Insulation creates a barrier to heat gain and loss in ceilings, roofs, floors, and walls. It is a cost-effective and practical way to keep your house warmer in winter and cooler in summer. It may also reduce condensation, decreasing your chances of damp and mould.

A quarter of heat is lost through the roof in an uninsulated home. Insulating your loft, attic or flat roof is an effective way to reduce heat loss and reduce your heating bills.

The easiest way to insulate your roof is beneath (rather than between) the rafters as you don't need to leave gaps for ventilation. If you're using insulation boards, lay out an outline of where each board is going to go, and if required, cut them down to size.

Proper roof insulation might not be seen in all houses, but it does have advantages. Not only does it prevent unnecessary damage, but it also stops you from racking up serious heating and cooling costs during extreme weather.

Without insulation to regulate temperature and prevent the transfer of heat, the roof is exposed to extreme temperature variations, causing expansion and contraction. These thermal stresses can lead to premature aging and cracking of the roof shingles or tiles, compromising their integrity.

You can use either rigid foam or mineral wool on top of the roof deck. Rigid insulation above the roof deck and air permeable insulation below is a safe way to insulate the top of the house. Be sure to follow the ratio rule, though.