Inverted Concrete Roof

In an inverted roof construction the sika trocal membrane is installed directly to the structural decking usually concrete and the innobond thermal insulation is installed on top of the membrane.

Inverted concrete roof.

This is achieved by placing isoboard extruded polystyrene insulation board above instead of below the waterproofing membrane. Inverted roofs have their waterproofing layer beneath the insulation instead of above it as in other forms of roofing. This means that the insulation should be highly resistant to water absorption for example an extruded polystyrene based product which will not be affected by water or repeated freeze thaw cycles. Inverted roof internal to external roof build up.

On top of the waterproofing layer sikatherm insulation xps is installed. Inverted warm roof concrete deck not suitable for slopes greater than 10 ballast. The green guide informs breeam ratings and here the biggest additional contribution will be the iso 14001 certification for the manufacture of the waterproofing and the insulation. Most of the inverted roof insulation boards have an a or a rating but as an inverted roof is usually on a concrete deck the overall rating will be c or d.

In this issue the investigations team explains how inverted roofs work outlines their benefits warns of a possible cause of problems and describes an unusual investigation. 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. The waterproofing layer is typically a liquid applied membrane above a concrete roof slab. Ballast should consist of paving slabs or of rounded pebbles of minimum diameter 19mm to the depth specified in the design.

Then aquazone a high performance non woven polyethylene membrane is installed over the insulation to minimise the cooling effect associated with rainwater flowing down through the insulation and. Geo textile layer laid over insulation boards to prevent fines from reaching the membrane surface. Now that we understand what an inverted roof is and some of the benefits we ve put together a listed build up to help make designing your roof that bit simpler. Inverted roof upside down roof in an inverted roof construction the principal thermal insulation layer is located not only above the roof structure but also above the waterproofing resulting in the waterproofing structural deck and support structure being at a temperature close to that of the interior of the building.

Inverted roofs are a type of warm flat roof where the insulation is above the waterproofing layer. Then sarnatherm aquazone a high performance non woven polyethylene membrane is installed.