Why Not Put Insulation Under The Roof

The percentage of your home s heat that is lost through the roof is on average around 40 percent.

Why not put insulation under the roof.

Given a certain amount of insulation being used for a tight house uniform distribution throughout all parts of the shell exposed to the outside air in general does give minimum heat loss. Moreover you lose less space. This language is in both the residential and commercial codes. For the same reason insulation shouldn t touch the roof s underside.

The problem arises with moisture. Remember to fit a damp proof membrane if you go with mineral wool. The moisture is held in place by the insulation which allows for damage to the framing and other building components. The material is compressible and is thus easy to fit and is less likely to cause cracks.

Insulation should go up the side and over any tanks or special tank insulation can be used but you mustn t insulate under any tanks as without some heat flowing up from below these are also. The insulation boards are best fitted under the roof structure whilst the mineral wool can be inserted between the beams of the roof. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense.

This piece originally the quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies. This is an extremely large amount of heat that is exiting the building and leaving you and the other residents of the building feeling cold and vulnerable in the chillier months or climates. The problem with the insulation against the sheathing expands. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

Proper insulation can significantly reduce your energy consumption heat in the winter ac in the summer and reduce your energy costs by hundreds of dollars a year. A roof without good insulation is a great contributor to energy loss. Consider an extreme example in which all of the attic floor insulation is piled up on half the area giving very very high r value there but none elsewhere.