[Strawbale] Alternative tightening materials

[Mark Depreeuw]

hELLO.
 this is a picture with the joint between strawbale and the floor, a 
very delicat connection fot the airtightness.

succes
mark depreeuw
belgium




Sara Tommerup schreef:
> All who have joined this discussion, do you have any pictures of such
> details that you would be so kind to share with me?
>
> I will be using them for an essay for my studies comparing them with
> convential details. Please provide source for the photo, so i can
> accredit it.
>
> Thanx!
>
> sara
>
> On Mon, Mar 7, 2011 at 5:28 PM, RT <ArchiLogic at yahoo...> wrote:
>   
>> On Mon, 07 Mar 2011 01:14:52 -0500, David Neeley <dbneeley at gmail...> wrote:
>>
>>
>>     
>>> On a well detailed straw bale in which you have paid attention to air
>>> sealing, don't you then run the opposite problem--having inadequate air
>>> changes?
>>>
>>> Would it not in such case be prudent to also install an energy recovery
>>> ventilator?
>>>       
>>> On 03/06/2011 11:02 PM, RT wrote:
>>>       
>>>> strawbale construction methodology is inherently conducive to yielding
>>>> air-tight buildings
>>>>         
>> I don't think that there is any question of the necessity of paying careful
>> attention to air-sealing
>> with any well-insulated building, whether it has straw in the walls or not.
>>
>> Any air-leakage point is a point where bulk moisture from conditioned
>> interiors will find its way into the envelope materials and condense
>> somewhere within the cross section.
>>
>> Once that moisture is in liquid form, it becomes more difficult (than if it
>> were in vapour phase) for that moisture to get out again even if the skin
>> materials are vapour permeable. (ie vapour permeable is not liquid
>> permeable).
>>
>> So what you have is moisture hanging around for a long time and like
>> teenagers with too much time on their hands, trouble (in the case of
>> building materials, microbial activity) is sure to ensue.
>>
>> If one is relying upon air leakage through the envelope materials to provide
>> the necessary ventilation air changes, then that ventilation air is going to
>> be passing through mould/mildew/crud infested materials before entering the
>> indoor air environment -- certainly not a scenario that is conducive to
>> creating healthful living space.
>>
>> So if air-tight construction is a necessity with well-insulated buildings to
>> preserve the integrity of the materials and avoid potential deleterious
>> health consequences to the building's occupants, then it necessarily follows
>> that a ventilation strategy be implemented as well to ensure the necessary
>> air changes to provide good indoor air quality.
>>
>> And since the minimum (ie the worst that the Codes will allow) ventilation
>> rate requires that the entire
>> volume of air inside the house (air which you have spent energy to
>> condition) be changed a minimum of ~8.4 times a day  ... (ie you need to the
>> empty the house of air that has been heated/humidified to 18-21 degC /~20 -
>> 25% RH and replace it with fresh outdoor air (which might be at minus 20 or
>> minus 40 degC and containing almost no moisture) that has to be warmed up to
>> 18 - 21 degC at least eight and a half times every day ... and since any
>> energy recovery ventilator worth considering will recover 75 to 95 percent
>> of the energy from the stale air exhaust stream, I think that the choice is
>> a no-brainer (and a Code requirement here in Ontario).
>>
>>
>> --
>> === * ===
>> 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"
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>>
>>     
> ____________________________________________________
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>
> Send all messages to:
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>   


-- 
Mark Depreeuw - Architect-stedenbouwkundige
bio-ecologisch ontwerpatelier Archi  4
Moorkensplein 17
2140 Borgerhout
Tel.:03/236.68.54
Fax.03/235.79.06

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