[Cob] skylight design

[tabitha and karl o'melay]

i've never made a skylight but installed many and taken apart and 
repaired a few.
the common theme in them is:
	they are almost always mounted on a parapet
	the glazing is usually sloping for condensation run off
	condensation sheds to an exteriorly connected "drip channel" (tiny 
holes from the inside to the out)
	double glazing keeps water condensation to a minimum

as far as flashing goes. i use a thing called a "saddle" manufactured 
out of metal and specifically designed to shed water to the sides where 
step flashing is used.

i know these are construction industry solutions but the idea is proven
and should be considered when making a homemade "re-solution"

me? since i have access to used sheet copper "old solar collectors" i'd 
make my own saddle out of copper & solder it together.

on a flat roof i'd build the parapet & be sure the roof membrane is 
installed clear up the sides to the glazing frame.

defs:
a skylight parapet is a box lifting the window/glazing at least 8 
inches(or reasonable snow depth) off the roof
essentially putting the skylight in a relative "high point" on the roof

the saddle is a metal gutter keeping water from pooling in the parapet 
valley and forcing it to shed to the sides.

karl

On Dec 28, 2004, at 5:33 AM, Patrick Newberry wrote:

Yea, this is Pat.

I put a sky light over a recipical roof. It is that lexon glass with a
simple 2 x 4 frame (very odd shape like everything in my house) Since
the sky light is at the highest point of the house I've not had problems
with leaks. In the case of sky lights, higher is better, or at least
easier to keep from leaking. The sky light does collect condensation in
the winter but since, like everything in my house, the sky light is not
level, the condensations follows the glass to a single point and then
drips. My solution was to put a plant under that one spot. Now that
plant gets both light and water from my sky light!


Here is link to photo:  http://users.pstel.net/goshawk/0907f.htm


<snip>
And Pat Newberry has his earthbag/superadobe structure with a skylight
at
the top.  He may have other skylights as well, since he's pretty big on
daylighting.  And he's on this list.

http://users.pstel.net/goshawk/
</snip>




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