[Greenbuilding] Green roof drainage question

[RT]

On Sat, 23 Jul 2011 11:59:08 -0400, Marilyn <cybercrone at eol.ca> wrote:

>  green roof put on the addition to my home,

> ground level is only about 2 inches below the door sill where I go out  
> there.


Dear Occidental Woman  
-with-not-a-drop-of-Chinese-blood-in-her-entire-family-who-mistakenly-thought-she-was-a-cousin-of-mine;

I think that I'd look at creating a dam around the vicinity of the door  
(say minimum of 1 metre wide by 1.5 metres out from the wall) that is aout  
20 cm higher than the maximum snow accumulations that would be experienced  
and enclose the "door well" with a light structure made of  
diverted-from-the-wastestream patio doors. (There are bazillions of 20-30  
year old tract homes and high-rise apts in the Greater Toronto Area which  
had single-glazed, aluminum-framed patio doors installed (ie two layers or  
single-glazed doors--4 leaves for an opening) many of which are probably  
ripped out annually and replaced with insulating glass units and they  
usually end up getting tossed. 2 openings-worth of discarded doors and a  
half-dozen sticks and you've got your doorwell enclosure. A DIY project  
that could be done quite easily some weekend).

The sidewall panels could be designed to be popped out for the non-snow  
months if desired.

The enclosure provides shelter to keep rain and snow away from the entry  
to the house and an airlock entry to boot.

-- 
=== * ===
Rob Tom
Kanata, Ontario, Canada
< A r c h i L o g i c  at  Y a h o o  dot  C A >
(manually winnow the chaff from my edress if you hit REPLY)