Walls
Issues to ConsiderIssues to Consider - Masonry
Partial Fill Cavity Wall Insulation
Insulated Dry-Lining Plasterboard
Insulated Dry-Lining Plasterboard
Issues to Consider - Timber Frame
Timber Frame Insulation
  Walls - Timber Frame Insulation


INTRODUCTION
For timber frame wall constructions we recommend the use of Kingspan Kooltherm® K12 Framing Board (premium performance CFC/HCFC–free rigid phenolic insulation). The boards can be used between studs or alternatively as an insulating sheathing to eliminate cold bridging. Ideal for both newbuild or refurbishment.

Figure 1
Timber Frame Insulation
Premium Performancezero ODP
PRODUCT DATA
 ACHIEVING U–VALUES
Kingspan Kooltherm® K12
Framing Board
Board Size 2.4 x 1.2
Insulant Thickness(mm) Refer to local distributor or Kingspan Insulation price list for current stock and non-stock sizes.
Facings Composite Foil
Core CFC/HCFC - free
rigid phenolic

U-value
(W/m².K)
Kingspan Kooltherm® K12
Framing Board (mm)
0.351,5
60
0.302,5
75
0.272,5
85
Thermal Conductivity
(l-value) - K124     45mm 0.022 W/m.K



1 Based on insulation between timber studs 89 x 38 mm at 600 mm centres. 115 mm plasterboard internal lining, 9 mm OSB sheathing, cavity, brickwork and a 15% framing factor.

2 Assumes minimum 25 mm cavity between insulation and plasterboard. 115 mm plasterboard internal lining, 9 mm OSB sheathing, cavity, blockwork (l¨Cvalue 0.51W/m.k), render finish and a 15% framing factor.

3 Multiple layers required as maximum thickness exceeded. First thickness refers to inner layer, second thickness outer layer. The thermal resistance of the outer layer must be that of the inner layer to avoid condensation.

4 The l-value quoted is in accordance with the Harmonised European Standard BS EN 13166 (phenolic) using so called 90/90 principles. Comparison with alternative products may not be appropriate unless the same procedures have been followed.

5 For the purposes of these calculations the standard of workmanship has been assumed good and therefore the correction factor for air gaps ignored.
FIXING DETAILS
Between Studwork
  • Measure the space between the rafters before cutting the boards as spacings can vary.


  • Ensure accurate trimming to achieve close butting joints and continuity of insulation.


  • In all cases ensure that insulation boards between studs are fitted tightly. Fill any gaps with expanding urethane sealant.


  • To prevent the insulation moving within the timber stud cavity, side nail battens to the studs to provide a ‘stop’ (should coincide with board thickness).


  • Boards should be cut using a sharp knife or a fine toothed saw. To avoid thermal bridging through the timber studs a thermal sheathing specification can be considered (see below).


Insulating Sheathing

  • Insulation boards should be fixed to the external surface of the timber frame structure (outside of the plywood sheathing) restrained in accordance with the timber frame manufacturers recommendations. Please contact the Kingspan Insulation Technical Services Department for further information.


  • Always ensure that fixings are in line with the underlying timber studs, head rails and sole plates.


  • Always ensure boards are close butted and accurately trimmed to achieve continuity of insulation.


  • The foil taping of the board joints is not recommended in this application. Boards should be cut using a sharp knife or a fine toothed saw.