SSS Detail Strawbale Floor Plate
Straw bale insulated floor-plate as ceiling to (cold) cellar or on stripe-foundation (concrete) with outside insulation, construction similar to outside wall.
Beams (posts in wall): Two 14 x 6 cm structural timber connected with metal lash or wood (OSB or wooden boards), insulated with straw.
Materials Nr. 6: As the outside surface has to have a lower Sd-value (4:1), use diffusion-open DWD-roofboards or diffusion-open OSB on the lower surface. Detail is suitable for Low Energy or Passive Houses (depending on A/V-ratio and stories).
Advantages: airtight and windproof folies/boards are closed; thermal-bridge-free connection between foundation and wall; safe construction concerning water and moisture (closed levels inside and outside).
Attention Points: As DWD on the bottom of the floor-plate is not very mechanically claimable be careful when filling in the strawbales or use rough boards (underneath) additionally or more diffusion-open OSB board instead.