In an un ventilated roof moist air is passed from the roof construction through the breather membrane out into a ventilated air space formed by counter battens.
Retrofit installation pitched roof.
Download the mcelroy metal retrofit roofing guide to learn more.
These new roofs can be either low sloped less than 2 12 functional roofs or high pitched greater than 2 12 architectural roofs depending on the expectations of the building owner.
U value target u values normally achievable for the rafter level insulation of a pitched roof are between 0 20 0 16 w m2k depending on existing rafter depth and available space.
The importance of engineering the new retrofit framing system is hallmark to the overall project.
Mcelroy metal retrofit roofing systems are engineered to adapt to the existing roof s structural support system whether constructed of steel concrete or wood.