[Strawbale] 1. Re: Europe's largest strawbale building (Sport Hotel, Jure Pozar)

Sport Hotel, Jure Pozar jure.pozar at gmail...
Fri Nov 26 11:45:16 CET 2010

Dear Herbert and others,

 From what you wrote I am not 100% wrong like Bane wrote. There are many 
answers here which I appreciate but some are contradictionary. I realize 
you all say it would be best to use infill system, but the problem is we 
don`t have a company who does such timber structures that allows bale 
filling (they make too many diagonal timber hands which prevent 
strawbales to be filled, but such hands are neccesary for the winds we 
have here), so I have to start from what is available. I have a very 
trustworthy 3rd generation timber company who makes post & beam 
structures which are normally filled with celoulose and have no 
expirience in strawbales but they are willing to find a common solution. 
I am now attaching some of my house plans so you can have a better image 
of my project. We plan to make the concrete basement box, because we 
have to add material/soil around the house in order to elevate the 
ground, which is needed because of the type of terrain. Than we though 
to cover concrete with water proof layer and than put strawbale layer 
and boards over it. If the concrete is a bit elevated from the ground 
around the house I guess it wouldn`t be a problem (we would take special 
care in bathroom and kitchen of course).

Why not getting a company from abroad to build my house? Because than 
also the materials will come from abroad which I don`t want to - I want 
to have it local and this is where you are wrong Bane. Notranjska region 
of Slovenia is highly forested and timber industry has a long tradition. 
Out region is the biggest uninhabited forest area in the whole area, so 
we don`t lack timber but I have to admit I don`t know yet where the OSB 
plates come from - I will check of course. The second reason why not 
getting the outside contractor is the cost. We are planning to build the 
house for 140.000 - 150.000 EUR (including paperwork heating, solar 
panels, water tank, cleaning sump,..) - ready to move in. As far as I 
have checked the prices of similar houses for instance in Austria the 
prices get much higher.

If the roof would be well ventilated than it also shouldn`t be a problem.

The only problem I can see is double OSB plates on the inside. I guess I 
could use only one OSB layer and perhaps should plaster also the 
interior of the strawbales thus it would make double plastering on the 
inside of the strawbales.

May and others who opose OSB plates: when we use wooden baords/planks 
inside instead of OSB plates, can we do plastering in such way that 
there would be no cracking? Or we have to take the cracking as natural 
and live wirh it?



S, asbn piše:
> Dear Jure, just an addition...
>>>> 4. I am planning to do floor and roof isolation with straw bales as
>>>> well. I can remember a discussion from Belgium that it is not best to
>>>> put straw bales in the floor, but can`t remember the explanation why
>>>> not.
> If the floor (on poles or pillars or strip foundation) has an airspace of at
> least 30 cm underneath ­ so if it is ventilated, strawbales as insulation
> even in the floor are a good idea. The only problem is when water (from
> bathroom or kitchen) comes in the floor, in some houses we installed an
> EPDM-folie in the bathroom to prevent water going in the construction. This
> is, what we discussed in Belgium...
>>>> ..., or would it be better to put dip the straw bales in
>>>> clay before putting them on the roof, so it would such the moisture out
>>>> of them?
> Dipping strawbales brings much water in the strawbale-construction and lets
> the straw easier mould. So if you do that, you should let dry the bales in
> the sun before you use them as a building material.
>>>> ... there are only a few straw bale houses in Slovenia
>>>> and they are all done with infill design which is suitable for certain
>>>> regions, but not for where I live where we have big temperature
>>>> differences.
> If the wooden construction between the bales is made intelligent (e.g. with
> I-joists like Steico or with insulated posts) to prevent warmth-bridges, the
> thermal performance of an infill-construction is nearly the same as the
> "loadbearing" option.
> Due to the possibility to fix boards and other (installation) layers as well
> as the facade easily on such a wooden construction an infill-construction
> will have a better thermal performance than a wall with just strawbales (of
> the same dimension) and plaster on both sides, because the thermal
> performance depends on the humidity of the straw and on the airflow in the
> insulation layer, too. I would say: much more than on the density of the
> straw or some wooden posts in the construction.
> Mit lieben Grüßen
> Herbert Gruber


Jure Požar, dipl.org.tur./ general manager

HOTEL SPORT&   MTB park Notranjska
Kolodvorska c. 1, Postojna
Tel.: +386 5 720 22 44
Fax:  +386 5 720 22 40
Mobile: + 386 51 630 575
e-mail: jure at sport-hotel...
skype: jure.pozar

Bodi resnicoljuben: nikoli se ne pretvarjaj. Resnica vedno zmaga
Be truthful: never pretend. The truth always wins

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