[Greenbuilding] heat treated wood siding

[Aaron Stavert]

Sacie - 
Here is a link to a company here in Canada.  If you click on the technology
section there are some great resources and explanations there.
http://www.thermalwoodcanada.com/

Aaron Stavert, MRAIC
Open Practice Inc. - Collaborative Architecture
63 Pownal St.  Charlottetown, PE
C1A 3W2

902 370-2086 p
902 370-2087 f


aaron at openpractice.ca
openpractice.ca



On 15-11-12 10:23 PM, "John Salmen" <terrain at shaw.ca> wrote:

> There was some discussion of this 'torrefaction' as a wood preservative
> treatment - there were some french companies involved at the time. Flame
> treating or charring and burnishing of wood surface was a traditional
> Japanese exterior wood technique and I have done that on a few projects (yes
> architecty/finicky) but can be done with some modern tooling and the results
> are stunning. The traditional approach was burning the surface of the wood
> with brazier heated irons and then laboriously burnishing the char off the
> wood. The heating would affect the top 1/4" or so of the wood (similar to
> torrefied) and the burnishing would polish off the sacrificial carbon
> ('staining') components and leave the wood with a burnished grey appearance
> that are quite stable both in colour and texture. In reproducing this we
> used large torches and metal and synthetic burnishing (texturing) wheels.
> There are acid treatments (life time/ valhalla) that leave a similar
> appearance. 
> 
> Depending where you live the 'elements' will typically take close to a
> century to erode a 1/4" off the surface of raw untreated wood so typically
> wood doesn't need treatment if it has enough sacrificial depth. If the wood
> is finished it is the finishes that need renewal - and often the finishes
> trap moisture (more typical of older oil finishes - less a concern with
> breathable). 
> 
> What the burning or acid treatments do is give a natural and neutral aged
> grey finish to wood buildings that otherwise would take quite a while to
> achieve that. After all it took me over 50 years to get that appearance.
> 
> 
> 
> -----Original Message---
> From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
> On Behalf Of John Straube
> Sent: November-12-15 5:17 PM
> To: Green Building
> Subject: Re: [Greenbuilding] heat treated wood siding
> 
> I am assuming Sacie you mean heat treated for cladding, not kiln dried or
> heat treated to kill bugs for shipping pallets For those who dont know about
> this process google "heat treated wood cladding" and you can read about it.
> It involves heating to 180-200 C/350-400F or so.  It causes a reduction in
> ductility, but apparently significantly enhances durability.
> One technique that is a bit less controlled is to flame treat the wood and
> char it. Some people like the look (e.g. architects) but it is a finicky
> process and often run off from rain results in significant staining.
> The controlled Scandinavian process of heat treating results in some
> excellent durable products, especially if it is painted right after (as a
> lot of this product apparently is). The common method is to heat in an inert
> gas atmosphere, but I have heard that hot oil is also used and has
> advantages It seems that it is quite durable, a natural pressure treatment.
> 
> On Nov 12, 2015, at 4:56 PM, Sacie Lambertson <sacie.lambertson at gmail.com>
> wrote:
> 
>>  I am interested in this group's opinion about using heat treated wood on
> the exterior of a house in NE Kansas?
>>  
>>  Thanks, Sacie
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> 
> John F Straube
> jfstraube at uwaterloo.ca
> www.JohnStraube.com
> 
> 
> 
> 
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