Over the past few months SIG Roofing Supplies Group have strengthened their partnership with Kingspan Insulation and invested in pitched roof insulation. This is a growing market and SIG are keen to provide contractors with the necessary products and services to meet this demand. Branches have been taking in more stock of Kingspan Thermapitch TP10 zero ODP and have supporting literature, free samples and posters to provide customers with all the technical information on the product. Branch staff have also been specially trained to help provide advice on issues like U-Values and Part L Regulations.

Free Kingspan Insulation giveaways have also been sent to the branches, so hurry into your nearest branch to pick up a free gift and discuss your next project.

Step By Step Guide To Installation of Between And Under Rafter Insulation

Between Rafter Insulation (Partially Filled Rafters)

To maintain the required void above the insulation and to ensure the boards are flush with the bottom of the rafters, side-nail the battens to the rafters in the appropriate position to provide a ‘stop’.

The void must be 50 mm deep and ventilated for constructions that don’t use a breathable sarking membrane. Ventilation should be provided in accordance with Approved Document F, F2 (Condensation in Roofs) or the Building Regulations or Technical Standard K (Ventilation of Buildings, Regulation 23) of the Building Standards (Scotland).

Between Rafter Insulation (Fully Filled Rafters)

Measure the space between the rafters before cutting the boards as spacings can vary.

Cut the Kingspan Thermapitch TP10 zero ODP insulation boards to size using a sharp knife or fine toothed saw.

Install the correct thickness of insulation in such a manner that it’s flush with the bottom of the rafters but doesn’t fill the rafter depth. In all cases insure that insulation boards between rafters are fitted tightly.

Fill any gaps with expanding urethane sealant.
1. Measure the space between the rafters before cutting the boards as spacings do vary.
2. Cut the Kingspan Thermapitch TP10 zero ODP insulation boards to size using a sharp knife or fine toothed saw.
3. Install the correct thickness of insulation in such a manner that makes it flush with the bottom of the rafters but does not fill the rafter depth. In all cases insure that insulation boards between rafters are fitted tightly.
4. Fill any gaps with expanding urethane sealant.

Under Rafter Insulation

1. Measure up before cutting the boards. Cut the Kingspan Thermawall TW56 zero ODP insulation boards to size using a sharp knife or fine toothed saw.
2. Where board dimensions allow, fix the boards at right angles to the underside of the rafters.
3. Boards should be fixed with galvanised clout nails or drywall timber screws, long enough to allow 25mm penetration of the timber. These should be placed at 150 mm centres and no less than 10 mm from the edges of the board along all supporting edges.

General

Ensure accurate trimming to achieve close butting joints and continuity of insulation. Ensure the continuity of the
insulation at the ridge. To prevent a cold bridge, tightly pack flexible insulation material between the rafters and the cavity closer.

SIG Roofing Supplies Group recommends that you always follow manufacturers guidelines.