Sloping Insulation For Flat Roofs

Laying flat roof insulation as a rule any roof with a pitch below 10 is classified as a flat roof.

Sloping insulation for flat roofs. A typical interior roof drain assembly occupies about a 4 by 4 square area with a per foot tapered slope. As a general rule if the insulation is 2 thick or less a 4 by 4 is sufficient. Rigid board insulation rigid boa. 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.

Our old flat roof was a bit too flat so the slats actually created a bit more slope where needed. Dual purpose structural deck and insulating planks. The insulation used in low slope roof assemblies typically falls into one of the four categories. According to the louisiana department of natural resources building guide flat or low sloped roofs often demonstrate better energy efficiency because of differences in insulation generally these roofs have a membrane system which is applied on top of sheets of rigid insulation.

There are two types of flat roof. Tapered expanded polystyrene eps roof insulation was developed more than 30 years ago with a dual purpose in mind. 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. Insulation for flat roofing is used to make a structure more energy efficient and minimise heat loss.

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. 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. Lightweight insulating concrete lwic. Or sprayed polyurethane foam spf.

Cold roofs and warm roofs. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. Xps and polyiso are available in boards that are no more than a few inches thick. If the insulation reaches 3 or thicker an 8 by 8 creates a more gradual slope while still providing the necessary momentum.

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. Since the piece of iso is 4 long the thickness increase will be equal to 1 4 times 4 or a rise of 1 over the 4 distance 1 2 to 1 12 flat roofers can then arrange the sloped insulation to move water towards roof drains scuppers or gutters. To drain and insulate dead level roof decks. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.

There is a problem with using these materials though.