Under the existing roof sheet

• At survey stage ensure liner can be fitted under the roof sheets
• Ensure the roof fixings are in good condition and suitable for use
• Remove or loosen the bottom row of roof fixings, ensure the liner goes under the roof sheet and above the holes were the fixings have been removed
• Eaves fillers may need to be removed. Replace after the liner is in place. (reseal if required)
• Replace or tighten the fixings to trap the liner