Hermanus builder:  tips on installing loft / attic insulation

Hermanus builder:  tips on installing loft / attic insulation

Un-insulated lofts account for approximately ¼ of your home’s heat loss through the roof of your home. This in turn costs you money, makes your house colder and wastes valuable energy.

Installing loft insulation is a great energy saving measure that is relatively simple to carry out yourself as it is sold in rolls at your local DIY store. I would recommend 270mm deep insulation at ceiling level to make the most difference, but any depth will retain heat and save you money.


• Try to do this job in winter as most lofts and attics are very unpleasant places to work in the heat of summer!
• Empty out the loft before you begin and ensure that there is adequate lighting installed so that you can see what you are doing.
• If there is debris between the joists this will have to be removed prior to laying the insulation.
• Only roll out the insulation once you are in the loft.
• Keep eyes out for electrical cables as these should be kept above the insulation to prevent them overheating
• Loft insulation is comprised of millions of tiny fibres that can cause severe irritation so ensure that you are wearing a dust mask and gloves and definitely goggles to protect your eyes and preferably some form of protective clothing. Remember to wash this clothing separately afterwards.
• Use 2 or 3 boards to stand on and keep moving them about to where you are working. Do not stand on the ends of the boards or they will tip up….
• Start at the lowest point of your roof and push the roll out. Ensure that you leave a gap of about 5cm along the eaves so that air can still circulate.
• Cut the insulation to the size you require using a Stanley knife or hand saw.
• Lay the insulation between the roof joists and then over them and remember to keep on the joists or you may end up going through the ceiling!
• Because your loft is now insulated it will be colder than before so if your water tank and pipes are not already insulated, they must now be wrapped.

Hermanus builder

If you live in the Hermanus / Walker Bay / Overstrand area and would like your loft insulated for the winter by a professional builder, please contact Donnelly Home Maintenance.