Upside Down Roof Insulation

This makes it the only material suitable and approved for inverted roof applications.

Upside down roof insulation.

In it the air vapour barrier and the roofing membrane are combined and located on the structural deck with the insulation placed outside the skin like the fur of animals or the clothing humans wear. Crawlspace insulation installed upside down fiberglass insulation installed backwards diy insulation paper vapor barrier should be facing your interio. You don t say what r value the insulation has but chances are it s adequate for a floor in your climate zone. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast.

In a warm roof construction the principal thermal insulation layer is located above the structural decking. Simplicity of the application of this concept. Also known as a protected membrane or upside down roof inverted roofs employ insulation which can resist water absorption provide excellent thermal performance be unaffected by freeze and thaw cycles withstand surface traffic and be protected from uv and mechanical damage among others. An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation.

This type of roof has normally been used over small extensions to dwellings using timber joists and plywood. An inverted roof also referred to as a protected membrane or upside down roof is form of flat roof in which the waterproofing layer is beneath the thermal insulation rather than above it. Benefits of inverted roofs the great benefit of inverted roofs is that the insulation protects the membrane from extremes of weather such as frost uv exposure and the expansion and contraction that comes about from summer winter temperature cycles which can be as much as 80 c on some roofs. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure.

This doesn t work though if you install the radiant. The waterproofing membrane is protected from extreme thermal stresses high ultraviolet exposure and from mechanical stresses occurring during construction and subsequent use. Flat roof construction thermal design and condensation warm roof. Moisture from inside the house can now accumulate in the insulation which will drastically reduce the r value.

When foil insulation is properly installed the underside of the roof decking remains at or near the ambient temperature even in full sun. Advantages of the upside down roof concept.