stud wall - vapour barrier? insulation? (moved from Projects)

8 Sep 2012
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West Midlands
United Kingdom
i am making a new stud wall between a bathroom and main room en suite.

i have some questions.

  • Do i need to wood preserve the cls timber i do stud wall?
  • i am buying 3 x 2 finished timber. what screw size should i use?
  • do i need vapour sheet? if so what grade? do i put a layer each side? do i fix them under the timber? or should i just use foil tape? maybe staples
  • whats the best insulation to use.
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