Inverted Flat Roof System

What is an inverted roof.

Inverted flat roof system. Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation. Invented by dow in the late 1960 s an inverted roof system uses dupont styrofoam brand xps insulation to protect the membrane helping improve the performance and longevity of the entire roof system. Simply defined as a type of roof construction where the waterproofing layer lies beneath the insulation instead of above it as in other forms of roofing inverted roofs ensure that the complete roof construction including roof covering is kept at warm temperatures during winter months and at moderate temperates during the summer months. Inverted roof systems a variation of a warm roof.

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 draining away. This makes it the only material suitable and approved for inverted roof applications. The mariseal system inverted flat roof waterproofing method offers a simple build up waterproofing that features a protected waterproofing membrane and loose laying insulation boards. 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.

Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. Inverted flat roof waterproofing combined with a thermal insulation is essential for a buildings waterproofing and energy saving thermal insulation. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure. The main difference between inverted roof systems and other roof systems is in the position of the waterproofing membrane.