This method of insulating is also suitable for existing buildings where the

tiles/slates need replacing. For this application we recommend the use of either Kingspan Thermapitch TP10 zero ODP (high performance CFC/HCFCfree rigid urethane insulation) or Kingspan Kooltherm K7 Pitched Roof Board (premium performance CFCfree rigid

phenolic insulation).

FIXING DETAILS

Over Rafter Insulation

*A preservative treated stop rail, the thickness of the insulation should be fixed at eaves level. Lay boards either following the rafters or across rafters. The boards should be tightly butted with staggered joints to improve racking performance.

*All joints between the boards running from eaves to ridge must occur over the rafters. There is no necessity to tape board joints.

*Boards can be held in position with counter battens (38 x 38 mm). Secured with Helifix InSkew, Target Skewfast, Wallfast Timfix or similar fixings in accordance with manufacturers guidelines;

Helifix Limited +44 (0) 20 8735 5222

Target Fixings Limited +44 (0) 1344 777 189

Wallfast Limited +44 (0) 23 9265 3330

* Alternatively a sarking board can be overlaid and fixed as above.

Between rafter insulation fitting flush to top of rafter.

* Use nailable sarking clips driven into the upper surface of each rafter at 1 metre centres up the roof slope. The insulation board is then suitably trimmed to size and placed between the rafters using the clips for support.

* In all cases insure that insulation boards are fitted tightly between rafters. Fill any gapswith expanding urethane sealant.

General.

* To prevent a cold bridge, tightly pack flexible insulation material between the rafters and the cavity closer.

*Boards should be cut using a sharp knife or a fine toothed saw.