Sloping Insulation For Flat Roofs

To drain and insulate dead level roof decks.

Sloping insulation for flat roofs.

There are two types of flat roof. Our old flat roof was a bit too flat so the slats actually created a bit more slope where needed. Insulation for flat roofing is used to make a structure more energy efficient and minimise heat loss. A typical interior roof drain assembly occupies about a 4 by 4 square area with a per foot tapered slope.

Insulation makes the difference in flat roofs. The traditional fix is labor intensive creating a positive slope roof is traditionally done by installing rigid board insulation such as xps or polyiso on flat or low sloped roofs. Some of these roofs have parapets perhaps on just one side of the roof or perhaps on three or four while others have no parapets at all. Manufactured from lightweight foam control eps tapered expanded polystyrene eps roof insulation is a value engineered system that has been proven in new and reroof applications all over the country.

In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. The insulation is under the sheathing because torching down onto insulation is probably not a great idea nor is walking on a torched down roofing material that is directly on top of relatively soft foam. Tapered expanded polystyrene eps roof insulation was developed more than 30 years ago with a dual purpose in mind. This type of roof is common in urban areas for example on triple deckers in boston and row houses in philadelphia as well as in the southwest.

There is a problem with using these materials though. Or sprayed polyurethane foam spf. It s a roof that is flat or almost flat. Cold roofs and warm roofs.

There are many options available to fulfil this requirement as you will find out below. Rigid board insulation rigid boa. Xps and polyiso are available in boards that are no more than a few inches thick. Lightweight insulating concrete lwic.

As a general rule if the insulation is 2 thick or less a 4 by 4 is sufficient. The insulation used in low slope roof assemblies typically falls into one of the four categories. Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.

If the insulation reaches 3 or thicker an 8 by 8 creates a more gradual slope while still providing the necessary momentum.