Flat Roof Insulation Details

Hot roofs have the roof deck then insulation then the roofing material.

Flat roof insulation details.

It should be of the maximum available thickness. The rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. No ventilation is required for these types of roofs. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. However in many situations the insulation may need to be primarily or entirely below the flat roof membrane and between the roof joists if so what are the best options. How much ventilation does a flat roof need. Flat roofs have often been built with the insulation all on top of the vapor closed drainage plane as this avoids dew point condensation issues inboard of the roofing.

Rockwool products are available with a bitumen or mineral coated fiberglass face to be used in a number of roofing solutions. It depends on where the insulation is installed. A warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. The answer depends on the type of roof you have.

Any type of roof from tpo to epdm can be either hot or cold. From there the flat roof system you choose will determine the materials you apply. Rockwool stone wool roof insulation combines the thermal performance dimensional stability impact resistance and acoustic control required to increase the performance of many flat roof assemblies. A flat roof usually consists of the following.

Flat roof insulation thickness the chosen insulation laid on top of this should be able to take the weight of anything put above it on the roof without compression or protected from compression by further sheeting. Cold roofs have insulation beneath the roof deck which is beneath the roofing material. Flat roofs are a less common sight in the uk owing to their typically higher maintenance requirements when compared to other forms of roof construction although they can be a versatile form of roof construction. A cold roof or hot roof.

Flat roof insulation installation.