Originally Posted by Evil Scotsman
How would I cap/finish the windows on the outside with asbestos shingles?Thank You
Installation would be much like that for retro-fitting a window into modern fiber-cement siding.
Hopefully, the shingles are installed over a weather resistant barrier (WRB), likely (given the age of the building) "builders felt" - this served somewhat the same purpose as a more modern WRB such as house-wrap ("Tyvek")
If so, you would install a "Z" flashing under
the WRB and out over the head trim on the windows. It would also be a very
good idea to install a pan flashing at the bottom of the window and out over the siding. (Some replacement windows have "self-flashing" features which according to the manufacturers makes a "Z" flashing unnecessary if the windows are installed according to the manufacturers instructions - many experienced installers are skeptical about the long-term performance of this arrangement in retrofit installations, and prefer to also install a head flashing as a "belt and suspenders" approach.)
You can get a general idea of the procedure from the right-hand Fig 3. here:
And from this article:
except that you will be working with the existing WRB rather than the house-wrap shown in the article.
Cutting the asbestos siding in such a way that the asbestos does not become friable is another issue entirely.