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Straw bale construction. Straw bales can also be used as part of a Spar and Membrane Structure (SMS) wall system in which lightly reinforced 5–8 cm (2.0–3.1 in) sprayed concrete skins are interconnected with extended X-shaped light rebar in the head joints of the bales. [22]
[2] [3] In a strawbale house, a truth window is often used to show the walls are actually made from straw bales. A small section of a wall is left unplastered on the interior, and a frame is used to create a window which shows only straw, which makes up the inside of the wall. [4] Many designs exist for truth windows.
Straw bales can be used as a basis for walls instead of drywall. Straw provides excellent insulation and fire resistance in a traditional post-and-beam structure, where a wood frame supports the house. [3] These straw walls are about 75% more energy efficient than standard drywall and because no oxygen can get through the walls, fire cannot ...
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The Straw Bale House, 1994). Using a straw bale in-fill sandwich roof greatly increases the R value. This compares very favorably with the R-19 (RSI-3.35) of a conventional 2 x 6 insulated wall. When using straw bales for construction, the bales must be tightly-packed and allowed to dry out sufficiently.
Straw is an abundant agricultural waste product, and requires little energy to bale and transport for construction. For these reasons, straw bale construction is gaining popularity as part of passive solar and other renewable energy projects. [3] Wheat straw can be used as a fibrous filler combined with polymers to produce composite lumber. [4]
Typically, bales created on farms with mobile machinery have been used ("field-bales"), but recently higher-density "recompressed" bales (or "straw-blocks") are increasing the loads that may be supported; where field bales might support around 600 pounds per linear foot of wall, the high density bales bear up to 4,000 lb./lin.ft.
Building a wall out of cob Cob , cobb , or clom (in Wales) is a natural building material made from subsoil , water, fibrous organic material (typically straw ), and sometimes lime . [ 1 ] The contents of subsoil vary, and if it does not contain the right mixture, it can be modified with sand or clay.