Why Not Put Insulation Under The Roof

For the same reason insulation shouldn t touch the roof s underside.

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. This is bad for the environment and for your wallet as you end up spending a lot more on your electric bills. If there is a roof leak the insulation will be damaged by the water leaving you with less insulating value. The insulation boards are best fitted under the roof structure whilst the mineral wool can be inserted between the beams of the roof.

Moreover you lose less space. The moisture is held in place by the insulation which allows for damage to the framing and other building components. This language is in both the residential and commercial codes. 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.

Remember to fit a damp proof membrane if you go with mineral wool. 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. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. The problem with the insulation against the sheathing expands.

A roof without good insulation is a great contributor to energy loss. 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. The material is compressible and is thus easy to fit and is less likely to cause cracks. 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.

The problem arises with moisture. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. 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.