[Cob] Are roof overhangs absolutely necessary?

[ChrHstos AgΓel0p0ulos]

---------- Forwarded message ----------
From: ChrHstos AgΓel0p0ulos <fastardo at gmail.com>
Date: Tue, Aug 3, 2010 at 11:59 PM
Subject: Re: [Cob] Are roof overhangs absolutely necessary?
To: Christopher Higgo <christopher at lard.za.org>


If the house has been built in a place that most time of the winter is
raining, overhangs are neccecary to avoid replastering every couple of
years.
Also overhangs could be essential when you have strong wind flows that give
an angle to the rain driving it directly on your wall. Extending (lets say
30cm) your roof you leave only the bottom of the wall(which is built by
stone) to get wet.

On Tue, Aug 3, 2010 at 1:25 PM, Christopher Higgo
<christopher at lard.za.org>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<http://www.english-country-cottages.co.uk/sites/english-country-cottages/pages/PropertyDetails_C.aspx?QS=2B831DC8-E0A4-4868-B1DF-DDB2FE4FD44A%7EC%7EHEEA%7EHCG%7E216%7EGBP%7E4%7E0%7E%7EA%7EN%7E1%7EBAE699D2-1219-6505-7A07-AC378919C91A%7E7207%7E0%7E6%7EN%7EN%7EN%7EN%7EN&awc=2393_1280828513_9855889cfdfe451ac1e59568f698e864>
>
> Christopher
>
>
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