[GSBN] windscreen

[Jim Carfrae]

Thanks, John.
I wrote a paper for a conference in 2009 with these findings in it. 
I don't know if I can attach it to this email to make it available to all, but I'll try.

Jim 

Jim Carfrae
PhD Research Student

Room 119, Reynolds Building
University of Plymouth
Drake Circus
Plymouth
PL4 8AA

jim.carfrae at plymouth.ac.uk
07880 551922
01803 862369
________________________________________
From: GSBN-bounces at greenbuilder.com [GSBN-bounces at greenbuilder.com] On Behalf Of John Straube [jfstraube at gmail.com]
Sent: 22 January 2011 13:03
To: (private, with public archives) Global Straw Building Network
Subject: Re: [GSBN] windscreen

Well Jim that is darn useful stuff!   have you done a paper or something on this?  Would be great to have this info to spread around.



On 2011-01-22, at 5:25 AM, Jim Carfrae wrote:

> As part of my research into the moisture performance of SB in a Temperate Maritime (Damp) Climate , I've monitored two structures where a direct comparison can be made between a plain lime rendered section of wall adjacent to a section of the same wall protected by a ventilated timber rainscreen.
> (Plain lime wall = 3 x 12mm coats. Rainscreen = 1 x 12mmm scratch coat, 25mm vented void, permeable membrane, 25 mm vented void, vertical timber boarding with 5mm gaps)
> In each case the average moisture content of the straw just behind the render was between 3% and 4% lower (typically 17% behind plain render, 13% behind rainscreen)
> This is an apreciable difference, especially as this was not a particularly exposed site. If there was significant driving rain I would expect the difference to be higher.
>
> To reinforce what John Straube said - It has to be vented top and bottom.
>
> Jim (moist) Carfrae
>

Dr John Straube, P.Eng.
Associate Professor
University of Waterloo
Dept of Civil Eng. & School of Architecture
www.buildingscience.com

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