SIGMA OP2 - Timber

This wall type is ideal for designs where air tightness greater than 3, minimum U-values and thinner wall build ups than Sigma OP1, are desired.

This system utilises the existing 89mm or 140mm stud options and introduces thermal laminate Plasterboard, in combination with a partial fill polyurethane rigid insulation between the studs. U-values ranging from 0.37 0.14 can be achieved. Typically this wall solution suits projected 2013 regulations, CSH Level 4, FEES Compliance or Section 7 silver rated homes or Walls requiring thinner build ups than Sigma OP1.

Sigma OP2 has the following benefits:

Improved thermal performance, with a range of insulation thicknesses
Utilises plasterboard layer for air tightness delivery
Retains 89 or 140mm studs, for manual erection
Limits wall thickness and maintains existing foundation
Reduces thermal bridging
Services accommodated within studwork and space formed in front of the rigid Insulation
Utilises conventional skills and materials
Option of factory fitted rigid insulation to achieve UKTFA class B fire protection during construction
Offers thinner wall build up than Sigma OP1