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Frequently Asked Questions
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Frequently Asked Questions
Skylight FAQ
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Does VELUX make custom-sized skylights?
VELUX does make some custom-sized skylights that vary from the standard sizes found online at TheSkylightStore. VELUX will make custom sizes for the FCM curb mounted skylight. For the other deck mount units, they will interchange standard widths and lengths for configurations not listed in the standard size list.

What glazing types does VELUX offer?
VELUX offers COMFORT tempered glass and COMFORTPLUS safety glass. Other special glass options are also available such as Impact glass for hurricane prone areas and tinted or opaque glass for commercial applications.

What glazing types are allowed (by building code) for glass skylights?
The short answer is laminated glass and in certain applications fully tempered glass. In almost every building code currently in use throughout the US, laminated glass with a 30-mil interlayer is listed as an acceptable glazing without limitations of use for skylights in normal circumstances. The exact building code language can be found in section 2405.2 of the International Building Code (IBC) titled “Allowable glazing materials and limitations” and section R308.6 “Skylights and sloped glazing” of the International Residential Code (IRC).

IBC Section 2405.2

IRC Section R308.6

The code intent is to protect occupied areas below skylights by only allowing skylights with safety glazing. Complying safety glazing materials include laminated, heat-strengthened, fully tempered and wired glass. Heat-strengthened and fully tempered glazings are both types of glass that may fall on occupants below when a skylight’s glass is broken. Wired glass is typically not used for skylights due to its tendency to crack from thermal stresses. For these three glazings, the code requires a retaining screen below the skylight to collect glass in the event of breakage. The exact building code language regarding the requirements of screens with skylights can be found in section 2405.3 of the IBC titled “Screening” and in sections R308.6.3, R308.6.4 and R308.6.5 of the IRC.

IBC section 2405.3

However, the building codes do allow exceptions where screens are not required for skylights using fully tempered glass.

What colors do VELUX skylights come in?
The cladding on the early FCM curb mounted skylight is black in color. All current skylight units, including FCM, are umber-grey, often called bronze in the industry. However, copper and special colors are available upon request.

What is a roof window?
A Roof Window is a unit designed for installation "in-reach". The Roof Window sash can be pivoted so you can clean the exterior pane of glass from inside the home. Some larger Roof Window models meet building code requirements for egress (emergency escape). Many times Roof Windows are installed in attics being used as living space. Skylights, on the other hand, are usually installed in "out-of-reach" applications.

Why is roof pitch important for skylight installations?
Each VELUX flashing kit is engineered with specific pitch requirements. The roof pitch is important because it ensures that the roof has the proper slope to effectively drain water off of both the flashing and the skylight. The roof pitch and the roofing material used are both important in determining the type of flashing needed.

Do I have to pay sales tax?
If your skylights are being shipped anywhere in the State of California you must pay sales tax.

Once I submit my order how will I know that it went through and when it will be shipped?
We will keep you informed throughout the entire process. From the submission of your order to the receiving of your product. Our order process is simple and keeps you up-to-date every step of the way.

How long will my Skylights take to get to me?
Most orders only take 2-4 business days to arrive at your door. Certain VELUX skylights require additional time. Specifically, if you require a custom-sized skylight or require non-standard glass options. If you're concerned about shipping times please call us for a shipping estimate: 1(800)638-1052 option #2.

How far do venting VELUX skylights such as the VS or QVM manual venting skylights open?
Smaller venting skylight sizes 101, 150 and 601 open 5". All other sizes open 10.25".

What do I use to manually operate my ventilating skylight or accessory?
For venting skylights and accessories installed out-of-reach, a ZCT 300 rod can be used. The rod and a ZAZ 090 cord pulley are required for a roller shade that is installed out-of-reach. For skylights installed within reach, a CHS/CHL handle can be used. Shades or blinds installed within reach are operated either by pulling a cord or turning a hook by hand or with a control rod.

What kinds of sunscreening accessories does VELUX offer?
What kinds of sunscreening accessories do you offer? VELUX offers roller shades, venetian blinds, cellular shades, and LIGHTBLOCK shades. An exterior HEATBLOCK awning is also available on limited models.

How do the sunscreen accessories stay flush with the skylight?
Sunscreening accessories are attached to the skylight frame or sash with mounting brackets. The sunscreening material is held next to the glass area with side rails.

How much light will a VELUX sun tunnel transmit?
The answer really depends on many factors including the roof orientation (i.e. South-facing is always best), the tunnel length, tunnel angles, time of day, season of the year and other factors. Typically, the 14-inch diameter is best for lighting up bathrooms, halls, walk-in closets and areas up to 10' x 10'. The 22-inch diameter sun tunnel is perfect for lighting any type of room up to 15' x 15'.

Will the VELUX sun tunnel fit all roof types?
The VELUX TSF and TSR sun tunnels are designed for shingle or shake roofs with pitches from 15° to 60°. Tile roofs require a TTF or TTR sun tunnel..

How much will shipping cost?
The Skylight store is currently running a promtion that offers FREE SHIPPING on all VELUX products.

What are the retaining screen exceptions for the use of fully tempered glass skylights in commercial and residential applications?
In commercial applications there are no exceptions, laminated glazing is required for glass skylights.

In residential applications, glass skylights with the inboard glass fully tempered can only be used without a protective screen when all of the following conditions are met:
  • 1. The glass skylight area is 16 square feet or less
  • 2. The highest point of the glass in the skylight is 12’ or less above the floor
  • 3. The glass thickness of individual panes in a skylight are 3/16” or less
  • 4. IRC only – The other pane(s) are fully tempered, laminated or wired glass
Otherwise laminated glazing is needed for glass skylights in residential applications.

Some states elect to develop their own building codes in lieu of using the IBC and IRC. In these states, the building code requirements for use of glazing in glass skylights is the same as the IBC. In fact, the code requirements can also be found in the same section 2405.2 of these state codes. As with all externally mounted glazing systems, skylight glazings are also subject to other building code sections related to structural, wind and blast performance. Always consult your local code official for building code requirements in the jurisdiction where skylights are being installed and for exceptions that may apply to the building code.
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