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.
Retrofit installation pitched roof.
The importance of engineering the new retrofit framing system is hallmark to the overall project.
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.
This system would consist of a base clip variable height post and a purlin system that would create the required positive pitch for a new metal roof panel system says chuck howard pe president of metal roof consultants inc cary n c.
Download the mcelroy metal retrofit roofing guide to learn more.
Mcelroy metal retrofit roofing systems are engineered to adapt to the existing roof s structural support system whether constructed of steel concrete or wood.