[Strawbale] Alternative tightening materials

[Sara Tommerup]

Thank you very much, Mark,
Could you please give me a bit of description of what I am looking at.
The name and type of material: the floor, the strawbale and the tape
connecting it. There is some paper down as well, is that a part of it?

kindly

sara

On Mon, Mar 7, 2011 at 8:47 PM, Mark Depreeuw <markdepreeuw at belgacom...> wrote:
> 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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>
>
> --
> 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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>
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>
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