Uninsulated Flat Roof

An uninsulated roof has a u value of approximately 2 5 w m2k however adding insulation can achieve a value of 0 18 w m2k.

Uninsulated flat roof. When you have an un insulated roof you have to live with rather uncomfortable room temperatures inside the. To produce a hot roof rigid insulation is fitted outside above the weatherproofing. The attic had windows at the gable ends but the attic was unfinished. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity.

The typical u value of an existing uninsulated flat roof is 1 5w m2k. The attic was turned into living space. While insulation for a flat roof is expensive and can account for as much as 25 of the total installation cost there are a number of important benefits to having it in place. The target should be to achieve a u value of 0 25w m2k or better.

Insulating your loft attic or flat roof is a simple and effective way to reduce heat loss and reduce your heating bills. In went some skylights on the back side photograph 1 and the rafters got sprayed full of 2 lb ft 3 density spray polyurethane foam spf photograph 2. If your home was built pre 1967 and has an old attic room or loft conversion a great way of achieving this level of insulation is through our specially designed eco roof. The various types of roofs found on homes sheds garages and other buildings fall into one of the following categories.

It was a completely uninsulated and unvented roof. All but the flat roof type have one or more grades built into them allowing water to run off. Gable roofs hip roofs intersecting roofs butterfly roofs mansard roofs gambrel roofs shed roofs and flat roofs. Cold roof a very bad idea.

This is then covered with a further weatherproofing layer. Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.