[Cob] Roof overhangs vs Gutters!

[Gergo Szekely]

Hi,

There is another reason for having an overhang on a building and it is to keep 
the hot summer (late spring / early fall) sun out. Using the sun for passive 
heating we would like to let the winter sun come in through the windows and keep 
the summer sun out. It is especially true for the South side of the building in 
the northern hemisphere and the North side of the building in the southern 
hemisphere.

http://www.horizonpower.com.au/images/smart_ways/sun_angles.gif

Caution: the angles are different based on your Latitude.

Best,
--
Gergo



________________________________
From: Ocean Liff-Anderson <ocean at fireworksvenue.com>
To: coblist at deatech.com
Sent: Tue, August 3, 2010 10:52:10 AM
Subject: Re: [Cob] Roof overhangs vs  Gutters!

Gutters would alleviate the need for the large overhang.  But the roof/gutter 
joint area must be absolutely watertight - any rain flowing/leaking through into 
the cob wall will cause collapse!



On Aug 3, 2010, at 3:25 AM, Christopher Higgo wrote:

> Hi,
> 
> I want to build a one-and-a-half storey cob house. The architectural 
>restrictions in the area I live in in Cape Town call for clipped eaves; so no 
>overhang. But the area, in winter, has quite a lot of wind-driven rain. This 
>combination got me worried about the walls lasting. But after seeing many 
>pictures of old cob buildings in wet climates which are double-storey and have 
>double pitched roofs (so 2 of the 4 exterior walls are completely exposed, and 
>the ground floor is exposed all the way around), that have lasted a couple of 
>centuries, I have begun to question the common wisdom about the absolute 
>necessity of overhangs.
> 
> What do you think? Are they absolutely necessary or can a good lime rendering 
>alone protect the walls from rain?
> Has anyone built a lasting cob structure in a winter rainfall area without roof 
>overhangs?
> 
> One example: 17th Century cob cottage in Devon, double storey, double pitched 
>roof, clipped eaves.
>http://www.english-country-cottages.co.uk/sites/english-country-cottages/pages/PropertyDetails_C.aspx?QS=2B831DC8-E0A4-4868-B1DF-DDB2FE4FD44A~C~HEEA~HCG~216~GBP~4~0~~A~N~1~BAE699D2-1219-6505-7A07-AC378919C91A~7207~0~6~N~N~N~N~N&awc=2393_1280828513_9855889cfdfe451ac1e59568f698e864
>4
> 
> Christopher
> 
> 
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