Dear Mike;In my old house, I installed my own Velux skylight with low e glass, argon filled, just like the basic comfort model your link refers to. That skylight served us well for 16 years and is still looking great with the the homes new owners.The comfort plus model adds a sheet of laminated glass, which is harder for a thief to break through, or perhaps a rock to break through but the glass could still crack under either of those conditions.The thicker low e coating certainly wont add much to the windows 'R' factor, not so much that you would notice.

1. Tempered Glass Vs Safety Glass
2. Laminated Vs Tempered Glass Skylight Panels

Tempered glass and laminated glass have different properties. They are two different types of glass but can be used together in some applications. Laminated, tempered glass is a common marriage of the two types of glass. Separately, each type of glass has useful applications.

When you add a skylight, and take away the R20 to R40 you might have in your roof insulation, you know you are going to be losing heat. Its just that the thing looks so great!I think you should buy the regular version, the fancy glass would be hellishly expensive to fix if it ever got broken.By the way, make sure you have access to clean the skylight from the outside.

Pigeons love them too!Best RegardsAdrian D. I am not sure what Velux means by a double layer LowE coating.

Tempered Glass Vs Safety Glass

There isn't such a thing.A softcoat LowE coating consists of multiple layers of metal and metal oxides that are microscopically thin and are virtually invisible to the eye. The working part of a softcoat LowE is a layer of silver and Loe2 means that there are two silver layers in the coating.

Laminated Vs Tempered Glass Skylight Panels

Velux's 'coater' does not make a 'double layer' coating. Leave it to marketing folks to screw up the technical info!Laminated glass in a skylight is safer than tempered. If laminated glass breaks, it stays in the frame and you don't have glass raining on your head and you don't have a hole in your roof.In some applications, laminated is required by code.That said, in 75% of cases tempered is probably sufficient and laminated is probably overkill.I like the idea of laminated overhead, but it is personal preference.