IKO enertherm MG on a hall roof: handing over insulation before waterproofing

Mark the area that can be insulated, inspected and made weathertight that day. Working around a rooflight usually involves more cutting than covering the same area in the middle of the roof. Plan access to the next section so materials do not have to cross the area handed over to the roofers.

IKO enertherm MG has a PIR core faced on both sides with perforated, coated glass fleece. Check the MG designation, thickness and delivery reference on the label. The data sheet gives reaction to fire class E and at least 150 kPa in compression at 10% deformation. Permissible roof loads depend on the structural design and complete roof build-up.

The MG data sheet gives a declared thermal conductivity of 0.026 W/(m·K) below 120 mm thickness and 0.025 W/(m·K) from 120 mm. The declared resistance is 3.80 m²K/W for a 100 mm board and 4.80 m²K/W for a 120 mm board. Use the entry for the actual thickness supplied.

In this example, the extra 20 mm increases the declared resistance of the board by 1.00 m²K/W. A thickness change on site also calls for a check of flashing heights and rooflight kerb details. Calculate the roof U-value using the specified layers and applicable corrections.

Specify the membrane and the attachment method. For a bonded system, confirm compatibility of the particular adhesive with the MG facing and the underside of the membrane, along with application conditions. For mechanical fixing, the crew needs the specified fixing pattern and details of the deck into which the fasteners anchor.

Walk the area with the waterproofing installer. Look for torn fleece, loose corners, signs of moisture and debris from cutting. Mark areas that need a decision or replacement, then inspect them after remedial work. Release the area for waterproofing once it meets the requirements of the selected system.

Before leaving the roof, check temporary weather protection at the work boundary and close the access route to other trades. In the morning, inspect edges where water could have entered beneath the boards. A dry top face alone does not establish that the lower layers are dry. Mark any suspect area for investigation before covering it.

Record the hall grid lines defining the area, the inspection date and time, MG thickness, membrane reference and agreed attachment method. Attach location-labelled photographs of repairs and identify the part actually covered that day. During a later repair, the team can then reconstruct the work sequence around a particular roof penetration.