To quickly summarize, I'm replacing a plastic bubble window with a skylight
window on a sun room roof with a rubber liner.
(liner might not be the correct term but instead of shingles it is all
I removed the window and the wooden curb it sat on while keeping the rubber
that wrapped the curb somewhat intact. This allows the skylight window to
sit flush over the existing hole. The rubber was peeled off the existing
curb and is still attached to the rest of the rubber roof, it now hangs
I'm thinking that to properly install the light I should lay down some roof
cement about 3 inches wide, 1/4 inch thick around the entire window hole
UNDER the rubber , just peel back the rubber and place something to hold
it.Then place the skylight window on the hole and the flashing sits on top
of the cement. When the window is properly adjusted screw it to the roof,
place more cement over the entire flashing and screws, lay the rubber over
the cement and trim it so that it sits nice an flat against the roof cement
/ window flashing. Finally a little more cement over the rubber where the
seams are and the edge where the rubber meets the flashing.
I think that'll do it. Does that sounds correct? It is similiar to the
actual directions for the window but those are explaining from a shingled
roof point of view.
Now as far as the cement is concerned, I have a gallon of Henry 208 wet
patch roof cement. I have this from another project I was working on and I'd
like to know if that is ok to use for this project. I've seen in the
hardware store others that read 'Plastic roof cement' and I wasn't sure if I
should be using that instead? What is the plastic part of it ? is it made
Thanks for reading and any advice you have.