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?
Regards, Jure 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 Slovenia Tel.: +386 5 720 22 44 Fax: +386 5 720 22 40 Mobile: + 386 51 630 575 www.sport-hotel.si e-mail: jure@sport-hotel... www.dos-extreme.si skype: jure.pozar Bodi resnicoljuben: nikoli se ne pretvarjaj. Resnica vedno zmaga Be truthful: never pretend. The truth always wins
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