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Having gone off SIPS for a variety of reasons I had hoped to use an i-stud system for the timber frame element of our build. One attraction is the lack (or reduction) of thermal bridging which hopefully eliminates the need for an external layer of insulation - keen to avoid celotex or similar if possible and keep things breathable. This simplifies the build and gets it weather tight that bit quicker - important for our DIY fit out. I also have a preference for flexible insulation as it will also be a DIY job - a 220mm istud full filled with 0.032 glass batts looks to give 0.12/0.13 U value which is better than my target at an acceptable wall thickness. Unfortunately none of our local timber frame firms seem to do i-stud frames which surprised me. Other than Touchwood (quoted - v.expensive) does anyone have a recommendation for an istud supplier? We're in Cornwall. Alternatively how badly would a 190 or 215 solid timber frame suffer from cold bridging and if the answer is badly what level of external insulation would be need to avoid the problem? As always, opinions / alternatives welcome!
