Flat Roof Insulation Requirements

A note to consider before construction.

Flat roof insulation requirements.

Insulation is placed in between the joists underneath the roof surface above. Consider geography budget and use for the roof to determine the best option. Any type of roof from tpo to epdm can be either hot or cold. If insulation is installed below the flat roof deck this is called a cold roof.

Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc 2004 2007 2010 2013 2016 2009 2011 2014 2012 2015 2009 2012 2015 0 25 1 15 20 2 15 20 25 3 15 20 25 4 15 20 302535 5 15 20 302535 6 15 20 3035 7 15 20 3540 25 8 20 3540 25 minimum r value non residential above roof deck. Both these variants require different approaches to insulation which will be covered in this guide. Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used. Different types of roofing insulation exist including blanket insulation blown insulation and rigid insulation.

The type that is right for your flat roof insulation job depends upon the state of the roof expert opinion on the best type and your budget. There are two types of flat roof. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same.

With a flat roof however this becomes a major concern. Cold roofs and warm roofs. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation.

Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. A cold roof or hot roof. The answer depends on the type of roof you have. There are many different types and installation methods out there along with a lot misinformation about which products offer the greatest energy savings.

How much ventilation does a flat roof need. Roofing insulation is one of the most important and misunderstood building components. Cold roofs have insulation beneath the. From there the flat roof system you choose will determine the materials you apply.

It depends on where the insulation is installed.