 pages
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VAS 452195-2016-11
-60°
15°-90°
FCM
ENGLISH: FCM Curb Mounted Skylight Installation Instructions
ESPAÑOL: Instrucciones de instalación para tragaluz FCM montado en brocal
FRANÇAIS : Instructions d'installation du puits de lumière FCM monté sur cadre
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Velux FCM Specifications

General IconGeneral
ApplicationResidential and Commercial
Frame MaterialAluminum
Curb TypeSite-built curb
OperationNon-operable
Size RangeVarious sizes available
InstallationRequires professional installation

Summary

Important Installation Requirements

Roof Pitch Specifications

Roof pitch range (0-60°) and special notes for low pitches (<15°).

Flashing Compatibility

Details ECL (10-60°) and ECW (14-60°) flashing types for roof pitch compatibility.

Installation and Liability Disclaimers

Disclaimers regarding installer responsibility, laws, codes, and safety requirements.

Glass Safety and Breakage

Information on glass types (laminated/tempered) and breakage risks.

Planning and Clearances

Critical Area Clearances

Maintain specified clearances from critical roof areas like valleys and ridges.

Curb Construction and Dimensions

Curb Building Specifications

Specifications for curb lumber thickness (1/2") and minimum height (3.5").

Skylight Size and Flashing Chart

Chart detailing skylight sizes and corresponding exterior curb and flashing dimensions.

Roof Framing

Cyclonic Area Framing

Special framing requirements for cyclonic or high wind area installations.

Framing Installation Steps

Instructions for steps 2 (remove batten) and 3 (install framing members).

Light Shaft Integration

Step 5: Framing Details

Illustration of framing members and support battens for light shaft integration.

Skylight Curb Waterproofing

Applying Roofing Underlayment

Instructions for wrapping the skylight curb with VELUX roofing underlayment ZOZ 216.

Low Pitch and Snow Conditions

Waterproofing measures for low roof pitches (<15°) and potential snow accumulation.

Water-Shedding Lap Creation

Underlayment Laps on Curb

Detailed steps for creating water-shedding laps with underlayment on the curb.

Top Curb and Drainage Integration

Top Curb Underlayment Wrap

Procedure for wrapping the top curb frame with underlayment.

Felt Interweaving for Drainage

Interweaving felt with underlayment for proper drainage in new and retrofit applications.

Flashing Selection and Installation

ECL vs. ECW Flashing Types

Selection guide for ECL (thin roofing) and ECW (profiled roofing) flashing types.

Custom Flashing Options (A, B, C)

Considerations for using custom-made flashing options A, B, or C.

Final Skylight Mounting

Securing Skylight with Screws

Procedure for centering and securing the skylight using provided screws.

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