Hot Roof Design Evaluation

This allows air to circulate.

Hot roof design evaluation.

A good roof pitch would be atleast 30 degrees although traditional vernacular samples may go as high as 45 degrees which i think is better. To do this we designed an unvented hot roof the framing crew erected a structural ridge hand cut 2 8 rafters and sheathed the roof with 5 8 in. Here we used the regular style sheathing rather than insulated r sheathing once the panel seams are taped the roof is dry. A hot roof contains the highest r value because there are no chances for air to leak.

This article describes various solutions for un vented cathedral ceilings and similar under roof spaces offering advice on how to avoid condensation leaks attic mold structural damage when roof venting is not possible. The bigger the r value the better it will insulate your home. A powerful argument can be made for unvented roof construction in hot humid climates in order to control interior moisture. Bonnet roofing systems are basically a mansard roof backwards.

Un vented roof solutions hot roof design problem solutions. The r value measures how well insulation is able to resist heat going through it. The roof needs to withstand weather elements such as rainfall snow strong winds and sunshine. This definition allows simple unvented roof design just don t install vents in a previously recognizable climate zone ashrae s hot humid zone.

As a result this type of roof is known as a cold roof. Flat roofing systems are more appropriate for places that have hot and dry weather. There are examples of bahay kubo with the house to roof ratio of one is to three meaning the height of the walls of the house is one third the height of the roof which makes for very cool interiors since the inhabitants are very far from the. The roof structure above the ceiling is not insulated at all.

However this also allows cold air to enter. The unit of measurement for insulation is called the r value. This is a major structural issue in roof construction. A system most likely to be found in newly built homes.

Likewise referred to as kicked eaves a hood roof has 4 sides with a high top incline as well as a much more mild reduced incline offering cover around the sides of your home for a veranda. The term hot roof is something of a misnomer as the attic space will only be a few degrees warmer than in a traditional roof. Practicality is also enhanced. These roofs have some pros and cons as explained in the article.

A cold roof design usually leaves a 50mm gap between the top of the insulation and the roof deck above. This article series about roof and ceiling ventilation describes. If you live in a rainy region for instance consider having a sloped system which will reduce pooling. Perks of a hot roof.