SIGMA OP3 - Timber

This wall type is ideal for very high performance designs, where air tightness less than 3, very low U-values, separate services cavity, air barrier and thinner wall build up are desired.

This system utilises the existing 89mm or 140mm stud options and introduces a separate rigid insulation overlay, dedicated service zone and conventional Plasterboard, in combination with fibre insulation between the studs. U-values ranging from 0.26 0.15 can be achieved. Typically this would be specified for CSH Level 5, Section 7 gold rated, advanced FEES compliance or Passive Haus Homes.

Sigma OP3 has the following benefits:

Separate air barrier membrane
Retains 89 or 140mm studs, for manual or crane erection
Limits wall thickness and maintains existing foundation
Reduces thermal bridging
Provides separate services zone, in front of air barrier
Can be air tested before 1st fix, but after weather tight
Utilises conventional skills and materials