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.

Upside down roof insulation.

The so called upside down roof is simply a rearrangement of the normal elements of a roofing system to try and overcome some of the disadvantages of the conventional arrangement. An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation. In a warm roof construction the principal thermal insulation layer is located above the structural decking. This type of roof has normally been used over small extensions to dwellings using timber joists and plywood.

Advantages of the upside down roof concept. The waterproofing membrane is protected from extreme thermal stresses high ultraviolet exposure and from mechanical stresses occurring during construction and subsequent use. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. Simplicity of the application of this concept.

Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure. 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. This doesn t work though if you install the radiant. 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.

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. Crawlspace insulation installed upside down fiberglass insulation installed backwards diy insulation paper vapor barrier should be facing your interio. Flat roof construction thermal design and condensation warm roof. With the insulation upside down the kraft paper is not working as it is intended.

You don t say what r value the insulation has but chances are it s adequate for a floor in your climate zone. This makes it the only material suitable and approved for inverted roof applications.